diff --git a/Dockerfile b/Dockerfile
index 2f31d9f..5dee4e1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:22.04 as indexer
+FROM ubuntu:22.04@sha256:1ec65b2719518e27d4d25f104d93f9fac60dc437f81452302406825c46fcc9cb as indexer
 
 RUN apt-get update && apt-get install -y curl libc6-dev python3 build-essential ninja-build git cmake