diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index f60e41f..bc5b2b7 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -16,10 +16,10 @@ jobs:
 
     steps:
       - name: Check out code
-        uses: actions/checkout@v6
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@681c641aba71e4a1c380be3ab5e12ad51f415867 # v7
 
       - name: Build package
         run: |
@@ -33,27 +33,27 @@ jobs:
 
       # Log in to GitHub Container Registry
       - name: Log in to GHCR
-        uses: docker/login-action@v3
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push Docker image to GHCR
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
         with:
           context: .
           push: true
           tags: ghcr.io/${{ github.repository_owner }}/speedtest:latest
 
       - name: Log in to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Build and push Docker image to Docker Hub
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
         with:
           context: .
           push: true
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1233797..0b2254b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -21,15 +21,15 @@ jobs:
         python-version: ["3.9", "3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@681c641aba71e4a1c380be3ab5e12ad51f415867 # v7
 
       - name: Install dependencies
         run: |
diff --git a/Dockerfile b/Dockerfile
index a8ede10..35a2d17 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Install uv
-FROM python:3.13-slim
+FROM python:3.13-slim@sha256:baf66684c5fcafbda38a54b227ee30ec41e40af1e4073edee3a7110a417756ba
 
 WORKDIR /app