diff --git a/.github/workflows/publish-testpypi.yml b/.github/workflows/publish-testpypi.yml
index 2346133..c9634dc 100644
--- a/.github/workflows/publish-testpypi.yml
+++ b/.github/workflows/publish-testpypi.yml
@@ -31,7 +31,7 @@ jobs:
         with:
           ref: ${{ inputs.ref }}
           persist-credentials: false  # build from the tag only; publish is OIDC, not git creds
-      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  # v5
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6.3.0
         with: { python-version: "3.12" }
       - name: Build sdist + wheel
         run: |
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 667a873..284e589 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -30,7 +30,7 @@ jobs:
         with:
           ref: ${{ inputs.ref }}
           persist-credentials: false  # build from the tag only; publish is OIDC, not git creds
-      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  # v5
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6.3.0
         with:
           python-version: "3.12"
       - name: Build sdist + wheel
diff --git a/.github/workflows/release-gate.yml b/.github/workflows/release-gate.yml
index a6375d1..a83d03c 100644
--- a/.github/workflows/release-gate.yml
+++ b/.github/workflows/release-gate.yml
@@ -58,7 +58,7 @@ jobs:
           ref: ${{ inputs.ref || github.ref }}
           fetch-depth: 0
           persist-credentials: false  # build + Sigstore attest via OIDC; no authenticated git ops
-      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  # v5
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6.3.0
         with: { python-version: "3.12" }
       - name: Build sdist + wheel
         run: |