diff --git a/packages/firestore/package.json b/packages/firestore/package.json
index c419b21cf53..ff35f543c66 100644
--- a/packages/firestore/package.json
+++ b/packages/firestore/package.json
@@ -100,7 +100,7 @@
     "@types/eslint": "7.29.0",
     "@types/json-stable-stringify": "1.0.34",
     "json-stable-stringify": "1.0.1",
-    "protobufjs": "6.11.2",
+    "protobufjs": "6.11.3",
     "rollup": "2.72.1",
     "rollup-plugin-copy": "3.4.0",
     "rollup-plugin-copy-assets": "2.0.3",
diff --git a/yarn.lock b/yarn.lock
index d0d7dfc9da8..5a1a22b5801 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -13874,6 +13874,25 @@ protobufjs@6.11.2, protobufjs@^6.10.0:
     "@types/node" ">=13.7.0"
     long "^4.0.0"
 
+protobufjs@6.11.3:
+  version "6.11.3"
+  resolved "https://registry.npmjs.org/protobufjs/-/protobufjs-6.11.3.tgz#637a527205a35caa4f3e2a9a4a13ddffe0e7af74"
+  integrity sha512-xL96WDdCZYdU7Slin569tFX712BxsxslWwAfAhCYjQKGTq7dAU91Lomy6nLLhh/dyGhk/YH4TwTSRxTzhuHyZg==
+  dependencies:
+    "@protobufjs/aspromise" "^1.1.2"
+    "@protobufjs/base64" "^1.1.2"
+    "@protobufjs/codegen" "^2.0.4"
+    "@protobufjs/eventemitter" "^1.1.0"
+    "@protobufjs/fetch" "^1.1.0"
+    "@protobufjs/float" "^1.0.2"
+    "@protobufjs/inquire" "^1.1.0"
+    "@protobufjs/path" "^1.1.2"
+    "@protobufjs/pool" "^1.1.0"
+    "@protobufjs/utf8" "^1.1.0"
+    "@types/long" "^4.0.1"
+    "@types/node" ">=13.7.0"
+    long "^4.0.0"
+
 protocols@^1.1.0, protocols@^1.4.0:
   version "1.4.8"
   resolved "https://registry.npmjs.org/protocols/-/protocols-1.4.8.tgz#48eea2d8f58d9644a4a32caae5d5db290a075ce8"