diff --git a/lecture_09/example-01/phonebook/package-lock.json b/lecture_09/example-01/phonebook/package-lock.json
index 3585602..3b6ce22 100644
--- a/lecture_09/example-01/phonebook/package-lock.json
+++ b/lecture_09/example-01/phonebook/package-lock.json
@@ -10423,9 +10423,9 @@
       "integrity": "sha1-fjL3W0E4EpHQRhHxvxQQmsAGUdc="
     },
     "qs": {
-      "version": "6.9.1",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-6.9.1.tgz",
-      "integrity": "sha512-Cxm7/SS/y/Z3MHWSxXb8lIFqgqBowP5JMlTUFyJN88y0SGQhVmZnqFK/PeuMX9LzUyWsqqhNxIyg0jlzq946yA=="
+      "version": "6.9.7",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.9.7.tgz",
+      "integrity": "sha512-IhMFgUmuNpyRfxA90umL7ByLlgRXu6tIfKPpF5TmcfRLlLCckfP/g3IQmju6jjpu+Hh8rA+2p6A27ZSPOOHdKw=="
     },
     "query-string": {
       "version": "4.3.4",
diff --git a/lecture_09/example-01/phonebook/package.json b/lecture_09/example-01/phonebook/package.json
index 5685a8a..3af0c8f 100644
--- a/lecture_09/example-01/phonebook/package.json
+++ b/lecture_09/example-01/phonebook/package.json
@@ -4,7 +4,7 @@
   "private": true,
   "dependencies": {
     "axios": "^0.19.0",
-    "qs": "^6.9.1",
+    "qs": "^6.9.7",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
     "react-router-dom": "^5.1.2",
diff --git a/lecture_09/example-01/phonebook/yarn.lock b/lecture_09/example-01/phonebook/yarn.lock
index 9ef36ee..93488a2 100644
--- a/lecture_09/example-01/phonebook/yarn.lock
+++ b/lecture_09/example-01/phonebook/yarn.lock
@@ -8653,10 +8653,10 @@ qs@6.5.2, qs@~6.5.2:
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.5.2.tgz#cb3ae806e8740444584ef154ce8ee98d403f3e36"
   integrity sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==
 
-qs@^6.9.1:
-  version "6.9.1"
-  resolved "https://registry.yarnpkg.com/qs/-/qs-6.9.1.tgz#20082c65cb78223635ab1a9eaca8875a29bf8ec9"
-  integrity sha512-Cxm7/SS/y/Z3MHWSxXb8lIFqgqBowP5JMlTUFyJN88y0SGQhVmZnqFK/PeuMX9LzUyWsqqhNxIyg0jlzq946yA==
+qs@^6.9.7:
+  version "6.9.7"
+  resolved "https://registry.yarnpkg.com/qs/-/qs-6.9.7.tgz#4610846871485e1e048f44ae3b94033f0e675afe"
+  integrity sha512-IhMFgUmuNpyRfxA90umL7ByLlgRXu6tIfKPpF5TmcfRLlLCckfP/g3IQmju6jjpu+Hh8rA+2p6A27ZSPOOHdKw==
 
 query-string@^4.1.0:
   version "4.3.4"