diff --git a/package.json b/package.json
index 18fa2f4eb..a9b1e9912 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
   "devDependencies": {
     "@babel/core": "^7.17.9",
     "@babel/plugin-proposal-class-properties": "^7.16.7",
+    "@babel/plugin-proposal-optional-chaining": "^7.16.7",
     "@babel/preset-env": "^7.16.11",
     "@sampotts/eslint-config": "1.1.7",
     "autoprefixer": "^10.4.4",
diff --git a/tasks/build.js b/tasks/build.js
index a4fc543a2..e7cd88177 100644
--- a/tasks/build.js
+++ b/tasks/build.js
@@ -118,7 +118,7 @@ Object.entries(build.js).forEach(([filename, entry]) => {
                       },
                     ],
                   ],
-                  plugins: ['@babel/plugin-proposal-class-properties'],
+                  plugins: ['@babel/plugin-proposal-class-properties', '@babel/plugin-proposal-optional-chaining'],
                   babelrc: false,
                   exclude: [/\/core-js\//],
                 }),