diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index b18fd293..c14aef57 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -4,3 +4,7 @@ updates:
     directory: '/'
     schedule:
       interval: 'weekly'
+  - package-ecosystem: 'bundler'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
diff --git a/Gemfile b/Gemfile
index bb0d4de7..afbd5abf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,8 +1,8 @@
 source "https://rubygems.org"
 
 group :development do
-  gem "rake"
+  gem "rake", "13.0.6"
   gem "rake-compiler", "1.2.3"
-  gem "test-unit"
-  gem "test-unit-ruby-core"
+  gem "test-unit", "3.6.1"
+  gem "test-unit-ruby-core", "1.0.1"
 end