diff --git a/Dockerfile b/Dockerfile
index 5fdbf58..c95ac95 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
-FROM python:3.12-slim-trixie
+FROM python:3.12-slim-trixie@sha256:d86b4c74b936c438cd4cc3a9f7256b9a7c27ad68c7caf8c205e18d9845af0164
 
-COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+COPY --from=ghcr.io/astral-sh/uv:latest@sha256:f6e3549ed287fee0ddde2460a2a74a2d74366f84b04aaa34c1f19fec40da8652 /uv /uvx /bin/
 
 # Install dependencies
 # 1. git (required for caldav dependency from git)