diff --git a/demos/grpc-browser/package-lock.json b/demos/grpc-browser/package-lock.json
index c88992a..31cb8b7 100644
--- a/demos/grpc-browser/package-lock.json
+++ b/demos/grpc-browser/package-lock.json
@@ -1740,9 +1740,9 @@
       }
     },
     "google-protobuf": {
-      "version": "3.15.1",
-      "resolved": "https://registry.npmjs.org/google-protobuf/-/google-protobuf-3.15.1.tgz",
-      "integrity": "sha512-Ss2fADC0TpZXn6bqGgPJMUWoD1y9J7BTtJRVvf+quNxXRtQnrpubiFCdgoown+OetNsU4H3YbJgnpxYY/3kH6g==",
+      "version": "3.15.6",
+      "resolved": "https://registry.npmjs.org/google-protobuf/-/google-protobuf-3.15.6.tgz",
+      "integrity": "sha512-p65NyhIZFHFUxbIPOm6cygg2rCjK+2uDCxruOG3RaWKM9R4rBGX0STmlJoSOhoyAG8Fha7U8FP4pQomAV1JXsA==",
       "dev": true
     },
     "graceful-fs": {
diff --git a/demos/grpc-browser/package.json b/demos/grpc-browser/package.json
index 2d78754..6735332 100644
--- a/demos/grpc-browser/package.json
+++ b/demos/grpc-browser/package.json
@@ -14,7 +14,7 @@
     "grpc-web": "^1.2.1"
   },
   "devDependencies": {
-    "google-protobuf": "^3.15.1",
+    "google-protobuf": "^3.15.6",
     "webpack": "^5.23.0",
     "webpack-cli": "^4.5.0",
     "webpack-dev-server": "^3.11.2"