diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7bc622df2..61b9be1fe 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -39,7 +39,10 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
 
-      - name: depends
+      - name: bundle config
+        run:  bundle config set --local without development
+
+      - name: bundle install
         run:  bundle install
 
       # Enable the verbose option in mkmf.rb to print the compiling commands.
@@ -154,7 +157,10 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
 
-      - name: depends
+      - name: bundle config
+        run:  bundle config set --local without development
+
+      - name: bundle install
         run:  bundle install
 
       - name: enable mkmf verbose
diff --git a/Gemfile b/Gemfile
index cdd030acd..20ac75669 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,11 +2,14 @@ source "https://rubygems.org"
 
 gemspec
 
-group :development do
+group :test do
   gem "rake"
   gem "rake-compiler"
   gem "test-unit", "~> 3.0", ">= 3.4.6"
   gem "test-unit-ruby-core"
+end
+
+group :development do
   # In the case of Ruby whose rdoc is not a default gem.
   gem "rdoc"
 end