diff --git a/env_json.gemspec b/env_json.gemspec
index 37e5935..4501a0d 100644
--- a/env_json.gemspec
+++ b/env_json.gemspec
@@ -25,8 +25,8 @@ Gem::Specification.new do |spec|
   spec.executables   = []
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 1.10"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "bundler"
+  spec.add_development_dependency "rake", "~> 12.3.3"
   spec.add_development_dependency "minitest"
   spec.add_development_dependency "simplecov"
   spec.add_development_dependency "simplecov-rcov"
diff --git a/lib/env_json/version.rb b/lib/env_json/version.rb
index 96ed283..fae1888 100644
--- a/lib/env_json/version.rb
+++ b/lib/env_json/version.rb
@@ -1,4 +1,4 @@
 module EnvJson
   # EnvJson version
-  VERSION = "0.3.0"
+  VERSION = "0.3.1"
 end