diff --git a/Dockerfile.test b/Dockerfile.test
index 264ab20..74ae395 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -1,4 +1,4 @@
-FROM ruby:3.4.7-slim
+FROM ruby:4.0.5-slim
 
 ARG DEBIAN_CODENAME=trixie