diff --git a/Dockerfile b/Dockerfile
index e27d27f741..c0c62aa183 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.3.4
+FROM ruby:3.3.5
 
 RUN apt-get update -qy && apt-get install rsync -qy
 
diff --git a/Dockerfile.rurema-search b/Dockerfile.rurema-search
index e5001fc9f6..b92488da33 100644
--- a/Dockerfile.rurema-search
+++ b/Dockerfile.rurema-search
@@ -1,4 +1,4 @@
-FROM ruby:3.3.4
+FROM ruby:3.3.5
 
 ENV DEBIAN_FRONTEND=noninteractive
 # groonga-suggest-create-dataset がなくて止まるので apt install groonga しておく