diff --git a/pecorino.gemspec b/pecorino.gemspec
index 6fb259d..870800e 100644
--- a/pecorino.gemspec
+++ b/pecorino.gemspec
@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
 
   # Uncomment to register a new dependency of your gem
   spec.add_dependency "activerecord", "~> 7"
-  spec.add_dependency "pg"
+  spec.add_development_dependency "pg"
   spec.add_development_dependency "activesupport", "~> 7.0"
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "minitest", "~> 5.0"