diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e38d65155..7ad90d53f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.47.0
+          toolchain: 1.51.0
           override: true
 
       - name: Fetch path to Zcash parameters
@@ -56,7 +56,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.47.0
+          toolchain: 1.51.0
           override: true
       - name: Add target
         run: rustup target add ${{ matrix.target }}
@@ -79,7 +79,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.47.0
+          toolchain: 1.51.0
           override: true
       # Build benchmarks to prevent bitrot
       - name: Build benchmarks
@@ -89,20 +89,20 @@ jobs:
           args: --all --benches
 
   clippy:
-    name: Clippy (1.47.0)
+    name: Clippy (1.51.0)
     timeout-minutes: 30
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.47.0
+          toolchain: 1.51.0
           components: clippy
           override: true
       - name: Run clippy
         uses: actions-rs/clippy-check@v1
         with:
-          name: Clippy (1.47.0)
+          name: Clippy (1.51.0)
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --all-features --all-targets -- -D warnings
 
@@ -176,7 +176,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: 1.51.0
           override: true
       - name: cargo fetch
         uses: actions-rs/cargo@v1
@@ -199,7 +199,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.47.0
+          toolchain: 1.51.0
           override: true
 
       # cargo fmt does not build the code, and running it in a fresh clone of
diff --git a/rust-toolchain b/rust-toolchain
index 21998d3c2..ba0a71911 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.47.0
+1.51.0
diff --git a/zcash_client_backend/CHANGELOG.md b/zcash_client_backend/CHANGELOG.md
index 29925cca5..9c44282d7 100644
--- a/zcash_client_backend/CHANGELOG.md
+++ b/zcash_client_backend/CHANGELOG.md
@@ -6,6 +6,8 @@ and this library adheres to Rust's notion of
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- MSRV is now 1.51.0.
 
 ## [0.5.0] - 2021-03-26
 ### Added
diff --git a/zcash_client_sqlite/CHANGELOG.md b/zcash_client_sqlite/CHANGELOG.md
index 1d55b70c0..84722f475 100644
--- a/zcash_client_sqlite/CHANGELOG.md
+++ b/zcash_client_sqlite/CHANGELOG.md
@@ -6,6 +6,8 @@ and this library adheres to Rust's notion of
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- MSRV is now 1.51.0.
 
 ## [0.3.0] - 2021-03-26
 This release contains a major refactor of the APIs to leverage the new Data
diff --git a/zcash_primitives/CHANGELOG.md b/zcash_primitives/CHANGELOG.md
index a163733e6..7c28407f8 100644
--- a/zcash_primitives/CHANGELOG.md
+++ b/zcash_primitives/CHANGELOG.md
@@ -6,6 +6,8 @@ and this library adheres to Rust's notion of
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- MSRV is now 1.51.0.
 
 ## [0.5.0] - 2021-03-26
 ### Added
diff --git a/zcash_proofs/CHANGELOG.md b/zcash_proofs/CHANGELOG.md
index db219f527..0ffb5f94a 100644
--- a/zcash_proofs/CHANGELOG.md
+++ b/zcash_proofs/CHANGELOG.md
@@ -6,6 +6,8 @@ and this library adheres to Rust's notion of
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- MSRV is now 1.51.0.
 
 ## [0.5.0] - 2021-03-26
 ### Added