diff --git a/.github/workflows/bootstrap.yml b/.github/workflows/bootstrap.yml
index c04f5ad..7d595bb 100644
--- a/.github/workflows/bootstrap.yml
+++ b/.github/workflows/bootstrap.yml
@@ -26,7 +26,7 @@ jobs:
       SNTY_DEVENV_BRANCH:
         "${{ github.event.pull_request && github.head_ref || github.ref_name }}"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       # devenv no longer manages uv; linux users need to install it themselves
       - uses: astral-sh/setup-uv@884ad927a57e558e7a70b92f2bccf9198a4be546 # v6
@@ -52,7 +52,7 @@ jobs:
       SNTY_DEVENV_BRANCH:
         "${{ github.event.pull_request && github.head_ref || github.ref_name }}"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - name: remove homebrew
         run: |
           sudo rm -rf \
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 094a426..88af752 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,15 +9,15 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c # v4
         with:
           python-version: 3.11
       - name: "Prepare Artifacts"
         run: |
           pip install build
           python -m build
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: ${{ github.sha }}
           path: dist/*
diff --git a/.github/workflows/integration.yml b/.github/workflows/integration.yml
index 9f8ba8c..416804b 100644
--- a/.github/workflows/integration.yml
+++ b/.github/workflows/integration.yml
@@ -29,7 +29,7 @@ jobs:
       SNTY_DEVENV_BRANCH:
         "${{ github.event.pull_request && github.head_ref || github.ref_name }}"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - name: install devenv
         run: |
           set -u
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index b83112d..6b8b7d7 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -15,7 +15,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v5
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: astral-sh/setup-uv@e58605a9b6da7c637471fab8847a5e5a6b8df081 # v5
       - run: uv sync
-      - uses: pre-commit/action@v3.0.0
+      - uses: pre-commit/action@646c83fcd040023954eafda54b4db0192ce70507 # v3.0.0
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 885ec35..ca62850 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -20,12 +20,12 @@ jobs:
         with:
           app-id: ${{ vars.SENTRY_RELEASE_BOT_CLIENT_ID }}
           private-key: ${{ secrets.SENTRY_RELEASE_BOT_PRIVATE_KEY }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           token: ${{ steps.token.outputs.token }}
           fetch-depth: 0
       - name: Prepare release
-        uses: getsentry/action-prepare-release@v1
+        uses: getsentry/action-prepare-release@c8e1c2009ab08259029170132c384f03c1064c0e # v1
         env:
           GITHUB_TOKEN: ${{ steps.token.outputs.token }}
         with:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 45608c6..2bd9728 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v5
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: astral-sh/setup-uv@e58605a9b6da7c637471fab8847a5e5a6b8df081 # v5
       - run: uv sync
       - run: uv run coverage erase && uv run coverage run -m pytest && uv run coverage report