diff --git a/.ruby-version b/.ruby-version
index fa7adc7..47b322c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.5
+3.4.1
diff --git a/flake.nix b/flake.nix
index 0c32fcf..0786f99 100644
--- a/flake.nix
+++ b/flake.nix
@@ -45,7 +45,7 @@
                 nixfmt-rfc-style
                 nil
 
-                ruby_3_3
+                ruby_3_4
                 # Required to build psych via irb dependency
                 # https://github.com/kachick/rspec-matchers-power_assert_matchers/issues/122
                 # https://github.com/ruby/irb/pull/648