diff --git a/build/package/Dockerfile b/build/package/Dockerfile
index 37c72b3..1b8f980 100644
--- a/build/package/Dockerfile
+++ b/build/package/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04
+FROM ubuntu:26.04
 LABEL maintainer "WATARU MISHIMA <w.mishima@ntt.com>"
 
 # Install packages