diff --git a/Gemfile b/Gemfile
index 07b66bc..9a4619a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,13 +11,12 @@ gemspec
 # checkout the latest version (develop) from github.
 allow_local = ENV['FAVOR_LOCAL_GEMS']
 
-gem 'regexp_parser', '2.9.0'
 # 2.9.1 breaks test_with_openstudio, for more information: https://github.com/NREL/OpenStudio/issues/5203
 # pin this dependency to avoid unicode_normalize error
 gem 'addressable', '2.8.1' # openstudio:test_with_openstudio
 # pin this dependency to avoid using racc dependency (which has native extensions)
 # gem 'parser', '3.2.2.2'
-
+gem 'openstudio-extension', github: 'NREL/openstudio-extension-gem', branch: 'wenyi/patch'
 # if allow_local && File.exist?('../OpenStudio-extension-gem')
 #   gem 'openstudio-extension', path: '../OpenStudio-extension-gem'
 # elsif allow_local
diff --git a/urbanopt-core-gem.gemspec b/urbanopt-core-gem.gemspec
index e9446eb..d3ff553 100644
--- a/urbanopt-core-gem.gemspec
+++ b/urbanopt-core-gem.gemspec
@@ -26,6 +26,4 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rspec', '~> 3.13'
   spec.add_development_dependency 'simplecov', '0.22.0'
   spec.add_development_dependency 'simplecov-lcov', '0.8.0'
-
-  spec.add_dependency 'openstudio-extension', '~> 0.8.1'
 end