diff --git a/postnord.gemspec b/postnord.gemspec
index 31f5493..136f40c 100644
--- a/postnord.gemspec
+++ b/postnord.gemspec
@@ -21,5 +21,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake", ">= 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
-  spec.add_development_dependency "simplecov"
+  spec.add_development_dependency "simplecov", "~> 0.17.1"
 end