diff --git a/Dockerfile b/Dockerfile
index 24fde57d..a47578a1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04 as indexer
+FROM ubuntu:26.04@sha256:b7f48194d4d8b763a478a621cdc81c27be222ba2206ca3ca6bc42b49685f3d9e as indexer
 
 RUN apt-get update && apt-get install -y curl libc6-dev python3 build-essential ninja-build git cmake