diff --git a/Dockerfile b/Dockerfile
index 24fde57d..86d38ad1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04 as indexer
+FROM ubuntu:26.04@sha256:513c074113a871b51a8d16ab445c88779d6452d937a164fb5cc479f32668a41d as indexer
 
 RUN apt-get update && apt-get install -y curl libc6-dev python3 build-essential ninja-build git cmake