diff --git a/flop.gemspec b/flop.gemspec
index 66bbbfe..119f482 100644
--- a/flop.gemspec
+++ b/flop.gemspec
@@ -19,9 +19,9 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler', '~> 1.6'
-  spec.add_development_dependency 'rake'
+  spec.add_development_dependency 'rake', '~> 10.0'
 
   spec.add_development_dependency 'minitest', '~> 5.4'
-  spec.add_development_dependency 'minitest-reporters'
-  spec.add_development_dependency 'fakeredis'
+  spec.add_development_dependency 'minitest-reporters', '~> 1.0'
+  spec.add_development_dependency 'fakeredis', '~> 0.5'
 end