diff --git a/.github/actions/setup-nix-direnv-rust/action.yml b/.github/actions/setup-nix-direnv-rust/action.yml
index 49d518c..e251361 100644
--- a/.github/actions/setup-nix-direnv-rust/action.yml
+++ b/.github/actions/setup-nix-direnv-rust/action.yml
@@ -7,7 +7,7 @@ runs:
     - uses: nix-community/cache-nix-action@135667ec418502fa5a3598af6fb9eb733888ce6a  # v6
       with:
           # restore and save a cache using this key
-          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', 'nix/sources.json') }}
+          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', 'nix/sources.json', 'rust-toolchain.toml') }}
           # if there's no cache hit, restore a cache by this prefix
           restore-prefixes-first-match: nix-${{ runner.os }}-
     - uses: HatsuneMiku3939/direnv-action@89ed6f6786c25aa7a69cd12f9fd0fdcb46c7c489  # Latest as of 2025-05-16
diff --git a/nix/sources.json b/nix/sources.json
index 3614497..da67e14 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -17,10 +17,10 @@
         "homepage": "",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "6d14586a5917a1ec7f045ac97e6d00c68ea5d9f3",
-        "sha256": "0kzg34bv6ap1jgq8x2bawn7rv3pkhd53z8zdvpykyvqqkxpw0dsf",
+        "rev": "71f9daa4e05e49c434d08627e755495ae222bc34",
+        "sha256": "1vdqw008wza6vx823hd5wb7my72fhj006i1695mbvg0kfl7dh5z2",
         "type": "tarball",
-        "url": "https://github.com/oxalica/rust-overlay/archive/6d14586a5917a1ec7f045ac97e6d00c68ea5d9f3.tar.gz",
+        "url": "https://github.com/oxalica/rust-overlay/archive/71f9daa4e05e49c434d08627e755495ae222bc34.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 693a919..c226aba 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.92.0"
+channel = "1.93.0"
 components = ["clippy", "rustfmt", "rust-analyzer", "rust-src"]
 profile = "minimal"