diff --git a/Gemfile.lock b/Gemfile.lock
index ffd3034a..b5fc4942 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -113,7 +113,7 @@ GEM
     chartkick (3.4.2)
     childprocess (3.0.0)
     chronic (0.10.2)
-    chunky_png (1.3.11)
+    chunky_png (1.4.0)
     climate_control (0.2.0)
     cloudinary (1.11.1)
       aws_cf_signer