diff --git a/tofu/.devcontainer/Dockerfile b/tofu/.devcontainer/Dockerfile
index 681edc4..f64e00d 100644
--- a/tofu/.devcontainer/Dockerfile
+++ b/tofu/.devcontainer/Dockerfile
@@ -1,5 +1,5 @@
 # You can pick any Debian/Ubuntu-based image. 😊
-FROM mcr.microsoft.com/vscode/devcontainers/base:trixie
+FROM mcr.microsoft.com/vscode/devcontainers/base:trixie@sha256:b60cd6e70901c42c23dc312b8e0cf2c704cad3acf65c55739ff1ef33a30166d2
 
 # Add OpenTofu repo
 RUN install -m 0755 -d /etc/apt/keyrings \