diff --git a/Dockerfile b/Dockerfile
index 24fde57d..082e0b56 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04 as indexer
+FROM ubuntu:26.04@sha256:53958ec7b67c2c9355df922dd08dbf0360611f8c3cdb656875e81873db9ffdba as indexer
 
 RUN apt-get update && apt-get install -y curl libc6-dev python3 build-essential ninja-build git cmake