diff --git a/.ruby-version b/.ruby-version
index 47b322c9..4d9d11cf 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.1
+3.4.2
diff --git a/Dockerfile b/Dockerfile
index 644df6cf..b5e0804a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG RUBY_VERSION=3.4.1
+ARG RUBY_VERSION=3.4.2
 ARG NODE_VERSION=22.7.0
 
 # Use Node image so we can pull the binaries from here.
diff --git a/Dockerfile.dev b/Dockerfile.dev
index 524538c2..30916f82 100644
--- a/Dockerfile.dev
+++ b/Dockerfile.dev
@@ -1,4 +1,4 @@
-ARG RUBY_VERSION=3.4.1
+ARG RUBY_VERSION=3.4.2
 ARG NODE_VERSION=22.7.0
 
 # Use Node image so we can pull the binaries from here.