diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index d48fb84..8e3c39c 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -48,7 +48,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.38.0
+          toolchain: 1.40.0
           override: true
       - uses: actions-rs/cargo@v1
         with:
diff --git a/README.md b/README.md
index 53b037e..850d725 100644
--- a/README.md
+++ b/README.md
@@ -87,7 +87,7 @@ Run `bundle install` when the `Gemfile` changes:
 
 #### Cargo
 
-Requires Rust 1.38 or later.
+Requires Rust 1.40 or later.
 
     $ cargo install watchexec