diff --git a/rasti-db.gemspec b/rasti-db.gemspec
index f43845c..7eabb89 100644
--- a/rasti-db.gemspec
+++ b/rasti-db.gemspec
@@ -25,7 +25,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'minitest', '~> 5.0'
   spec.add_development_dependency 'minitest-colorin', '~> 0.1'
   spec.add_development_dependency 'simplecov', '~> 0.12'
-  spec.add_development_dependency 'tins', '~> 1.6.0'
   spec.add_development_dependency 'coveralls', '~> 0.8'
   spec.add_development_dependency 'pry-nav', '~> 0.2'
 
@@ -34,4 +33,9 @@ Gem::Specification.new do |spec|
   else
     spec.add_development_dependency 'sqlite3', '~> 1.3'
   end
+
+  if RUBY_VERSION < '2'
+    spec.add_development_dependency 'tins', '~> 1.6.0'
+    spec.add_development_dependency 'json', '~> 1.8'
+  end
 end