diff --git a/Gemfile.lock b/Gemfile.lock
index 4a9684644f83..2bcc5b1c364d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
-    chunky_png (1.3.8)
+    chunky_png (1.3.13)
     coderay (1.1.1)
     colorator (1.1.0)
     compass (0.12.7)