diff --git a/Gemfile.lock b/Gemfile.lock
index 979d695a815..010ac15c813 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,7 @@ GEM
     byebug (11.1.3)
     cbor (0.5.9.6)
     certified (1.0.0)
-    chunky_png (1.3.15)
+    chunky_png (1.4.0)
     coderay (1.1.3)
     colored2 (3.1.2)
     concurrent-ruby (1.1.7)