diff --git a/.github/workflows/ci-pre-commit.yaml b/.github/workflows/ci-pre-commit.yaml
index f302ae5..4e954a1 100644
--- a/.github/workflows/ci-pre-commit.yaml
+++ b/.github/workflows/ci-pre-commit.yaml
@@ -10,7 +10,7 @@ jobs:
     name: PreCommit
     runs-on: ubuntu-latest
     steps:
-    - uses: DeterminateSystems/nix-installer-action@90bb610b90bf290cad97484ba341453bd1cbefea # v19
+    - uses: DeterminateSystems/nix-installer-action@786fff0690178f1234e4e1fe9b536e94f5433196 # v20
       with:
         diagnostic-endpoint: ""
     - uses: DeterminateSystems/magic-nix-cache-action@565684385bcd71bad329742eefe8d12f2e765b39 # v13
diff --git a/.github/workflows/ci-tests-all.yaml b/.github/workflows/ci-tests-all.yaml
index 222f1e7..0dcaa2f 100644
--- a/.github/workflows/ci-tests-all.yaml
+++ b/.github/workflows/ci-tests-all.yaml
@@ -21,7 +21,7 @@ jobs:
       matrix:
         test: ["tests", "validate"]
     steps:
-    - uses: DeterminateSystems/nix-installer-action@90bb610b90bf290cad97484ba341453bd1cbefea # v19
+    - uses: DeterminateSystems/nix-installer-action@786fff0690178f1234e4e1fe9b536e94f5433196 # v20
       with:
         diagnostic-endpoint: ""