diff --git a/circle.yml b/circle.yml
index 056ed60..031fc6a 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,10 +1,10 @@
 machine:
   node:
-    version: v0.12.16
+    version: v6
 
 dependencies:
   pre:
-    - npm install -g npm@2.15.11
+    - npm install -g npm@4.x.x
   override:
     - npm install
 
diff --git a/src/adapters/refract/getUriParameters.coffee b/src/adapters/refract/getUriParameters.coffee
index 6b123ac..48e4f76 100644
--- a/src/adapters/refract/getUriParameters.coffee
+++ b/src/adapters/refract/getUriParameters.coffee
@@ -8,8 +8,8 @@ getUriParameters = (hrefVariables, options) ->
 
   hrefVariables.content.map((hrefVariable) ->
     typeAttributes = hrefVariable.attributes.get('typeAttributes')?.toValue()
-    required = typeAttributes?.contains('required') || false
-    
+    required = typeAttributes?.contains('required') or false
+
     title = hrefVariable.title.toValue()
     key = hrefVariable.key.toValue()
     value = hrefVariable.value