diff --git a/.cargo/config.offline b/.cargo/config.offline
index 01d8840e1..2ede4e521 100644
--- a/.cargo/config.offline
+++ b/.cargo/config.offline
@@ -6,7 +6,7 @@ replace-with = "vendored-sources"
 
 [source."https://github.com/zcash/librustzcash.git"]
 git = "https://github.com/zcash/librustzcash.git"
-rev = "d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+rev = "50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 replace-with = "vendored-sources"
 
 [source."https://github.com/nuttycom/hdwallet.git"]
diff --git a/Cargo.lock b/Cargo.lock
index de4356cff..71e2c949a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -562,7 +562,7 @@ checksum = "c34f04666d835ff5d62e058c3995147c06f42fe86ff053337632bca83e42702d"
 [[package]]
 name = "equihash"
 version = "0.1.0"
-source = "git+https://github.com/zcash/librustzcash.git?rev=d5c5f048947d211c2fbef23ce986b329b91d1aa5#d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+source = "git+https://github.com/zcash/librustzcash.git?rev=50bae5ed76737ae8db6b84a940dd1d2c08daeefd#50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 dependencies = [
  "blake2b_simd",
  "byteorder",
@@ -571,7 +571,7 @@ dependencies = [
 [[package]]
 name = "f4jumble"
 version = "0.0.0"
-source = "git+https://github.com/zcash/librustzcash.git?rev=d5c5f048947d211c2fbef23ce986b329b91d1aa5#d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+source = "git+https://github.com/zcash/librustzcash.git?rev=50bae5ed76737ae8db6b84a940dd1d2c08daeefd#50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 dependencies = [
  "blake2b_simd",
 ]
@@ -2201,7 +2201,7 @@ dependencies = [
 [[package]]
 name = "zcash_address"
 version = "0.0.0"
-source = "git+https://github.com/zcash/librustzcash.git?rev=d5c5f048947d211c2fbef23ce986b329b91d1aa5#d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+source = "git+https://github.com/zcash/librustzcash.git?rev=50bae5ed76737ae8db6b84a940dd1d2c08daeefd#50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 dependencies = [
  "bech32",
  "bs58",
@@ -2212,7 +2212,7 @@ dependencies = [
 [[package]]
 name = "zcash_encoding"
 version = "0.0.0"
-source = "git+https://github.com/zcash/librustzcash.git?rev=d5c5f048947d211c2fbef23ce986b329b91d1aa5#d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+source = "git+https://github.com/zcash/librustzcash.git?rev=50bae5ed76737ae8db6b84a940dd1d2c08daeefd#50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 dependencies = [
  "byteorder",
  "nonempty",
@@ -2221,7 +2221,7 @@ dependencies = [
 [[package]]
 name = "zcash_history"
 version = "0.2.0"
-source = "git+https://github.com/zcash/librustzcash.git?rev=d5c5f048947d211c2fbef23ce986b329b91d1aa5#d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+source = "git+https://github.com/zcash/librustzcash.git?rev=50bae5ed76737ae8db6b84a940dd1d2c08daeefd#50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 dependencies = [
  "bigint",
  "blake2b_simd",
@@ -2231,7 +2231,7 @@ dependencies = [
 [[package]]
 name = "zcash_note_encryption"
 version = "0.1.0"
-source = "git+https://github.com/zcash/librustzcash.git?rev=d5c5f048947d211c2fbef23ce986b329b91d1aa5#d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+source = "git+https://github.com/zcash/librustzcash.git?rev=50bae5ed76737ae8db6b84a940dd1d2c08daeefd#50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 dependencies = [
  "chacha20",
  "chacha20poly1305",
@@ -2242,7 +2242,7 @@ dependencies = [
 [[package]]
 name = "zcash_primitives"
 version = "0.5.0"
-source = "git+https://github.com/zcash/librustzcash.git?rev=d5c5f048947d211c2fbef23ce986b329b91d1aa5#d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+source = "git+https://github.com/zcash/librustzcash.git?rev=50bae5ed76737ae8db6b84a940dd1d2c08daeefd#50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 dependencies = [
  "aes",
  "bip0039",
@@ -2278,7 +2278,7 @@ dependencies = [
 [[package]]
 name = "zcash_proofs"
 version = "0.5.0"
-source = "git+https://github.com/zcash/librustzcash.git?rev=d5c5f048947d211c2fbef23ce986b329b91d1aa5#d5c5f048947d211c2fbef23ce986b329b91d1aa5"
+source = "git+https://github.com/zcash/librustzcash.git?rev=50bae5ed76737ae8db6b84a940dd1d2c08daeefd#50bae5ed76737ae8db6b84a940dd1d2c08daeefd"
 dependencies = [
  "bellman",
  "blake2b_simd",
diff --git a/Cargo.toml b/Cargo.toml
index 405bd323b..b5c33f5c3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -85,9 +85,9 @@ codegen-units = 1
 
 [patch.crates-io]
 hdwallet = { git = "https://github.com/nuttycom/hdwallet", rev = "9b4c1bdbe0517e3a7a8f285d6048a37d472ba3bc" }
-zcash_address = { git = "https://github.com/zcash/librustzcash.git", rev = "d5c5f048947d211c2fbef23ce986b329b91d1aa5" }
-zcash_encoding = { git = "https://github.com/zcash/librustzcash.git", rev = "d5c5f048947d211c2fbef23ce986b329b91d1aa5" }
-zcash_history = { git = "https://github.com/zcash/librustzcash.git", rev = "d5c5f048947d211c2fbef23ce986b329b91d1aa5" }
-zcash_note_encryption = { git = "https://github.com/zcash/librustzcash.git", rev = "d5c5f048947d211c2fbef23ce986b329b91d1aa5" }
-zcash_primitives = { git = "https://github.com/zcash/librustzcash.git", rev = "d5c5f048947d211c2fbef23ce986b329b91d1aa5" }
-zcash_proofs = { git = "https://github.com/zcash/librustzcash.git", rev = "d5c5f048947d211c2fbef23ce986b329b91d1aa5" }
+zcash_address = { git = "https://github.com/zcash/librustzcash.git", rev = "50bae5ed76737ae8db6b84a940dd1d2c08daeefd" }
+zcash_encoding = { git = "https://github.com/zcash/librustzcash.git", rev = "50bae5ed76737ae8db6b84a940dd1d2c08daeefd" }
+zcash_history = { git = "https://github.com/zcash/librustzcash.git", rev = "50bae5ed76737ae8db6b84a940dd1d2c08daeefd" }
+zcash_note_encryption = { git = "https://github.com/zcash/librustzcash.git", rev = "50bae5ed76737ae8db6b84a940dd1d2c08daeefd" }
+zcash_primitives = { git = "https://github.com/zcash/librustzcash.git", rev = "50bae5ed76737ae8db6b84a940dd1d2c08daeefd" }
+zcash_proofs = { git = "https://github.com/zcash/librustzcash.git", rev = "50bae5ed76737ae8db6b84a940dd1d2c08daeefd" }
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 1faec4cee..5f03599c9 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -418,8 +418,7 @@ public:
         consensus.vUpgrades[Consensus::UPGRADE_CANOPY].hashActivationBlock =
             uint256S("01a4d7c6aada30c87762c1bf33fff5df7266b1fd7616bfdb5227fa59bd79e7a2");
         consensus.vUpgrades[Consensus::UPGRADE_NU5].nProtocolVersion = 170050;
-        consensus.vUpgrades[Consensus::UPGRADE_NU5].nActivationHeight =
-            Consensus::NetworkUpgrade::NO_ACTIVATION_HEIGHT;
+        consensus.vUpgrades[Consensus::UPGRADE_NU5].nActivationHeight = 1840000;
         consensus.vUpgrades[Consensus::UPGRADE_ZFUTURE].nProtocolVersion = 0x7FFFFFFF;
         consensus.vUpgrades[Consensus::UPGRADE_ZFUTURE].nActivationHeight =
             Consensus::NetworkUpgrade::NO_ACTIVATION_HEIGHT;