diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1a854763..2844a0c1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,6 +32,8 @@ jobs:
           components: rustfmt, clippy
 
       - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
+        with:
+          key: ${{ hashFiles('**/Cargo.lock') }}
 
       - name: Cargo fmt
         run: |
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index ea037819..7c9336a5 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -30,6 +30,8 @@ jobs:
         uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
 
       - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
+        with:
+          key: ${{ hashFiles('**/Cargo.lock') }}
 
       - name: Install a specific version of uv
         uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
diff --git a/.github/workflows/test-python.yml b/.github/workflows/test-python.yml
index 1e253b1c..fd04e2b9 100644
--- a/.github/workflows/test-python.yml
+++ b/.github/workflows/test-python.yml
@@ -52,6 +52,12 @@ jobs:
         uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
 
       - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
+        with:
+          # rust-cache normalizes version numbers before hashing Cargo.lock,
+          # so minor/patch dep bumps don't invalidate the cache. Append the
+          # raw lockfile hash (and matrix Python version) to force a fresh
+          # cache entry whenever Cargo.lock actually changes.
+          key: ${{ matrix.python-version }}-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Install uv
         uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7