diff --git a/Gemfile b/Gemfile
index 0461dab1..5f929b7b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,3 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 # Specify your gem's dependencies in solid_queue.gemspec.
 gemspec
-
-gem "mysql2"
-gem "pg"
-gem "sqlite3"
diff --git a/solid_queue.gemspec b/solid_queue.gemspec
index 0d92a2db..a4e90c10 100644
--- a/solid_queue.gemspec
+++ b/solid_queue.gemspec
@@ -26,4 +26,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "debug"
   spec.add_development_dependency "mocha"
   spec.add_development_dependency "puma"
+  spec.add_development_dependency "mysql2"
+  spec.add_development_dependency "pg"
+  spec.add_development_dependency "sqlite3"
 end