diff --git a/lib/omniauth/strategies/salesforce.rb b/lib/omniauth/strategies/salesforce.rb
index 1ca4870..901a8ae 100755
--- a/lib/omniauth/strategies/salesforce.rb
+++ b/lib/omniauth/strategies/salesforce.rb
@@ -33,7 +33,7 @@ def request_phase
 
       def auth_hash
         signed_value = access_token.params['id'] + access_token.params['issued_at']
-        raw_expected_signature = OpenSSL::HMAC.digest('sha256', options.client_secret, signed_value)
+        raw_expected_signature = OpenSSL::HMAC.digest('sha256', options.client_secret.to_s, signed_value)
         expected_signature = Base64.strict_encode64 raw_expected_signature
         signature = access_token.params['signature']
         fail! "Salesforce user id did not match signature!" unless signature == expected_signature
@@ -67,7 +67,7 @@ def auth_hash
       def raw_info
         access_token.options[:mode] = :query
         access_token.options[:param_name] = :oauth_token
-        @raw_info ||= access_token.post(access_token['id']).parsed
+        @raw_info ||= access_token.get(access_token['id']).parsed
       end
 
       extra do
diff --git a/omniauth-salesforce.gemspec b/omniauth-salesforce.gemspec
index c444834..9ed75f9 100755
--- a/omniauth-salesforce.gemspec
+++ b/omniauth-salesforce.gemspec
@@ -15,8 +15,8 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.version       = OmniAuth::Salesforce::VERSION
 
-  gem.add_dependency 'omniauth', '~> 1.0'
-  gem.add_dependency 'omniauth-oauth2', '~> 1.0'
+  gem.add_dependency 'omniauth', '>= 1.2.2'
+  gem.add_dependency 'omniauth-oauth2', '>= 1.3.1'
   gem.add_development_dependency 'rspec', '~> 2.7'
   gem.add_development_dependency 'rack-test'
   gem.add_development_dependency 'simplecov'