diff --git a/package.json b/package.json
index a76527c..d7fbb21 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "defaults": "^1.0.2",
     "mkdirp": "^0.5.1",
     "nightmare": "^2.0.3",
-    "pngjs": "^3.0.1",
+    "pngjs": "^3.4.0",
     "sprintf-js": "^1.0.3",
     "thunkify": "^2.1.2",
     "vo": "^1.0.3"
diff --git a/yarn.lock b/yarn.lock
index 4e03a6c..4687a58 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -774,9 +774,10 @@ pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
-pngjs@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/pngjs/-/pngjs-3.0.1.tgz#b15086ac1ac47298c8fd3f9cdf364fa9879c4db6"
+pngjs@^3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/pngjs/-/pngjs-3.4.0.tgz#99ca7d725965fb655814eaf65f38f12bbdbf555f"
+  integrity sha512-NCrCHhWmnQklfH4MtJMRjZ2a8c80qXeMlQMv2uVp9ISJMTt562SbGd6n2oq0PaPgKm7Z6pL9E2UlLIhC+SHL3w==
 
 pretty-bytes@^1.0.2:
   version "1.0.4"