diff --git a/.ruby-version b/.ruby-version
index 4d54dadd..c5106e6d 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-4.0.2
+4.0.4
diff --git a/Dockerfile b/Dockerfile
index 84d45858..efbe53f8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:4.0.2 AS base
+FROM ruby:4.0.4 AS base
 
 RUN bundle config set frozen 'true' && \
     bundle config set path '/vendor/bundle'