diff --git a/ghost/image-transform/package.json b/ghost/image-transform/package.json
index 78b9d166bc..89fcf158a8 100644
--- a/ghost/image-transform/package.json
+++ b/ghost/image-transform/package.json
@@ -27,5 +27,8 @@
     "@tryghost/errors": "^0.1.0",
     "bluebird": "^3.7.2",
     "fs-extra": "^9.0.0"
+  },
+  "optionalDependencies": {
+    "sharp": "^0.25.2"
   }
 }