diff --git a/Cargo.lock b/Cargo.lock
index a504bc7d9..70b821ea9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -439,9 +439,9 @@ dependencies = [
 
 [[package]]
 name = "cxx"
-version = "1.0.79"
+version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f83d0ebf42c6eafb8d7c52f7e5f2d3003b89c7aa4fd2b79229209459a849af8"
+checksum = "bdf07d07d6531bfcdbe9b8b739b104610c6508dcc4d63b410585faf338241daf"
 dependencies = [
  "cc",
  "cxxbridge-flags",
@@ -451,15 +451,15 @@ dependencies = [
 
 [[package]]
 name = "cxxbridge-flags"
-version = "1.0.79"
+version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99d2199b00553eda8012dfec8d3b1c75fce747cf27c169a270b3b99e3448ab78"
+checksum = "ac040a39517fd1674e0f32177648334b0f4074625b5588a64519804ba0553b12"
 
 [[package]]
 name = "cxxbridge-macro"
-version = "1.0.79"
+version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcb67a6de1f602736dd7eaead0080cf3435df806c61b24b13328db128c58868f"
+checksum = "1362b0ddcfc4eb0a1f57b68bd77dd99f0e826958a96abd0ae9bd092e114ffed6"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 29dba4bea..62e39a1ca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -68,7 +68,7 @@ zeroize = "1.4.2"
 
 # Rust/C++ interop
 # The version needs to match depends/packages/native_cxxbridge.mk
-cxx = { version = "=1.0.79", features = ["c++17"] }
+cxx = { version = "=1.0.83", features = ["c++17"] }
 
 # Rust threading
 rayon = "1.5"
diff --git a/depends/packages/native_cxxbridge.mk b/depends/packages/native_cxxbridge.mk
index 3fe05a407..836dcaad4 100644
--- a/depends/packages/native_cxxbridge.mk
+++ b/depends/packages/native_cxxbridge.mk
@@ -1,10 +1,10 @@
 package=native_cxxbridge
 # The version needs to match cxx in Cargo.toml
-$(package)_version=1.0.79
+$(package)_version=1.0.83
 $(package)_download_path=https://github.com/dtolnay/cxx/archive/refs/tags
 $(package)_file_name=native_cxxbridge-$($(package)_version).tar.gz
 $(package)_download_file=$($(package)_version).tar.gz
-$(package)_sha256_hash=4da400783dee17e9a99dd39a17cd2cc346df311cb8745832e2b4d5173c23dfcd
+$(package)_sha256_hash=e30cbd34fc8ec2ae78f4f9e546d29c6c92e6d714f30c3c150f7b8c6ea08ea971
 $(package)_build_subdir=gen/cmd
 $(package)_dependencies=native_rust
 $(package)_extra_sources=$(package)-$($(package)_version)-vendored.tar.gz
diff --git a/qa/supply-chain/audits.toml b/qa/supply-chain/audits.toml
index 4c4457cdb..70ca3574a 100644
--- a/qa/supply-chain/audits.toml
+++ b/qa/supply-chain/audits.toml
@@ -130,6 +130,11 @@ a struct containing both the pointer to an error message and its length,
 instead of just the raw `*const u8`.
 """
 
+[[audits.cxx]]
+who = "Jack Grigg <jack@z.cash>"
+criteria = "safe-to-deploy"
+delta = "1.0.79 -> 1.0.83"
+
 [[audits.cxxbridge-flags]]
 who = "Daira Hopwood <daira@jacaranda.org>"
 criteria = "safe-to-deploy"
@@ -151,6 +156,11 @@ criteria = "safe-to-deploy"
 delta = "1.0.78 -> 1.0.79"
 notes = "This is exclusively an update to the `cxxbridge` dependency version."
 
+[[audits.cxxbridge-flags]]
+who = "Jack Grigg <jack@z.cash>"
+criteria = "safe-to-deploy"
+delta = "1.0.79 -> 1.0.83"
+
 [[audits.cxxbridge-macro]]
 who = "Daira Hopwood <daira@jacaranda.org>"
 criteria = "safe-to-deploy"
@@ -177,6 +187,11 @@ criteria = "safe-to-deploy"
 delta = "1.0.78 -> 1.0.79"
 notes = "This is exclusively an update to the `cxxbridge` dependency version."
 
+[[audits.cxxbridge-macro]]
+who = "Jack Grigg <jack@z.cash>"
+criteria = "safe-to-deploy"
+delta = "1.0.79 -> 1.0.83"
+
 [[audits.ed25519-zebra]]
 who = "Jack Grigg <jack@z.cash>"
 criteria = "safe-to-deploy"
diff --git a/qa/zcash/postponed-updates.txt b/qa/zcash/postponed-updates.txt
index 2b7e77a99..211cba31c 100644
--- a/qa/zcash/postponed-updates.txt
+++ b/qa/zcash/postponed-updates.txt
@@ -4,14 +4,13 @@
 # bdb 18.1.40 2020-09-01
 #
 
-native_cxxbridge 1.0.80 2022-12-10
-native_cxxbridge 1.0.81 2022-12-10
-native_cxxbridge 1.0.82 2022-12-10
-native_cxxbridge 1.0.83 2022-12-10
-rustcxx 1.0.80 2022-12-10
-rustcxx 1.0.81 2022-12-10
-rustcxx 1.0.82 2022-12-10
-rustcxx 1.0.83 2022-12-10
+# cxx 1.0.84-1.0.86 didn't update third-party/Cargo.lock
+native_cxxbridge 1.0.84 2024-02-01
+native_cxxbridge 1.0.85 2024-02-01
+native_cxxbridge 1.0.86 2024-02-01
+rustcxx 1.0.84 2024-02-01
+rustcxx 1.0.85 2024-02-01
+rustcxx 1.0.86 2024-02-01
 
 # CCache 4.7 appears to drop support for Ubuntu 18.04
 native_ccache 4.7 2023-03-01