diff --git a/lib/arbor/api.rb b/lib/arbor/api.rb
index 7e9743a..96423ad 100644
--- a/lib/arbor/api.rb
+++ b/lib/arbor/api.rb
@@ -25,7 +25,7 @@ def changelog(type, from_revision = 0)
 
       data['changes'].each do |c|
         c['entityType'] = "change"
-        @highest_revision = [highest_revision, BigDecimal.new(c['toRevision'])].max
+        @highest_revision = [highest_revision, BigDecimal(c['toRevision'])].max
       end
 
       unmarshall_data(data, 'changes')