diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 42f8154dc..82fa3655e 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -31,7 +31,7 @@ jobs:
         with:
           # Fixed version for clippy lints.  Bump this as necesary.  It must not
           # be older than the MSRV in tests.yml.
-          toolchain: "1.63"
+          toolchain: "1.64"
           override: true
 
       - uses: actions-rs/cargo@v1.0.3
diff --git a/.github/workflows/rust-tests.yml b/.github/workflows/rust-tests.yml
index bf1443731..8948c5756 100644
--- a/.github/workflows/rust-tests.yml
+++ b/.github/workflows/rust-tests.yml
@@ -16,7 +16,7 @@ jobs:
       matrix:
         rust:
           # MSRV; must not be higher than the clippy rust version in checks.yml
-          - "1.63"
+          - "1.64"
           - "stable"
         os:
           - ubuntu-latest
diff --git a/taskchampion/taskchampion/src/lib.rs b/taskchampion/taskchampion/src/lib.rs
index a711214aa..680b637ec 100644
--- a/taskchampion/taskchampion/src/lib.rs
+++ b/taskchampion/taskchampion/src/lib.rs
@@ -41,7 +41,7 @@ for more information about the design and usage of the tool.
 
 # Minimum Supported Rust Version (MSRV)
 
-This crate supports Rust version 1.63 and higher.
+This crate supports Rust version 1.64 and higher.
 
  */