diff --git a/Dockerfile b/Dockerfile
index 24fde57d..c1fc477e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04 as indexer
+FROM ubuntu:26.04@sha256:f3d28607ddd78734bb7f71f117f3c6706c666b8b76cbff7c9ff6e5718d46ff64 as indexer
 
 RUN apt-get update && apt-get install -y curl libc6-dev python3 build-essential ninja-build git cmake