diff --git a/_gem/README.md b/_gem/README.md
index 277d81cc..6bc26503 100644
--- a/_gem/README.md
+++ b/_gem/README.md
@@ -53,6 +53,7 @@ Following tasks are generated
 * `rake go:testrace`
 * `rake go:fmt`
 * `rake go:build_envs`
+* `rake go:mod_tidy`
 
 #### Example (With config)
 ```ruby
@@ -73,6 +74,7 @@ Following tasks are generated
 * `rake go5:testrace`
 * `rake go5:fmt`
 * `rake go5:build_envs`
+* `rake go5:mod_tidy`
 
 #### Example (Add additional tasks)
 ```ruby
diff --git a/_gem/lib/go_gem/rake_task.rb b/_gem/lib/go_gem/rake_task.rb
index 8310dd06..c872106f 100644
--- a/_gem/lib/go_gem/rake_task.rb
+++ b/_gem/lib/go_gem/rake_task.rb
@@ -96,6 +96,7 @@ def initialize(gem_name)
         define_go_fmt_task
         define_go_build_envs_task
         define_go_build_tag_task
+        define_go_mod_tidy_task
       end
     end
 
@@ -179,5 +180,14 @@ def define_go_build_tag_task
         puts GoGem::Util.ruby_minor_version_build_tag
       end
     end
+
+    def define_go_mod_tidy_task
+      desc "Run #{go_bin_path} mod tidy"
+      task(:mod_tidy) do
+        within_target_dir do
+          sh "#{go_bin_path} mod tidy"
+        end
+      end
+    end
   end
 end
diff --git a/_gem/sig/go_gem/rake_task.rbs b/_gem/sig/go_gem/rake_task.rbs
index b293c777..f7cee731 100644
--- a/_gem/sig/go_gem/rake_task.rbs
+++ b/_gem/sig/go_gem/rake_task.rbs
@@ -42,6 +42,8 @@ module GoGem
 
     def define_go_build_tag_task: () -> void
 
+    def define_go_mod_tidy_task: () -> void
+
     def within_target_dir: () { () -> void } -> void
 
     def ext_dir: () -> String
diff --git a/_gem/spec/go_gem/rake_task_spec.rb b/_gem/spec/go_gem/rake_task_spec.rb
index 2a779b3a..e2ef8375 100644
--- a/_gem/spec/go_gem/rake_task_spec.rb
+++ b/_gem/spec/go_gem/rake_task_spec.rb
@@ -18,6 +18,7 @@
       it { should be_task_defined("go:testrace") }
       it { should be_task_defined("go:fmt") }
       it { should be_task_defined("go:build_envs") }
+      it { should be_task_defined("go:mod_tidy") }
 
       describe "Add additional tasks" do
         include Rake::DSL
@@ -53,6 +54,7 @@
       it { should be_task_defined("go5:test") }
       it { should be_task_defined("go5:testrace") }
       it { should be_task_defined("go5:fmt") }
+      it { should be_task_defined("go5:mod_tidy") }
     end
   end
 end