diff --git a/Gemfile.lock b/Gemfile.lock
index 858cf8620..363b65bc3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -143,7 +143,7 @@ GEM
       activesupport (>= 4.0)
       elasticsearch (>= 2.0.0)
       elasticsearch-dsl
-    chunky_png (1.3.11)
+    chunky_png (1.3.12)
     cld3 (3.3.0)
       ffi (>= 1.1.0, < 1.12.0)
     climate_control (0.2.0)