diff --git a/Dockerfile b/Dockerfile
index 2f31d9f8..f1392f05 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:22.04 as indexer
+FROM ubuntu:22.04@sha256:1aa979d85661c488ce030ac292876cf6ed04535d3a237e49f61542d8e5de5ae0 as indexer
 
 RUN apt-get update && apt-get install -y curl libc6-dev python3 build-essential ninja-build git cmake