diff --git a/9.10/bookworm/Dockerfile b/9.10/bookworm/Dockerfile
index 474addc..d7a92fd 100644
--- a/9.10/bookworm/Dockerfile
+++ b/9.10/bookworm/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:bookworm
+FROM debian:bookworm-20260623
 
 ENV LANG=C.UTF-8
 
diff --git a/9.12/bookworm/Dockerfile b/9.12/bookworm/Dockerfile
index 8fa85a1..42005c6 100644
--- a/9.12/bookworm/Dockerfile
+++ b/9.12/bookworm/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:bookworm
+FROM debian:bookworm-20260623
 
 ENV LANG=C.UTF-8
 
diff --git a/9.14/bookworm/Dockerfile b/9.14/bookworm/Dockerfile
index 64ac1f9..91e4458 100644
--- a/9.14/bookworm/Dockerfile
+++ b/9.14/bookworm/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:bookworm
+FROM debian:bookworm-20260623
 
 ENV LANG=C.UTF-8