diff --git a/package-lock.json b/package-lock.json
index f67fc10de..0a482c9d7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,7 +22,7 @@
         "chai": "^4.2.0",
         "clang-format": "^1.6.0",
         "closure-calculate-chunks": "^3.0.2",
-        "concurrently": "^7.0.0",
+        "concurrently": "^7.4.0",
         "eslint": "^8.4.1",
         "eslint-config-google": "^0.14.0",
         "eslint-plugin-jsdoc": "^39.3.6",
diff --git a/package.json b/package.json
index 1842c70be..af8979de4 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "publish:beta": "gulp publishBeta",
     "recompile": "gulp recompile",
     "release": "gulp gitCreateRC",
-    "start": "http-server ./ -o /tests/playground.html -c-1",
+    "start": "concurrently -n tsc,server \"tsc --watch --preserveWatchOutput --outDir 'build/src' --declarationDir 'build/declarations'\" \"http-server ./ -s -o /tests/playground.html -c-1\"",
     "test": "tests/run_all_tests.sh",
     "test:generators": "tests/scripts/run_generators.sh",
     "test:mocha:interactive": "http-server ./ -o /tests/mocha/index.html -c-1",
@@ -76,7 +76,7 @@
     "chai": "^4.2.0",
     "clang-format": "^1.6.0",
     "closure-calculate-chunks": "^3.0.2",
-    "concurrently": "^7.0.0",
+    "concurrently": "^7.4.0",
     "eslint": "^8.4.1",
     "eslint-config-google": "^0.14.0",
     "eslint-plugin-jsdoc": "^39.3.6",