diff --git a/dev/sandbox/Dockerfile b/dev/sandbox/Dockerfile
index 59ddf05..6b81a7a 100644
--- a/dev/sandbox/Dockerfile
+++ b/dev/sandbox/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:22.04
+FROM ubuntu:22.04@sha256:c7eb020043d8fc2ae0793fb35a37bff1cf33f156d4d4b12ccc7f3ef8706c38b1
 
 # Prevent interactive prompts during package installation
 ENV DEBIAN_FRONTEND=noninteractive