diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 3ef5719a..83591ad0 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -64,7 +64,7 @@ jobs:
         with:
           summarize: false
       - if: steps.filter.outputs.relevant == 'true'
-        uses: DeterminateSystems/magic-nix-cache-action@v14
+        uses: DeterminateSystems/magic-nix-cache-action@v15
         with:
           use-flakehub: "disabled"
 
@@ -151,7 +151,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - uses: DeterminateSystems/nix-installer-action@v22
-      - uses: DeterminateSystems/magic-nix-cache-action@v14
+      - uses: DeterminateSystems/magic-nix-cache-action@v15
         with:
           use-flakehub: "disabled"
       - run: nix build .#checks.x86_64-linux.${{ matrix.check }}
@@ -166,7 +166,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - uses: DeterminateSystems/nix-installer-action@v22
-      - uses: DeterminateSystems/magic-nix-cache-action@v14
+      - uses: DeterminateSystems/magic-nix-cache-action@v15
         with:
           use-flakehub: "disabled"
       - run: nix run .#${{ matrix.package }}
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 530d9299..1766a9d3 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -90,7 +90,7 @@ jobs:
         with:
           ref: v${{ needs.publish.outputs.version }}
       - uses: DeterminateSystems/nix-installer-action@v22
-      - uses: DeterminateSystems/magic-nix-cache-action@v14
+      - uses: DeterminateSystems/magic-nix-cache-action@v15
         with:
           use-flakehub: "disabled"
       - name: Publish crate
@@ -115,7 +115,7 @@ jobs:
         with:
           ref: v${{ needs.publish.outputs.version }}
       - uses: DeterminateSystems/nix-installer-action@v22
-      - uses: DeterminateSystems/magic-nix-cache-action@v14
+      - uses: DeterminateSystems/magic-nix-cache-action@v15
         with:
           use-flakehub: "disabled"
       # LICENSE and README.md are packed into the nupkg; LICENSE is a symlink
@@ -154,7 +154,7 @@ jobs:
         with:
           ref: v${{ needs.publish.outputs.version }}
       - uses: DeterminateSystems/nix-installer-action@v22
-      - uses: DeterminateSystems/magic-nix-cache-action@v14
+      - uses: DeterminateSystems/magic-nix-cache-action@v15
         with:
           use-flakehub: "disabled"
       - name: Build sdist