diff --git a/iban-tools.gemspec b/iban-tools.gemspec
index 5cf3415..69dd71d 100644
--- a/iban-tools.gemspec
+++ b/iban-tools.gemspec
@@ -20,6 +20,6 @@ Gem::Specification.new do |s|
   ]
   s.description  = "Validates IBAN account numbers"
 
-  s.add_development_dependency "rspec", '~> 3.1'
-  s.add_development_dependency "coveralls", '~> 0.7'
+  s.add_development_dependency "rspec", '~> 3.12'
+  s.add_development_dependency "coveralls", '~> 0.8'
 end