diff --git a/package-lock.json b/package-lock.json
index b6157617f..aa32ef27a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -50,7 +50,7 @@
         "jsdoc": "3.6.11",
         "json": "^9.0.4",
         "lodash.defaultsdeep": "4.6.1",
-        "pngjs": "3.3.3",
+        "pngjs": "3.4.0",
         "scratch-audio": "1.0.0",
         "scratch-blocks": "1.1.6",
         "scratch-l10n": "3.18.6",
@@ -19072,9 +19072,9 @@
       }
     },
     "node_modules/pngjs": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-3.3.3.tgz",
-      "integrity": "sha512-1n3Z4p3IOxArEs1VRXnZ/RXdfEniAUS9jb68g58FIXMNkPJeZd+Qh4Uq7/e0LVxAQGos1eIUrqrt4FpjdnEd+Q==",
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-3.4.0.tgz",
+      "integrity": "sha512-NCrCHhWmnQklfH4MtJMRjZ2a8c80qXeMlQMv2uVp9ISJMTt562SbGd6n2oq0PaPgKm7Z6pL9E2UlLIhC+SHL3w==",
       "dev": true,
       "engines": {
         "node": ">=4.0.0"
@@ -42315,9 +42315,9 @@
       }
     },
     "pngjs": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-3.3.3.tgz",
-      "integrity": "sha512-1n3Z4p3IOxArEs1VRXnZ/RXdfEniAUS9jb68g58FIXMNkPJeZd+Qh4Uq7/e0LVxAQGos1eIUrqrt4FpjdnEd+Q==",
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-3.4.0.tgz",
+      "integrity": "sha512-NCrCHhWmnQklfH4MtJMRjZ2a8c80qXeMlQMv2uVp9ISJMTt562SbGd6n2oq0PaPgKm7Z6pL9E2UlLIhC+SHL3w==",
       "dev": true
     },
     "portfinder": {
diff --git a/package.json b/package.json
index 585e74c45..4bdb604bf 100644
--- a/package.json
+++ b/package.json
@@ -85,7 +85,7 @@
     "jsdoc": "3.6.11",
     "json": "^9.0.4",
     "lodash.defaultsdeep": "4.6.1",
-    "pngjs": "3.3.3",
+    "pngjs": "3.4.0",
     "scratch-audio": "1.0.0",
     "scratch-blocks": "1.1.6",
     "scratch-l10n": "3.18.6",