diff --git a/lib/mangopay/version.rb b/lib/mangopay/version.rb
index 58eb114..b2fd140 100644
--- a/lib/mangopay/version.rb
+++ b/lib/mangopay/version.rb
@@ -1,3 +1,3 @@
 module MangoPay
-  VERSION = '3.0.11'
+  VERSION = '3.0.12'
 end
diff --git a/mangopay.gemspec b/mangopay.gemspec
index edbcce8..5af9144 100644
--- a/mangopay.gemspec
+++ b/mangopay.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.add_dependency('multi_json', '>= 1.7.7')
 
   s.add_development_dependency('rake', '>= 10.1.0')
-  s.add_development_dependency('rspec', '>= 3.0.0.rc1')
+  s.add_development_dependency('rspec', '>= 3.0.0')
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- spec/*`.split("\n")
diff --git a/spec/mangopay/authorization_token_spec.rb b/spec/mangopay/authorization_token_spec.rb
index 71d80c9..005a7ac 100644
--- a/spec/mangopay/authorization_token_spec.rb
+++ b/spec/mangopay/authorization_token_spec.rb
@@ -54,15 +54,15 @@
 
       file_path = _new_file_storage.file_path
       dir_path = MangoPay.configuration.temp_dir
-      expect(file_path.start_with? dir_path).to be_true
+      expect(file_path.start_with? dir_path).to be(true)
 
       token = MangoPay::AuthorizationToken::Manager.get_token
-      expect(File.exists? file_path).to be_true
+      expect(File.exists? file_path).to be(true)
 
       f = File.open(file_path, File::RDONLY)
       txt = f.read
       f.close
-      expect(txt.include? token['access_token']).to be_true
+      expect(txt.include? token['access_token']).to be(true)
 
       MangoPay::AuthorizationToken::Manager.storage = _default_static_storage # cleanup
     end
diff --git a/spec/mangopay/client_spec.rb b/spec/mangopay/client_spec.rb
index 3b50f4e..ceba78e 100644
--- a/spec/mangopay/client_spec.rb
+++ b/spec/mangopay/client_spec.rb
@@ -10,8 +10,8 @@
 
     it 'refuses the client id' do
       expect { wrong_client['errors'] }.to raise_error { |err|
-        err.should be_a MangoPay::ResponseError
-        err.type.should eq 'param_error'
+        expect(err).to be_a MangoPay::ResponseError
+        expect(err.type).to eq 'param_error'
       }
     end
 
diff --git a/spec/mangopay/kyc_document_spec.rb b/spec/mangopay/kyc_document_spec.rb
index 9ae7426..de8e146 100644
--- a/spec/mangopay/kyc_document_spec.rb
+++ b/spec/mangopay/kyc_document_spec.rb
@@ -49,9 +49,9 @@ def create_page(file)
     it 'fails when input string is not base64-encoded' do
       file = 'any file content...'
       expect { create_page(file) }.to raise_error { |err|
-        err.should be_a MangoPay::ResponseError
-        err.code.should eq '400'
-        err.type.should eq 'param_error'
+        expect(err).to be_a MangoPay::ResponseError
+        expect(err.code).to eq '400'
+        expect(err.type).to eq 'param_error'
       }
     end
   end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index d251929..6dd5b25 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -4,11 +4,14 @@
 require 'fileutils'
 require 'pp'
 
-
-MangoPay.configure do |c|
-  c.preproduction = true
-  c.client_id = 'sdk-unit-tests'
-  c.client_passphrase = 'cqFfFrWfCcb7UadHNxx2C9Lo6Djw8ZduLi7J9USTmu8bhxxpju'
-  c.temp_dir = File.expand_path('../tmp', __FILE__)
-  FileUtils.mkdir_p(c.temp_dir) unless File.directory?(c.temp_dir)
+# (re-called once in configuration_spec)
+def reset_mangopay_configuration
+  MangoPay.configure do |c|
+    c.preproduction = true
+    c.client_id = 'sdk-unit-tests'
+    c.client_passphrase = 'cqFfFrWfCcb7UadHNxx2C9Lo6Djw8ZduLi7J9USTmu8bhxxpju'
+    c.temp_dir = File.expand_path('../tmp', __FILE__)
+    FileUtils.mkdir_p(c.temp_dir) unless File.directory?(c.temp_dir)
+  end
 end
+reset_mangopay_configuration