diff --git a/Gemfile b/Gemfile
index ab41e439..56bd1243 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,4 +6,4 @@ gem "rugged", "~> 1.5.1"
 gem "liquid", "~> 5.4"
 
 gem "irb", "~> 1.9", :group => [:development]
-gem "rdoc", "~> 6.4", :group => [:development]
+gem "rdoc", "~> 6.6", :group => [:development]
diff --git a/Gemfile.lock b/Gemfile.lock
index 4dc29781..ddf1abb8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     liquid (5.4.0)
     psych (5.1.1.1)
       stringio
-    rdoc (6.5.0)
+    rdoc (6.6.0)
       psych (>= 4.0.0)
     reline (0.4.1)
       io-console (~> 0.5)
@@ -21,7 +21,7 @@ PLATFORMS
 DEPENDENCIES
   irb (~> 1.9)
   liquid (~> 5.4)
-  rdoc (~> 6.4)
+  rdoc (~> 6.6)
   rugged (~> 1.5.1)
 
 BUNDLED WITH