diff --git a/Gemfile b/Gemfile
index 42acf7e..171bdf0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem "rake", "~> 12.3.3"
 group :development do
   gem "rspec", "~> 2.14.1"
   gem "rdoc", "~> 4.1.1"
-  gem "bundler", "~> 1.0"
+  gem "bundler", "~> 4.0"
   gem "jeweler", "~> 2.0.1"
   gem "simplecov", "~> 0.8.1"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 6bdd469..a16d297 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -70,7 +70,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (~> 1.0)
+  bundler (~> 4.0)
   jeweler (~> 2.0.1)
   mysql
   rake (~> 12.3.3)
@@ -78,3 +78,6 @@ DEPENDENCIES
   rspec (~> 2.14.1)
   sequel (~> 4.10.0)
   simplecov (~> 0.8.1)
+
+BUNDLED WITH
+   4.0.16