diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index e2cf4200..b480cc05 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -15,14 +15,14 @@ jobs:
         otp: ['25']
         elixir: ['1.13']
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: erlef/setup-beam@v1
         id: beam
         with:
           otp-version: ${{matrix.otp}}
           elixir-version: ${{matrix.elixir}}
       - name: PLT cache
-        uses: actions/cache@v2
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
         with:
           key: |
             ${{ runner.os }}-${{ steps.beam.outputs.elixir-version }}-${{ steps.beam.outputs.otp-version }}-plt
@@ -42,12 +42,12 @@ jobs:
     env:
       MIX_ENV: test
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: erlef/setup-beam@v1
         with:
           otp-version: 24
           elixir-version: 1.13
-      - uses: actions/cache@v2
+      - uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
         with:
           key: |
             ${{ runner.os }}-${{ steps.beam.outputs.elixir-version }}-${{ steps.beam.outputs.otp-version }}-plug-build
@@ -73,12 +73,12 @@ jobs:
           - {otp: '25', elixir: '1.11'}
           - {otp: '25', elixir: '1.12'}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{matrix.otp}}
           elixir-version: ${{matrix.elixir}}
-      - uses: actions/cache@v2
+      - uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
         with:
           key: |
             ${{ runner.os }}-${{ steps.beam.outputs.elixir-version }}-${{ steps.beam.outputs.otp-version }}-build
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 43bd864f..5fd59a83 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out
-        uses: actions/checkout@v2
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - uses: erlef/setup-beam@v1
         id: beam