diff --git a/Cargo.lock b/Cargo.lock
index 9433aafaff..f5f7820ca7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4943,7 +4943,7 @@ name = "solana-account-decoder"
 version = "1.16.0"
 dependencies = [
  "Inflector",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bs58",
  "bv",
@@ -5372,7 +5372,7 @@ name = "solana-cli-output"
 version = "1.16.0"
 dependencies = [
  "Inflector",
- "base64 0.13.1",
+ "base64 0.21.0",
  "chrono",
  "clap 2.33.3",
  "console",
@@ -5502,7 +5502,7 @@ dependencies = [
 name = "solana-core"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bs58",
  "chrono",
@@ -5760,7 +5760,7 @@ dependencies = [
 name = "solana-genesis"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "clap 2.33.3",
  "itertools",
@@ -6338,7 +6338,7 @@ dependencies = [
  "ark-serialize 0.4.2",
  "array-bytes",
  "assert_matches",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bitflags",
  "blake3",
@@ -6388,7 +6388,7 @@ dependencies = [
 name = "solana-program-runtime"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "eager",
  "enum-iterator",
@@ -6417,7 +6417,7 @@ version = "1.16.0"
 dependencies = [
  "assert_matches",
  "async-trait",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "chrono-humanize",
  "crossbeam-channel",
@@ -6520,7 +6520,7 @@ dependencies = [
 name = "solana-rpc"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bs58",
  "crossbeam-channel",
@@ -6579,7 +6579,7 @@ version = "1.16.0"
 dependencies = [
  "assert_matches",
  "async-trait",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bs58",
  "crossbeam-channel",
@@ -6606,7 +6606,7 @@ dependencies = [
 name = "solana-rpc-client-api"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bs58",
  "jsonrpc-core",
  "reqwest",
@@ -6799,7 +6799,7 @@ version = "1.16.0"
 dependencies = [
  "anyhow",
  "assert_matches",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bitflags",
  "borsh",
@@ -7046,7 +7046,7 @@ dependencies = [
 name = "solana-test-validator"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "crossbeam-channel",
  "log",
@@ -7173,7 +7173,7 @@ name = "solana-transaction-status"
 version = "1.16.0"
 dependencies = [
  "Inflector",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "borsh",
  "bs58",
@@ -7392,7 +7392,7 @@ version = "1.16.0"
 dependencies = [
  "aes-gcm-siv",
  "arrayref",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bytemuck",
  "byteorder",
diff --git a/Cargo.toml b/Cargo.toml
index 5d7c84b1aa..4ecc4db115 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -138,7 +138,7 @@ async-mutex = "1.4.0"
 async-trait = "0.1.68"
 atty = "0.2.11"
 backoff = "0.4.0"
-base64 = "0.13.1"
+base64 = "0.21.0"
 bincode = "1.3.3"
 bitflags = "1.3.1"
 blake3 = "1.3.3"
diff --git a/account-decoder/src/lib.rs b/account-decoder/src/lib.rs
index 0fb64d947a..b0f52c8d01 100644
--- a/account-decoder/src/lib.rs
+++ b/account-decoder/src/lib.rs
@@ -18,6 +18,7 @@ pub mod validator_info;
 
 use {
     crate::parse_account_data::{parse_account_data, AccountAdditionalData, ParsedAccount},
+    base64::{prelude::BASE64_STANDARD, Engine},
     solana_sdk::{
         account::{ReadableAccount, WritableAccount},
         clock::Epoch,
@@ -95,7 +96,7 @@ impl UiAccount {
                 UiAccountData::Binary(data, encoding)
             }
             UiAccountEncoding::Base64 => UiAccountData::Binary(
-                base64::encode(slice_data(account.data(), data_slice_config)),
+                BASE64_STANDARD.encode(slice_data(account.data(), data_slice_config)),
                 encoding,
             ),
             UiAccountEncoding::Base64Zstd => {
@@ -104,9 +105,11 @@ impl UiAccount {
                     .write_all(slice_data(account.data(), data_slice_config))
                     .and_then(|()| encoder.finish())
                 {
-                    Ok(zstd_data) => UiAccountData::Binary(base64::encode(zstd_data), encoding),
+                    Ok(zstd_data) => {
+                        UiAccountData::Binary(BASE64_STANDARD.encode(zstd_data), encoding)
+                    }
                     Err(_) => UiAccountData::Binary(
-                        base64::encode(slice_data(account.data(), data_slice_config)),
+                        BASE64_STANDARD.encode(slice_data(account.data(), data_slice_config)),
                         UiAccountEncoding::Base64,
                     ),
                 }
@@ -118,7 +121,7 @@ impl UiAccount {
                     UiAccountData::Json(parsed_data)
                 } else {
                     UiAccountData::Binary(
-                        base64::encode(slice_data(account.data(), data_slice_config)),
+                        BASE64_STANDARD.encode(slice_data(account.data(), data_slice_config)),
                         UiAccountEncoding::Base64,
                     )
                 }
@@ -140,14 +143,16 @@ impl UiAccount {
             UiAccountData::LegacyBinary(blob) => bs58::decode(blob).into_vec().ok(),
             UiAccountData::Binary(blob, encoding) => match encoding {
                 UiAccountEncoding::Base58 => bs58::decode(blob).into_vec().ok(),
-                UiAccountEncoding::Base64 => base64::decode(blob).ok(),
-                UiAccountEncoding::Base64Zstd => base64::decode(blob).ok().and_then(|zstd_data| {
-                    let mut data = vec![];
-                    zstd::stream::read::Decoder::new(zstd_data.as_slice())
-                        .and_then(|mut reader| reader.read_to_end(&mut data))
-                        .map(|_| data)
-                        .ok()
-                }),
+                UiAccountEncoding::Base64 => BASE64_STANDARD.decode(blob).ok(),
+                UiAccountEncoding::Base64Zstd => {
+                    BASE64_STANDARD.decode(blob).ok().and_then(|zstd_data| {
+                        let mut data = vec![];
+                        zstd::stream::read::Decoder::new(zstd_data.as_slice())
+                            .and_then(|mut reader| reader.read_to_end(&mut data))
+                            .map(|_| data)
+                            .ok()
+                    })
+                }
                 UiAccountEncoding::Binary | UiAccountEncoding::JsonParsed => None,
             },
         }?;
diff --git a/account-decoder/src/parse_bpf_loader.rs b/account-decoder/src/parse_bpf_loader.rs
index 44be1c1912..df9208bc29 100644
--- a/account-decoder/src/parse_bpf_loader.rs
+++ b/account-decoder/src/parse_bpf_loader.rs
@@ -3,6 +3,7 @@ use {
         parse_account_data::{ParsableAccount, ParseAccountError},
         UiAccountData, UiAccountEncoding,
     },
+    base64::{prelude::BASE64_STANDARD, Engine},
     bincode::{deserialize, serialized_size},
     solana_sdk::{bpf_loader_upgradeable::UpgradeableLoaderState, pubkey::Pubkey},
 };
@@ -27,7 +28,7 @@ pub fn parse_bpf_upgradeable_loader(
             BpfUpgradeableLoaderAccountType::Buffer(UiBuffer {
                 authority: authority_address.map(|pubkey| pubkey.to_string()),
                 data: UiAccountData::Binary(
-                    base64::encode(&data[offset..]),
+                    BASE64_STANDARD.encode(&data[offset..]),
                     UiAccountEncoding::Base64,
                 ),
             })
@@ -51,7 +52,7 @@ pub fn parse_bpf_upgradeable_loader(
                 slot,
                 authority: upgrade_authority_address.map(|pubkey| pubkey.to_string()),
                 data: UiAccountData::Binary(
-                    base64::encode(&data[offset..]),
+                    BASE64_STANDARD.encode(&data[offset..]),
                     UiAccountEncoding::Base64,
                 ),
             })
@@ -115,7 +116,10 @@ mod test {
             parse_bpf_upgradeable_loader(&account_data).unwrap(),
             BpfUpgradeableLoaderAccountType::Buffer(UiBuffer {
                 authority: Some(authority.to_string()),
-                data: UiAccountData::Binary(base64::encode(&program), UiAccountEncoding::Base64),
+                data: UiAccountData::Binary(
+                    BASE64_STANDARD.encode(&program),
+                    UiAccountEncoding::Base64
+                ),
             })
         );
 
@@ -130,7 +134,10 @@ mod test {
             parse_bpf_upgradeable_loader(&account_data).unwrap(),
             BpfUpgradeableLoaderAccountType::Buffer(UiBuffer {
                 authority: None,
-                data: UiAccountData::Binary(base64::encode(&program), UiAccountEncoding::Base64),
+                data: UiAccountData::Binary(
+                    BASE64_STANDARD.encode(&program),
+                    UiAccountEncoding::Base64
+                ),
             })
         );
 
@@ -159,7 +166,10 @@ mod test {
             BpfUpgradeableLoaderAccountType::ProgramData(UiProgramData {
                 slot,
                 authority: Some(authority.to_string()),
-                data: UiAccountData::Binary(base64::encode(&program), UiAccountEncoding::Base64),
+                data: UiAccountData::Binary(
+                    BASE64_STANDARD.encode(&program),
+                    UiAccountEncoding::Base64
+                ),
             })
         );
 
@@ -174,7 +184,10 @@ mod test {
             BpfUpgradeableLoaderAccountType::ProgramData(UiProgramData {
                 slot,
                 authority: None,
-                data: UiAccountData::Binary(base64::encode(&program), UiAccountEncoding::Base64),
+                data: UiAccountData::Binary(
+                    BASE64_STANDARD.encode(&program),
+                    UiAccountEncoding::Base64
+                ),
             })
         );
     }
diff --git a/cli-output/src/cli_output.rs b/cli-output/src/cli_output.rs
index bd8beeb0ac..cf7fe3d274 100644
--- a/cli-output/src/cli_output.rs
+++ b/cli-output/src/cli_output.rs
@@ -9,6 +9,7 @@ use {
         },
         QuietDisplay, VerboseDisplay,
     },
+    base64::{prelude::BASE64_STANDARD, Engine},
     chrono::{Local, TimeZone},
     clap::ArgMatches,
     console::{style, Emoji},
@@ -2400,7 +2401,7 @@ pub fn return_signers_data(tx: &Transaction, config: &ReturnSignersConfig) -> Cl
         });
     let message = if config.dump_transaction_message {
         let message_data = tx.message_data();
-        Some(base64::encode(message_data))
+        Some(BASE64_STANDARD.encode(message_data))
     } else {
         None
     };
diff --git a/cli-output/src/display.rs b/cli-output/src/display.rs
index 66aa116d21..d2fa3947cb 100644
--- a/cli-output/src/display.rs
+++ b/cli-output/src/display.rs
@@ -1,5 +1,6 @@
 use {
     crate::cli_output::CliSignatureVerificationStatus,
+    base64::{prelude::BASE64_STANDARD, Engine},
     chrono::{DateTime, Local, NaiveDateTime, SecondsFormat, TimeZone, Utc},
     console::style,
     indicatif::{ProgressBar, ProgressStyle},
@@ -602,7 +603,7 @@ fn write_return_data<W: io::Write>(
     if let Some(return_data) = return_data {
         let (data, encoding) = &return_data.data;
         let raw_return_data = match encoding {
-            UiReturnDataEncoding::Base64 => base64::decode(data).map_err(|err| {
+            UiReturnDataEncoding::Base64 => BASE64_STANDARD.decode(data).map_err(|err| {
                 io::Error::new(
                     io::ErrorKind::Other,
                     format!("could not parse data as {encoding:?}: {err:?}"),
diff --git a/genesis/src/main.rs b/genesis/src/main.rs
index 043fd0e291..fb6b3de347 100644
--- a/genesis/src/main.rs
+++ b/genesis/src/main.rs
@@ -2,6 +2,7 @@
 #![allow(clippy::integer_arithmetic)]
 
 use {
+    base64::{prelude::BASE64_STANDARD, Engine},
     clap::{crate_description, crate_name, value_t, value_t_or_exit, App, Arg, ArgMatches},
     itertools::Itertools,
     solana_clap_utils::{
@@ -87,12 +88,14 @@ pub fn load_genesis_accounts(file: &str, genesis_config: &mut GenesisConfig) ->
         let mut account = AccountSharedData::new(account_details.balance, 0, &owner_program_id);
         if account_details.data != "~" {
             account.set_data(
-                base64::decode(account_details.data.as_str()).map_err(|err| {
-                    io::Error::new(
-                        io::ErrorKind::Other,
-                        format!("Invalid account data: {}: {:?}", account_details.data, err),
-                    )
-                })?,
+                BASE64_STANDARD
+                    .decode(account_details.data.as_str())
+                    .map_err(|err| {
+                        io::Error::new(
+                            io::ErrorKind::Other,
+                            format!("Invalid account data: {}: {:?}", account_details.data, err),
+                        )
+                    })?,
             );
         }
         account.set_executable(account_details.executable);
@@ -784,7 +787,7 @@ mod tests {
 
                 assert_eq!(
                     b64_account.data,
-                    base64::encode(&genesis_config.accounts[&pubkey].data)
+                    BASE64_STANDARD.encode(&genesis_config.accounts[&pubkey].data)
                 );
             }
         }
@@ -868,7 +871,7 @@ mod tests {
 
             assert_eq!(
                 b64_account.data,
-                base64::encode(&genesis_config.accounts[&pubkey].data),
+                BASE64_STANDARD.encode(&genesis_config.accounts[&pubkey].data),
             );
         }
 
@@ -952,7 +955,7 @@ mod tests {
 
             assert_eq!(
                 b64_account.data,
-                base64::encode(&genesis_config.accounts[&pubkey].data),
+                BASE64_STANDARD.encode(&genesis_config.accounts[&pubkey].data),
             );
         }
 
@@ -977,7 +980,7 @@ mod tests {
 
             assert_eq!(
                 genesis_accounts2[&keypair_str].data,
-                base64::encode(&genesis_config.accounts[&pubkey].data),
+                BASE64_STANDARD.encode(&genesis_config.accounts[&pubkey].data),
             );
         });
     }
diff --git a/program-runtime/src/stable_log.rs b/program-runtime/src/stable_log.rs
index 7633e640df..9ba7542e9c 100644
--- a/program-runtime/src/stable_log.rs
+++ b/program-runtime/src/stable_log.rs
@@ -4,6 +4,7 @@
 //! of program logging
 use {
     crate::{ic_logger_msg, log_collector::LogCollector},
+    base64::{prelude::BASE64_STANDARD, Engine},
     itertools::Itertools,
     solana_sdk::pubkey::Pubkey,
     std::{cell::RefCell, rc::Rc},
@@ -55,7 +56,7 @@ pub fn program_data(log_collector: &Option<Rc<RefCell<LogCollector>>>, data: &[&
     ic_logger_msg!(
         log_collector,
         "Program data: {}",
-        data.iter().map(base64::encode).join(" ")
+        data.iter().map(|v| BASE64_STANDARD.encode(v)).join(" ")
     );
 }
 
@@ -78,7 +79,7 @@ pub fn program_return(
         log_collector,
         "Program return: {} {}",
         program_id,
-        base64::encode(data)
+        BASE64_STANDARD.encode(data)
     );
 }
 
diff --git a/program-test/src/lib.rs b/program-test/src/lib.rs
index 43d8dc7e71..9a610a11b4 100644
--- a/program-test/src/lib.rs
+++ b/program-test/src/lib.rs
@@ -5,6 +5,7 @@
 pub use tokio;
 use {
     async_trait::async_trait,
+    base64::{prelude::BASE64_STANDARD, Engine},
     chrono_humanize::{Accuracy, HumanTime, Tense},
     log::*,
     solana_banks_client::start_client,
@@ -562,7 +563,8 @@ impl ProgramTest {
             address,
             Account {
                 lamports,
-                data: base64::decode(data_base64)
+                data: BASE64_STANDARD
+                    .decode(data_base64)
                     .unwrap_or_else(|err| panic!("Failed to base64 decode: {err}")),
                 owner,
                 executable: false,
diff --git a/programs/sbf/Cargo.lock b/programs/sbf/Cargo.lock
index ba00629054..4a2941a974 100644
--- a/programs/sbf/Cargo.lock
+++ b/programs/sbf/Cargo.lock
@@ -4499,7 +4499,7 @@ name = "solana-account-decoder"
 version = "1.16.0"
 dependencies = [
  "Inflector",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bs58",
  "bv",
@@ -4680,7 +4680,7 @@ name = "solana-cli-output"
 version = "1.16.0"
 dependencies = [
  "Inflector",
- "base64 0.13.1",
+ "base64 0.21.0",
  "chrono",
  "clap 2.33.3",
  "console",
@@ -4774,7 +4774,7 @@ dependencies = [
 name = "solana-core"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bs58",
  "chrono",
@@ -5310,7 +5310,7 @@ dependencies = [
  "ark-ff 0.4.2",
  "ark-serialize 0.4.2",
  "array-bytes",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bitflags",
  "blake3",
@@ -5358,7 +5358,7 @@ dependencies = [
 name = "solana-program-runtime"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "eager",
  "enum-iterator",
@@ -5386,7 +5386,7 @@ version = "1.16.0"
 dependencies = [
  "assert_matches",
  "async-trait",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "chrono-humanize",
  "crossbeam-channel",
@@ -5483,7 +5483,7 @@ dependencies = [
 name = "solana-rpc"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bs58",
  "crossbeam-channel",
@@ -5537,7 +5537,7 @@ name = "solana-rpc-client"
 version = "1.16.0"
 dependencies = [
  "async-trait",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bs58",
  "indicatif",
@@ -5560,7 +5560,7 @@ dependencies = [
 name = "solana-rpc-client-api"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bs58",
  "jsonrpc-core",
  "reqwest",
@@ -6098,7 +6098,7 @@ name = "solana-sdk"
 version = "1.16.0"
 dependencies = [
  "assert_matches",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bitflags",
  "borsh",
@@ -6304,7 +6304,7 @@ dependencies = [
 name = "solana-test-validator"
 version = "1.16.0"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "crossbeam-channel",
  "log",
@@ -6370,7 +6370,7 @@ name = "solana-transaction-status"
 version = "1.16.0"
 dependencies = [
  "Inflector",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "borsh",
  "bs58",
@@ -6547,7 +6547,7 @@ version = "1.16.0"
 dependencies = [
  "aes-gcm-siv",
  "arrayref",
- "base64 0.13.1",
+ "base64 0.21.0",
  "bincode",
  "bytemuck",
  "byteorder 1.4.3",
diff --git a/rpc-client/src/mock_sender.rs b/rpc-client/src/mock_sender.rs
index 5664c1be3f..cee12e8689 100644
--- a/rpc-client/src/mock_sender.rs
+++ b/rpc-client/src/mock_sender.rs
@@ -3,6 +3,7 @@
 use {
     crate::rpc_sender::*,
     async_trait::async_trait,
+    base64::{prelude::BASE64_STANDARD, Engine},
     serde_json::{json, Number, Value},
     solana_account_decoder::{UiAccount, UiAccountEncoding},
     solana_rpc_client_api::{
@@ -335,7 +336,7 @@ impl RpcSender for MockSender {
                     Signature::new(&[8; 64]).to_string()
                 } else {
                     let tx_str = params.as_array().unwrap()[0].as_str().unwrap().to_string();
-                    let data = base64::decode(tx_str).unwrap();
+                    let data = BASE64_STANDARD.decode(tx_str).unwrap();
                     let tx: Transaction = bincode::deserialize(&data).unwrap();
                     tx.signatures[0].to_string()
                 };
diff --git a/rpc-client/src/nonblocking/rpc_client.rs b/rpc-client/src/nonblocking/rpc_client.rs
index 4a55d1b69a..21350938a7 100644
--- a/rpc-client/src/nonblocking/rpc_client.rs
+++ b/rpc-client/src/nonblocking/rpc_client.rs
@@ -24,6 +24,7 @@ use {
         },
         rpc_sender::*,
     },
+    base64::{prelude::BASE64_STANDARD, Engine},
     bincode::serialize,
     log::*,
     serde_json::{json, Value},
@@ -5387,7 +5388,7 @@ where
         .map_err(|e| ClientErrorKind::Custom(format!("Serialization failed: {e}")))?;
     let encoded = match encoding {
         UiTransactionEncoding::Base58 => bs58::encode(serialized).into_string(),
-        UiTransactionEncoding::Base64 => base64::encode(serialized),
+        UiTransactionEncoding::Base64 => BASE64_STANDARD.encode(serialized),
         _ => {
             return Err(ClientErrorKind::Custom(format!(
                 "unsupported encoding: {encoding}. Supported encodings: base58, base64"
diff --git a/rpc/src/rpc.rs b/rpc/src/rpc.rs
index f555d87cbd..8854af9f93 100644
--- a/rpc/src/rpc.rs
+++ b/rpc/src/rpc.rs
@@ -5,6 +5,7 @@ use {
         max_slots::MaxSlots, optimistically_confirmed_bank_tracker::OptimisticallyConfirmedBank,
         parsed_token_accounts::*, rpc_cache::LargestAccountsCache, rpc_health::*,
     },
+    base64::{prelude::BASE64_STANDARD, Engine},
     bincode::{config::Options, serialize},
     crossbeam_channel::{unbounded, Receiver, Sender},
     jsonrpc_core::{futures::future, types::error, BoxFuture, Error, Metadata, Result},
@@ -4484,7 +4485,8 @@ where
                     PACKET_DATA_SIZE,
                 )));
             }
-            base64::decode(encoded)
+            BASE64_STANDARD
+                .decode(encoded)
                 .map_err(|e| Error::invalid_params(format!("invalid base64 encoding: {e:?}")))?
         }
     };
@@ -5537,7 +5539,7 @@ pub mod tests {
             Some(json!([address, {"encoding": "base64"}])),
         );
         let result: Value = parse_success_result(rpc.handle_request_sync(request));
-        let expected = json!([base64::encode(&data), "base64"]);
+        let expected = json!([BASE64_STANDARD.encode(&data), "base64"]);
         assert_eq!(result["value"]["data"], expected);
         assert_eq!(result["value"]["space"], 5);
 
@@ -5546,7 +5548,7 @@ pub mod tests {
             Some(json!([address, {"encoding": "base64", "dataSlice": {"length": 2, "offset": 1}}])),
         );
         let result: Value = parse_success_result(rpc.handle_request_sync(request));
-        let expected = json!([base64::encode(&data[1..3]), "base64"]);
+        let expected = json!([BASE64_STANDARD.encode(&data[1..3]), "base64"]);
         assert_eq!(result["value"]["data"], expected);
         assert_eq!(result["value"]["space"], 5);
 
@@ -5566,7 +5568,7 @@ pub mod tests {
             ),
         );
         let result: Value = parse_success_result(rpc.handle_request_sync(request));
-        let expected = json!([base64::encode(&data[1..3]), "base64"]);
+        let expected = json!([BASE64_STANDARD.encode(&data[1..3]), "base64"]);
         assert_eq!(
             result["value"]["data"], expected,
             "should use data slice if parsing fails"
@@ -5608,7 +5610,7 @@ pub mod tests {
             {
                 "owner": "11111111111111111111111111111111",
                 "lamports": 42,
-                "data": [base64::encode(&data), "base64"],
+                "data": [BASE64_STANDARD.encode(&data), "base64"],
                 "executable": false,
                 "rentEpoch": 0,
                 "space": 5,
@@ -5675,7 +5677,7 @@ pub mod tests {
             {
                 "owner": "11111111111111111111111111111111",
                 "lamports": 42,
-                "data": [base64::encode(&data[1..3]), "base64"],
+                "data": [BASE64_STANDARD.encode(&data[1..3]), "base64"],
                 "executable": false,
                 "rentEpoch": 0,
                 "space": 5,
@@ -8429,7 +8431,7 @@ pub mod tests {
         let ff_tx = vec![0xffu8; PACKET_DATA_SIZE];
         let tx58 = bs58::encode(&ff_tx).into_string();
         assert_eq!(tx58.len(), MAX_BASE58_SIZE);
-        let tx64 = base64::encode(&ff_tx);
+        let tx64 = BASE64_STANDARD.encode(&ff_tx);
         assert_eq!(tx64.len(), MAX_BASE64_SIZE);
     }
 
@@ -8449,7 +8451,7 @@ pub mod tests {
             )
         ));
 
-        let tx64 = base64::encode(&tx_ser);
+        let tx64 = BASE64_STANDARD.encode(&tx_ser);
         let tx64_len = tx64.len();
         assert_eq!(
             decode_and_deserialize::<Transaction>(tx64, TransactionBinaryEncoding::Base64)
@@ -8470,7 +8472,7 @@ pub mod tests {
             ))
         );
 
-        let tx64 = base64::encode(&tx_ser);
+        let tx64 = BASE64_STANDARD.encode(&tx_ser);
         assert_eq!(
             decode_and_deserialize::<Transaction>(tx64, TransactionBinaryEncoding::Base64)
                 .unwrap_err(),
@@ -8480,7 +8482,7 @@ pub mod tests {
         );
 
         let tx_ser = vec![0xffu8; PACKET_DATA_SIZE - 2];
-        let mut tx64 = base64::encode(&tx_ser);
+        let mut tx64 = BASE64_STANDARD.encode(&tx_ser);
         assert_eq!(
             decode_and_deserialize::<Transaction>(tx64.clone(), TransactionBinaryEncoding::Base64)
                 .unwrap_err(),
@@ -8606,7 +8608,9 @@ pub mod tests {
 
             let request = create_test_request(
                 "getFeeForMessage",
-                Some(json!([base64::encode(serialize(&legacy_msg).unwrap())])),
+                Some(json!([
+                    BASE64_STANDARD.encode(serialize(&legacy_msg).unwrap())
+                ])),
             );
             let response: RpcResponse<u64> = parse_success_result(rpc.handle_request_sync(request));
             assert_eq!(response.value, TEST_SIGNATURE_FEE);
@@ -8625,7 +8629,7 @@ pub mod tests {
 
             let request = create_test_request(
                 "getFeeForMessage",
-                Some(json!([base64::encode(serialize(&v0_msg).unwrap())])),
+                Some(json!([BASE64_STANDARD.encode(serialize(&v0_msg).unwrap())])),
             );
             let response: RpcResponse<u64> = parse_success_result(rpc.handle_request_sync(request));
             assert_eq!(response.value, TEST_SIGNATURE_FEE);
diff --git a/rpc/src/rpc_pubsub.rs b/rpc/src/rpc_pubsub.rs
index 0aec5951e6..339f95d681 100644
--- a/rpc/src/rpc_pubsub.rs
+++ b/rpc/src/rpc_pubsub.rs
@@ -607,6 +607,7 @@ mod tests {
             optimistically_confirmed_bank_tracker::OptimisticallyConfirmedBank, rpc_pubsub_service,
             rpc_subscriptions::RpcSubscriptions,
         },
+        base64::{prelude::BASE64_STANDARD, Engine},
         jsonrpc_core::{IoHandler, Response},
         serial_test::serial,
         solana_account_decoder::{parse_account_data::parse_account_data, UiAccountEncoding},
@@ -941,7 +942,7 @@ mod tests {
                    "value": {
                        "owner": stake_program_id.to_string(),
                        "lamports": balance,
-                       "data": [base64::encode(expected_data), encoding],
+                       "data": [BASE64_STANDARD.encode(expected_data), encoding],
                        "executable": false,
                        "rentEpoch": u64::MAX,
                        "space": expected_data.len(),
diff --git a/sdk/program/src/program_stubs.rs b/sdk/program/src/program_stubs.rs
index 1313099786..682be12ad2 100644
--- a/sdk/program/src/program_stubs.rs
+++ b/sdk/program/src/program_stubs.rs
@@ -7,6 +7,7 @@ use {
         account_info::AccountInfo, entrypoint::ProgramResult, instruction::Instruction,
         program_error::UNSUPPORTED_SYSVAR, pubkey::Pubkey,
     },
+    base64::{prelude::BASE64_STANDARD, Engine},
     itertools::Itertools,
     std::sync::{Arc, RwLock},
 };
@@ -89,7 +90,10 @@ pub trait SyscallStubs: Sync + Send {
     }
     fn sol_set_return_data(&self, _data: &[u8]) {}
     fn sol_log_data(&self, fields: &[&[u8]]) {
-        println!("data: {}", fields.iter().map(base64::encode).join(" "));
+        println!(
+            "data: {}",
+            fields.iter().map(|v| BASE64_STANDARD.encode(v)).join(" ")
+        );
     }
     fn sol_get_processed_sibling_instruction(&self, _index: usize) -> Option<Instruction> {
         None
diff --git a/test-validator/src/lib.rs b/test-validator/src/lib.rs
index 982ab859ae..9a54d855b7 100644
--- a/test-validator/src/lib.rs
+++ b/test-validator/src/lib.rs
@@ -1,5 +1,6 @@
 #![allow(clippy::integer_arithmetic)]
 use {
+    base64::{prelude::BASE64_STANDARD, Engine},
     crossbeam_channel::Receiver,
     log::*,
     solana_cli_output::CliAccount,
@@ -470,7 +471,8 @@ impl TestValidatorGenesis {
             address,
             AccountSharedData::from(Account {
                 lamports,
-                data: base64::decode(data_base64)
+                data: BASE64_STANDARD
+                    .decode(data_base64)
                     .unwrap_or_else(|err| panic!("Failed to base64 decode: {err}")),
                 owner,
                 executable: false,
diff --git a/transaction-status/src/lib.rs b/transaction-status/src/lib.rs
index 94f6bec3c6..c975fef6de 100644
--- a/transaction-status/src/lib.rs
+++ b/transaction-status/src/lib.rs
@@ -7,6 +7,7 @@ use {
         parse_accounts::{parse_legacy_message_accounts, parse_v0_message_accounts, ParsedAccount},
         parse_instruction::{parse, ParsedInstruction},
     },
+    base64::{prelude::BASE64_STANDARD, Engine},
     solana_account_decoder::parse_token::UiTokenAmount,
     solana_sdk::{
         clock::{Slot, UnixTimestamp},
@@ -1048,7 +1049,7 @@ impl EncodableWithMeta for VersionedTransaction {
                 TransactionBinaryEncoding::Base58,
             ),
             UiTransactionEncoding::Base64 => EncodedTransaction::Binary(
-                base64::encode(bincode::serialize(self).unwrap()),
+                BASE64_STANDARD.encode(bincode::serialize(self).unwrap()),
                 TransactionBinaryEncoding::Base64,
             ),
             UiTransactionEncoding::Json => self.json_encode(),
@@ -1088,7 +1089,7 @@ impl Encodable for Transaction {
                 TransactionBinaryEncoding::Base58,
             ),
             UiTransactionEncoding::Base64 => EncodedTransaction::Binary(
-                base64::encode(bincode::serialize(self).unwrap()),
+                BASE64_STANDARD.encode(bincode::serialize(self).unwrap()),
                 TransactionBinaryEncoding::Base64,
             ),
             UiTransactionEncoding::Json | UiTransactionEncoding::JsonParsed => {
@@ -1124,7 +1125,8 @@ impl EncodedTransaction {
                 .into_vec()
                 .ok()
                 .and_then(|bytes| bincode::deserialize(&bytes).ok()),
-            TransactionBinaryEncoding::Base64 => base64::decode(blob)
+            TransactionBinaryEncoding::Base64 => BASE64_STANDARD
+                .decode(blob)
                 .ok()
                 .and_then(|bytes| bincode::deserialize(&bytes).ok()),
         };
@@ -1308,7 +1310,7 @@ impl From<TransactionReturnData> for UiTransactionReturnData {
         Self {
             program_id: return_data.program_id.to_string(),
             data: (
-                base64::encode(return_data.data),
+                BASE64_STANDARD.encode(return_data.data),
                 UiReturnDataEncoding::Base64,
             ),
         }
diff --git a/transaction-status/src/parse_bpf_loader.rs b/transaction-status/src/parse_bpf_loader.rs
index 313c2dd4fb..f4d531a482 100644
--- a/transaction-status/src/parse_bpf_loader.rs
+++ b/transaction-status/src/parse_bpf_loader.rs
@@ -2,6 +2,7 @@ use {
     crate::parse_instruction::{
         check_num_accounts, ParsableProgram, ParseInstructionError, ParsedInstructionEnum,
     },
+    base64::{prelude::BASE64_STANDARD, Engine},
     bincode::deserialize,
     serde_json::json,
     solana_sdk::{
@@ -28,7 +29,7 @@ pub fn parse_bpf_loader(
                 instruction_type: "write".to_string(),
                 info: json!({
                     "offset": offset,
-                    "bytes": base64::encode(bytes),
+                    "bytes": BASE64_STANDARD.encode(bytes),
                     "account": account_keys[instruction.accounts[0] as usize].to_string(),
                 }),
             })
@@ -86,7 +87,7 @@ pub fn parse_bpf_upgradeable_loader(
                 instruction_type: "write".to_string(),
                 info: json!({
                     "offset": offset,
-                    "bytes": base64::encode(bytes),
+                    "bytes": BASE64_STANDARD.encode(bytes),
                     "account": account_keys[instruction.accounts[0] as usize].to_string(),
                     "authority": account_keys[instruction.accounts[1] as usize].to_string(),
                 }),
@@ -241,7 +242,7 @@ mod test {
                 instruction_type: "write".to_string(),
                 info: json!({
                     "offset": offset,
-                    "bytes": base64::encode(&bytes),
+                    "bytes": BASE64_STANDARD.encode(&bytes),
                     "account": account_pubkey.to_string(),
                 }),
             }
@@ -377,7 +378,7 @@ mod test {
                 instruction_type: "write".to_string(),
                 info: json!({
                     "offset": offset,
-                    "bytes": base64::encode(&bytes),
+                    "bytes": BASE64_STANDARD.encode(&bytes),
                     "account": buffer_address.to_string(),
                     "authority": authority_address.to_string(),
                 }),
diff --git a/zk-token-sdk/src/encryption/auth_encryption.rs b/zk-token-sdk/src/encryption/auth_encryption.rs
index 4081b33749..f85abe8430 100644
--- a/zk-token-sdk/src/encryption/auth_encryption.rs
+++ b/zk-token-sdk/src/encryption/auth_encryption.rs
@@ -12,6 +12,7 @@ use {
 };
 use {
     arrayref::{array_ref, array_refs},
+    base64::{prelude::BASE64_STANDARD, Engine},
     sha3::{Digest, Sha3_512},
     solana_sdk::{
         derivation_path::DerivationPath,
@@ -198,7 +199,7 @@ impl AeCiphertext {
 
 impl fmt::Display for AeCiphertext {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", base64::encode(self.to_bytes()))
+        write!(f, "{}", BASE64_STANDARD.encode(self.to_bytes()))
     }
 }
 
diff --git a/zk-token-sdk/src/encryption/elgamal.rs b/zk-token-sdk/src/encryption/elgamal.rs
index b5cbde910b..8c9d10bc29 100644
--- a/zk-token-sdk/src/encryption/elgamal.rs
+++ b/zk-token-sdk/src/encryption/elgamal.rs
@@ -18,6 +18,7 @@ use {
         discrete_log::DiscreteLog,
         pedersen::{Pedersen, PedersenCommitment, PedersenOpening, G, H},
     },
+    base64::{prelude::BASE64_STANDARD, Engine},
     core::ops::{Add, Mul, Sub},
     curve25519_dalek::{
         ristretto::{CompressedRistretto, RistrettoPoint},
@@ -329,7 +330,7 @@ impl ElGamalPubkey {
 
 impl fmt::Display for ElGamalPubkey {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", base64::encode(self.to_bytes()))
+        write!(f, "{}", BASE64_STANDARD.encode(self.to_bytes()))
     }
 }
 
@@ -496,7 +497,7 @@ impl ElGamalCiphertext {
 
 impl fmt::Display for ElGamalCiphertext {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", base64::encode(self.to_bytes()))
+        write!(f, "{}", BASE64_STANDARD.encode(self.to_bytes()))
     }
 }
 
diff --git a/zk-token-sdk/src/zk_token_elgamal/pod.rs b/zk-token-sdk/src/zk_token_elgamal/pod.rs
index fd728bc6a7..041bd2177c 100644
--- a/zk-token-sdk/src/zk_token_elgamal/pod.rs
+++ b/zk-token-sdk/src/zk_token_elgamal/pod.rs
@@ -1,6 +1,7 @@
 pub use bytemuck::{Pod, Zeroable};
 use {
     crate::zk_token_proof_instruction::ProofType,
+    base64::{prelude::BASE64_STANDARD, Engine},
     num_traits::{FromPrimitive, ToPrimitive},
     solana_program::instruction::InstructionError,
     std::fmt,
@@ -66,7 +67,7 @@ impl fmt::Debug for ElGamalCiphertext {
 
 impl fmt::Display for ElGamalCiphertext {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", base64::encode(self.0))
+        write!(f, "{}", BASE64_STANDARD.encode(self.0))
     }
 }
 
@@ -88,7 +89,7 @@ impl fmt::Debug for ElGamalPubkey {
 
 impl fmt::Display for ElGamalPubkey {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", base64::encode(self.0))
+        write!(f, "{}", BASE64_STANDARD.encode(self.0))
     }
 }
 
@@ -220,7 +221,7 @@ impl fmt::Debug for AeCiphertext {
 
 impl fmt::Display for AeCiphertext {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", base64::encode(self.0))
+        write!(f, "{}", BASE64_STANDARD.encode(self.0))
     }
 }