diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 2849e37..98f6930 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -23,7 +23,7 @@ jobs:
         working-directory: ${{ matrix.tuleap_functions }}
     steps:
       - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
-      - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
+      - uses: cachix/install-nix-action@ba0dd844c9180cbf77aa72a116d6fbc515d0e87b # v27
       - name: Prepare
         run: nix-shell --run "make prepare"
       - name: Tests