diff --git a/.rubocop.yml b/.rubocop.yml
index 0fdf135..07584c0 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -41,3 +41,7 @@ NumericLiterals:
 
 IfUnlessModifier:
   Enabled: false
+
+# false positive
+LiteralInInterpolation:
+  Enabled: false
diff --git a/lib/r509/cert/extensions/base.rb b/lib/r509/cert/extensions/base.rb
index add0bd7..b20d9dd 100644
--- a/lib/r509/cert/extensions/base.rb
+++ b/lib/r509/cert/extensions/base.rb
@@ -18,7 +18,7 @@ def self.wrap_openssl_extensions(extensions)
         r509_extensions = {}
         extensions.each do |openssl_extension|
           R509_EXTENSION_CLASSES.each do |r509_class|
-            if ( r509_class::OID.downcase == openssl_extension.oid.downcase)
+            if  r509_class::OID.downcase == openssl_extension.oid.downcase
               if r509_extensions.key?(r509_class)
                 raise ArgumentError, "Only one extension object allowed per OID"
               end
@@ -39,7 +39,7 @@ def self.get_unknown_extensions(extensions)
         extensions.each do |openssl_extension|
           match_found = false
           R509_EXTENSION_CLASSES.each do |r509_class|
-            if ( r509_class::OID.downcase == openssl_extension.oid.downcase)
+            if  r509_class::OID.downcase == openssl_extension.oid.downcase
               match_found = true
               break
             end
diff --git a/lib/r509/config/ca_config.rb b/lib/r509/config/ca_config.rb
index e6cf4d4..eec04d2 100644
--- a/lib/r509/config/ca_config.rb
+++ b/lib/r509/config/ca_config.rb
@@ -120,12 +120,12 @@ def initialize(opts = {})
 
       # @return [R509::Cert] either a custom OCSP cert or the ca_cert
       def ocsp_cert
-        if @ocsp_cert.nil? then @ca_cert else @ocsp_cert end
+        (@ocsp_cert.nil?) ? @ca_cert : @ocsp_cert
       end
 
       # @return [R509::Cert] either a custom CRL cert or the ca_cert
       def crl_cert
-        if @crl_cert.nil? then @ca_cert else @crl_cert end
+        (@crl_cert.nil?) ? @ca_cert : @crl_cert
       end
 
       # @param [String] name The name of the profile
diff --git a/lib/r509/csr.rb b/lib/r509/csr.rb
index 6d2e071..3754929 100644
--- a/lib/r509/csr.rb
+++ b/lib/r509/csr.rb
@@ -99,7 +99,7 @@ def self.load_from_file(filename)
 
     # @return [OpenSSL::PKey::RSA,OpenSSL::PKey::DSA,OpenSSL::PKey::EC] public key
     def public_key
-      if (@req.kind_of?(OpenSSL::X509::Request)) then
+      if @req.kind_of?(OpenSSL::X509::Request) then
         @req.public_key
       end
     end
diff --git a/spec/cert/extensions/base_spec.rb b/spec/cert/extensions/base_spec.rb
index c365eb2..9b91e75 100644
--- a/spec/cert/extensions/base_spec.rb
+++ b/spec/cert/extensions/base_spec.rb
@@ -33,7 +33,9 @@
   it "should not have failed to map an implemented extension" do
     missing_extensions = []
     @wrappable_extensions.each do |openssl_ext|
-      if (@r509_extensions.select { |r509_class, r509_ext| r509_ext.oid == openssl_ext.oid }) == {} then missing_extensions << openssl_ext.oid end
+      if (@r509_extensions.select { |r509_class, r509_ext| r509_ext.oid == openssl_ext.oid }) == {}
+        missing_extensions << openssl_ext.oid
+      end
     end
 
     missing_extensions.should == []
diff --git a/spec/oid_mapper_spec.rb b/spec/oid_mapper_spec.rb
index 71e05a4..3db7473 100644
--- a/spec/oid_mapper_spec.rb
+++ b/spec/oid_mapper_spec.rb
@@ -21,8 +21,8 @@
     expect { R509::Subject.new [['testOIDName', 'random_oid']] }.to raise_error(OpenSSL::X509::NameError, 'invalid field name')
     expect { R509::Subject.new [['anotherOIDName', 'second_random']] }.to raise_error(OpenSSL::X509::NameError, 'invalid field name')
     R509::OIDMapper.batch_register([
-    { :oid => '1.4.3.2.1.2.3.4.4.4.4', :short_name => 'testOIDName' },
-    { :oid => '1.4.3.2.1.2.5.4.4.4.4', :short_name => 'anotherOIDName' }
+      { :oid => '1.4.3.2.1.2.3.4.4.4.4', :short_name => 'testOIDName' },
+      { :oid => '1.4.3.2.1.2.5.4.4.4.4', :short_name => 'anotherOIDName' }
     ])
     subject_new = R509::Subject.new [['testOIDName', 'random_oid'], ['anotherOIDName', 'second_random']]
     subject_new['testOIDName'].should == 'random_oid'