diff --git a/.github/workflows/check-latest-spec-version.yml b/.github/workflows/check-latest-spec-version.yml
index a754ce6..a01065c 100644
--- a/.github/workflows/check-latest-spec-version.yml
+++ b/.github/workflows/check-latest-spec-version.yml
@@ -37,7 +37,7 @@ jobs:
       contents: read
       issues: write
     steps:
-      - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea
+      - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           script: |
             const release = await github.rest.repos.getLatestRelease({
diff --git a/.github/workflows/draft.yml b/.github/workflows/draft.yml
index f00ada8..47115bb 100644
--- a/.github/workflows/draft.yml
+++ b/.github/workflows/draft.yml
@@ -10,13 +10,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Set up Python
-      uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c
+      uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # v5.0.0
       with:
         python-version: '3.10'
         cache: pip
 
     - name: Clone
-      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
     - name: Build specification
       run: |
@@ -25,7 +25,7 @@ jobs:
         make -f ../Makefile draft
 
     - name: Switch branch
-      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       with:
         ref: gh-pages
         clean: false
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index ad58505..c15ca9f 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -9,12 +9,12 @@ jobs:
     name: Sanity checks before a PR merge
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
         with:
           fetch-depth: 0 # we want all refs for the --is-ancestor check
 
       - name: Set up Python
-        uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c
+        uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # v5.0.0
         with:
           python-version: '3.10'
           cache: pip
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 97e8937..de65b5f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,7 +12,7 @@ jobs:
       contents: write # required to publish (tag) a release 
     steps:
     - name: Clone main
-      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       with:
         fetch-depth: 0
 
@@ -30,14 +30,14 @@ jobs:
 
     - name: Set up Python
       if: steps.getver.outputs.spec_version != steps.prevver.outputs.prev_version
-      uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c
+      uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # v5.0.0
       with:
         python-version: '3.10'
         cache: 'pip'
 
     - name: Make release
       if: steps.getver.outputs.spec_version != steps.prevver.outputs.prev_version
-      uses: actions/create-release@0cb9c9b65d5d1901c1f53e5e66eaf4afd303e70e
+      uses: actions/create-release@0cb9c9b65d5d1901c1f53e5e66eaf4afd303e70e # v1.1.4
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       with:
@@ -54,7 +54,7 @@ jobs:
 
     - name: Switch branch
       if: steps.getver.outputs.spec_version != steps.prevver.outputs.prev_version
-      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       with:
         ref: gh-pages
         clean: false