diff --git a/buildenv b/buildenv
index 49e5be2..6eab6c4 100644
--- a/buildenv
+++ b/buildenv
@@ -1,6 +1,6 @@
 # Update bump details accordingly. Use bump check to confirm.
 # bump: ruby-version /RUBY_VERSION="(.*)"/ https://www.ruby-lang.org/en/downloads/releases/|re:/href=.*?ruby[._-]v?(\d+(?:\.\d+)+)\.t/$1/|semver:*
-RUBY_VERSION="3.4.8" # Specify a stable release
+RUBY_VERSION="4.0.0" # Specify a stable release
 RUBY_MAJOR=$(echo $RUBY_VERSION | cut -d '.' -f 1,2)
 # export ZOPEN_STABLE_TAG="v${RUBY_VERSION}"