diff --git a/.eslintrc.js b/.eslintrc.js
index 7ab7340..3b305de 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,10 +1,10 @@
 module.exports = {
     extends: ['scratch', 'scratch/es6', 'scratch/node'],
-	"globals": {
-		"document": true,
-		"window": true,
-		"DOMParser": true,
-		"Image": true,
-		"XMLSerializer": true,
-	}
+    globals: {
+        document: true,
+        window: true,
+        DOMParser: true,
+        Image: true,
+        XMLSerializer: true
+    }
 };
diff --git a/package.json b/package.json
index 6f73f9c..51da42e 100644
--- a/package.json
+++ b/package.json
@@ -31,11 +31,11 @@
   },
   "devDependencies": {
     "babel-core": "6.26.0",
-    "babel-eslint": "^8.1.2",
+    "babel-eslint": "^10.1.0",
     "babel-loader": "7.1.5",
     "babel-preset-env": "1.6.1",
     "copy-webpack-plugin": "^4.5.1",
-    "eslint": "^4.14.0",
+    "eslint": "^7.13.0",
     "eslint-config-scratch": "^5.0.0",
     "eslint-plugin-import": "^2.12.0",
     "jsdom": "^13.0.0",
diff --git a/src/font-inliner.js b/src/font-inliner.js
index 1f3970b..349add2 100644
--- a/src/font-inliner.js
+++ b/src/font-inliner.js
@@ -36,7 +36,7 @@ const inlineSvgFonts = function (svgString) {
     if (fontsNeeded.size > 0) {
         let str = '<defs><style>';
         for (const font of fontsNeeded) {
-            if (FONTS.hasOwnProperty(font)) {
+            if (Object.prototype.hasOwnProperty.call(FONTS, font)) {
                 str += `${FONTS[font]}`;
             }
         }