diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9644273..740574c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -43,6 +43,7 @@ jobs:
         uses: actions-rust-lang/setup-rust-toolchain@ecabd13d1c56bd1345c230e542e9144811ad706f # v2.0.0
         with:
           toolchain: ${{ matrix.toolchain.version }}
+          cache-key: ${{ hashFiles('flake.lock', 'flake.nix') }}
 
       - name: Install Nix
         uses: nixbuild/nix-quick-install-action@9f63be77f412a248c9d9a65a4c82cf066cdf8f0c # v35
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 205c75f..e3370ec 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -25,6 +25,7 @@ jobs:
         uses: actions-rust-lang/setup-rust-toolchain@ecabd13d1c56bd1345c230e542e9144811ad706f # v2.0.0
         with:
           components: llvm-tools-preview
+          cache-key: ${{ hashFiles('flake.lock', 'flake.nix') }}
 
       - name: Install Nix
         uses: nixbuild/nix-quick-install-action@9f63be77f412a248c9d9a65a4c82cf066cdf8f0c # v35
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 8564d6d..622ed6a 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -30,6 +30,7 @@ jobs:
         uses: actions-rust-lang/setup-rust-toolchain@ecabd13d1c56bd1345c230e542e9144811ad706f # v2.0.0
         with:
           components: clippy
+          cache-key: ${{ hashFiles('flake.lock', 'flake.nix') }}
 
       - name: Install Nix
         uses: nixbuild/nix-quick-install-action@9f63be77f412a248c9d9a65a4c82cf066cdf8f0c # v35