diff --git a/src/internal/c/Dockerfile b/src/internal/c/Dockerfile
index 4d99cdc9..af7e871e 100644
--- a/src/internal/c/Dockerfile
+++ b/src/internal/c/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:trixie as build
+FROM debian:trixie-20260505 as build
 
 RUN apt-get update && apt-get install -y \
     build-essential \