diff --git a/gulpfile.js b/gulpfile.js
index a47f33459..ee64e0d95 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -2168,8 +2168,10 @@ function packageJson() {
     homepage: DIST_HOMEPAGE,
     bugs: DIST_BUGS_URL,
     license: DIST_LICENSE,
-    dependencies: {
+    optionalDependencies: {
       canvas: "^2.10.1",
+    },
+    dependencies: {
       "web-streams-polyfill": "^3.2.1",
     },
     browser: {