diff --git a/Gemfile.lock b/Gemfile.lock
index 130746eb286..c5690fc543b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
-    chunky_png (1.3.12)
+    chunky_png (1.3.13)
     colorator (1.1.0)
     commonmarker (0.21.0)
       ruby-enum (~> 0.5)