diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 71ba2b99d6c6..bf83fdd32167 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -52,7 +52,7 @@ jobs:
         with:
           merged-as-untrusted-at: ${{ inputs.mergedSha }}
 
-      - uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+      - uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
         with:
           # Sandbox is disabled on MacOS by default.
           extra_nix_config: sandbox = true
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 408ba7369e62..15db37f6c99e 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -96,7 +96,7 @@ jobs:
           merged-as-untrusted-at: ${{ inputs.mergedSha }}
           target-as-trusted-at: ${{ inputs.targetSha }}
 
-      - uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+      - uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
         with:
diff --git a/.github/workflows/eval.yml b/.github/workflows/eval.yml
index eaf1ac35bb6e..5ef33f4dc34b 100644
--- a/.github/workflows/eval.yml
+++ b/.github/workflows/eval.yml
@@ -47,7 +47,7 @@ jobs:
             ci/pinned.json
 
       - name: Install Nix
-        uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+        uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       - name: Load supported versions
         id: versions
@@ -92,7 +92,7 @@ jobs:
           target-as-trusted-at: ${{ inputs.targetSha }}
 
       - name: Install Nix
-        uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+        uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
         with:
@@ -190,7 +190,7 @@ jobs:
           merge-multiple: true
 
       - name: Install Nix
-        uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+        uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       - name: Combine all output paths and eval stats
         run: |
@@ -350,7 +350,7 @@ jobs:
           merged-as-untrusted-at: ${{ inputs.mergedSha }}
 
       - name: Install Nix
-        uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+        uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       - name: Run misc eval tasks in parallel
         run: |
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index f3d4a8360f1b..39a99acf3f32 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -32,7 +32,7 @@ jobs:
         with:
           merged-as-untrusted-at: ${{ inputs.mergedSha }}
 
-      - uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+      - uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       # TODO: Figure out how to best enable caching for the treefmt job. Cachix won't work well,
       # because the cache would be invalidated on every commit - treefmt checks every file.
@@ -66,7 +66,7 @@ jobs:
         with:
           merged-as-untrusted-at: ${{ inputs.mergedSha }}
 
-      - uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+      - uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
         with:
@@ -94,7 +94,7 @@ jobs:
           merged-as-untrusted-at: ${{ inputs.mergedSha }}
           target-as-trusted-at: ${{ inputs.targetSha }}
 
-      - uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+      - uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
         with:
diff --git a/.github/workflows/reviewers.yml b/.github/workflows/reviewers.yml
index 3d5d08f8d7cf..c6f94acbec36 100644
--- a/.github/workflows/reviewers.yml
+++ b/.github/workflows/reviewers.yml
@@ -33,7 +33,7 @@ jobs:
           sparse-checkout: ci
 
       - name: Install Nix
-        uses: cachix/install-nix-action@7be5dee1421f63d07e71ce6e0a9f8a4b07c2a487 # v31
+        uses: cachix/install-nix-action@a809471b5c7c913aa67bec8f459a11a0decc3fce # v31
 
       - name: Build the requestReviews derivation
         run: nix-build trusted/ci -A requestReviews