diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 3683fa3..e609d62 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6
+        ruby-version: 3.1
     - name: Install dependencies
       run: bundle install
     - name: Run tests
diff --git a/Gemfile b/Gemfile
index d18f175..2af156c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,5 +2,5 @@ source 'https://rubygems.org'
 
 group :development, :test do
   gem 'rake'
-  gem 'vim-flavor', '~> 3.0'
+  gem 'vim-flavor', '~> 4.0'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 50e10ee..01e437d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,25 +1,23 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    equatable (0.5.0)
-    parslet (1.8.2)
-    pastel (0.7.2)
-      equatable (~> 0.5.0)
-      tty-color (~> 0.4.0)
+    parslet (2.0.0)
+    pastel (0.8.0)
+      tty-color (~> 0.5)
     rake (13.0.1)
-    thor (0.20.0)
-    tty-color (0.4.2)
-    vim-flavor (3.0.0)
-      parslet (~> 1.8)
+    thor (1.2.1)
+    tty-color (0.6.0)
+    vim-flavor (4.0.2)
+      parslet (>= 1.8, < 3.0)
       pastel (~> 0.7)
-      thor (~> 0.20)
+      thor (>= 0.20, < 2.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   rake
-  vim-flavor (~> 3.0)
+  vim-flavor (~> 4.0)
 
 BUNDLED WITH
    2.1.4