diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f7177d952..38ca3a94a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.1.7", "3.2.9", "3.3.8", "3.4.1", "jruby-9.4"]
+        ruby: ["3.1.7", "3.2.9", "3.3.9", "3.4.1", "jruby-9.4"]
         test_command: ["bundle exec rake test"]
         include:
           - ruby: "head"
@@ -26,7 +26,7 @@ jobs:
             test_command: "bundle exec rake test || true"
           - ruby: "3.2.9"
             test_command: "./ci/run_rubocop_specs || true"
-          - ruby: "3.3.8"
+          - ruby: "3.3.9"
             test_command: "./ci/run_rubocop_specs || true"
           - ruby: "3.4.1"
             test_command: "./ci/run_rubocop_specs || true"
diff --git a/lib/parser/current.rb b/lib/parser/current.rb
index c6491b6f0..714be876c 100644
--- a/lib/parser/current.rb
+++ b/lib/parser/current.rb
@@ -111,7 +111,7 @@ def warn_syntax_deviation(feature, version)
     CurrentRuby = Ruby32
 
   when /^3\.3\./
-    current_version = '3.3.8'
+    current_version = '3.3.9'
     if RUBY_VERSION != current_version
       warn_syntax_deviation 'parser/ruby33', current_version
     end