diff --git a/classes/Leaflet.heat/package.json b/classes/Leaflet.heat/package.json
index 372d687..9727753 100644
--- a/classes/Leaflet.heat/package.json
+++ b/classes/Leaflet.heat/package.json
@@ -18,7 +18,7 @@
   },
   "main": "dist/leaflet-heat.js",
   "devDependencies": {
-    "eslint": "^1.7.3",
+    "eslint": "^6.8.0",
     "eslint-config-mourner": "^1.0.1",
     "simpleheat": "~0.2.0",
     "uglify-js": "^2.5.0"