diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
index 1a21e9f..d19287d 100644
--- a/.github/workflows/shellcheck.yml
+++ b/.github/workflows/shellcheck.yml
@@ -11,6 +11,6 @@ jobs:
     name: ShellCheck
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
     - name: Run ShellCheck
       run: find . -type f -name "*.sh" -exec shellcheck {} +
diff --git a/compose.yml b/compose.yml
index 1357efc..d9567eb 100644
--- a/compose.yml
+++ b/compose.yml
@@ -2,7 +2,7 @@
 # yaml-language-server: $schema=https://raw.githubusercontent.com/compose-spec/compose-spec/main/schema/compose-spec.json
 services:
   caddy:
-    image: caddy:2.10.0-alpine
+    image: caddy:2.10.0-alpine@sha256:e2e3a089760c453bc51c4e718342bd7032d6714f15b437db7121bfc2de2654a6
     restart: always
     ports:
       - "80:80"
@@ -59,7 +59,7 @@ services:
       - ghost_network
 
   db:
-    image: mysql:8.0.42
+    image: mysql:8.0.42@sha256:4445b2668d41143cb50e471ee207f8822006249b6859b24f7e12479684def5d9
     restart: always
     expose:
       - "3306"
diff --git a/tinybird/Dockerfile b/tinybird/Dockerfile
index 53c9e8a..17d589a 100644
--- a/tinybird/Dockerfile
+++ b/tinybird/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.13-slim
+FROM python:3.13-slim@sha256:6544e0e002b40ae0f59bc3618b07c1e48064c4faed3a15ae2fbd2e8f663e8283
 
 # Install dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \