diff --git a/.python-version b/.python-version
index d9506ceba5..35f236d6e5 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.12.5
+3.12.6
diff --git a/Dockerfile b/Dockerfile
index 82b0283be3..d5c9d4320a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.12.5-slim AS base
+FROM python:3.12.6-slim AS base
 
 # バージョン情報に表示する commit hash を埋め込む
 FROM base AS commit-hash