diff --git a/aio/package.json b/aio/package.json
index da4657991468b..e41d0b9b19289 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -141,7 +141,7 @@
     "jsdom": "^9.12.0",
     "json-schema-traverse": "^0.4.1",
     "json5": "^1.0.1",
-    "karma": "~5.2.3",
+    "karma": "~5.1.1",
     "karma-chrome-launcher": "^3.1.0",
     "karma-coverage": "~2.0.3",
     "karma-jasmine": "~4.0.0",
diff --git a/aio/yarn.lock b/aio/yarn.lock
index 437a99d4065fe..901f9d79aef7f 100644
--- a/aio/yarn.lock
+++ b/aio/yarn.lock
@@ -3448,21 +3448,6 @@ chokidar@^3.4.1:
   optionalDependencies:
     fsevents "~2.1.2"
 
-chokidar@^3.4.2:
-  version "3.4.3"
-  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-3.4.3.tgz#c1df38231448e45ca4ac588e6c79573ba6a57d5b"
-  integrity sha512-DtM3g7juCXQxFVSNPNByEC2+NImtBuxQQvWlHunpJIS5Ocr0lG306cC7FCi7cEA0fzmybPUIl4txBIobk1gGOQ==
-  dependencies:
-    anymatch "~3.1.1"
-    braces "~3.0.2"
-    glob-parent "~5.1.0"
-    is-binary-path "~2.1.0"
-    is-glob "~4.0.1"
-    normalize-path "~3.0.0"
-    readdirp "~3.5.0"
-  optionalDependencies:
-    fsevents "~2.1.2"
-
 chownr@^1.1.1, chownr@^1.1.2:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.1.4.tgz#6fc9d7b42d32a583596337666e7d08084da2cc6b"
@@ -5971,7 +5956,7 @@ flatmap@0.0.3:
   resolved "https://registry.yarnpkg.com/flatmap/-/flatmap-0.0.3.tgz#1f18a4d938152d495965f9c958d923ab2dd669b4"
   integrity sha1-Hxik2TgVLUlZZfnJWNkjqy3WabQ=
 
-flatted@^2.0.1:
+flatted@^2.0.1, flatted@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.2.tgz#4575b21e2bcee7434aa9be662f4b7b5f9c2b5138"
   integrity sha512-r5wGx7YeOwNWNlCA0wQ86zKyDLMQr+/RB8xy74M4hTphfmjlijTSSXGuH8rnvKZnfT9i+75zmd8jcKdMR4O6jA==
@@ -8226,23 +8211,24 @@ karma-source-map-support@1.4.0:
   dependencies:
     source-map-support "^0.5.5"
 
-karma@~5.2.3:
-  version "5.2.3"
-  resolved "https://registry.yarnpkg.com/karma/-/karma-5.2.3.tgz#3264024219bad2728e92542e0058a2492d7a46e4"
-  integrity sha512-tHdyFADhVVPBorIKCX8A37iLHxc6RBRphkSoQ+MLKdAtFn1k97tD8WUGi1KlEtDZKL3hui0qhsY9HXUfSNDYPQ==
+karma@~5.1.1:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/karma/-/karma-5.1.1.tgz#4e472c1e5352d73edbd2090726afdb01d7869d72"
+  integrity sha512-xAlOr5PMqUbiKXSv5PCniHWV3aiwj6wIZ0gUVcwpTCPVQm/qH2WAMFWxtnpM6KJqhkRWrIpovR4Rb0rn8GtJzQ==
   dependencies:
     body-parser "^1.19.0"
     braces "^3.0.2"
-    chokidar "^3.4.2"
+    chokidar "^3.0.0"
     colors "^1.4.0"
     connect "^3.7.0"
     di "^0.0.1"
     dom-serialize "^2.2.1"
+    flatted "^2.0.2"
     glob "^7.1.6"
     graceful-fs "^4.2.4"
     http-proxy "^1.18.1"
     isbinaryfile "^4.0.6"
-    lodash "^4.17.19"
+    lodash "^4.17.15"
     log4js "^6.2.1"
     mime "^2.4.5"
     minimatch "^3.0.4"
@@ -8252,7 +8238,7 @@ karma@~5.2.3:
     socket.io "^2.3.0"
     source-map "^0.6.1"
     tmp "0.2.1"
-    ua-parser-js "0.7.22"
+    ua-parser-js "0.7.21"
     yargs "^15.3.1"
 
 keyv@^3.0.0:
@@ -8696,7 +8682,7 @@ lodash@^4.0.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.1
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
   integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
 
-lodash@^4.17.19:
+lodash@^4.17.15, lodash@^4.17.19:
   version "4.17.20"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.20.tgz#b44a9b6297bcb698f1c51a3545a2b3b368d59c52"
   integrity sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==
@@ -11351,13 +11337,6 @@ readdirp@~3.4.0:
   dependencies:
     picomatch "^2.2.1"
 
-readdirp@~3.5.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-3.5.0.tgz#9ba74c019b15d365278d2e91bb8c48d7b4d42c9e"
-  integrity sha512-cMhu7c/8rdhkHXWsY+osBhfSy0JikwpHK/5+imo+LpeasTF8ouErHrlYkwT0++njiyuDvc7OFY5T3ukvZ8qmFQ==
-  dependencies:
-    picomatch "^2.2.1"
-
 readline2@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/readline2/-/readline2-1.0.1.tgz#41059608ffc154757b715d9989d199ffbf372e35"
@@ -13694,10 +13673,10 @@ typescript@~4.0.2:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.3.tgz#153bbd468ef07725c1df9c77e8b453f8d36abba5"
   integrity sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg==
 
-ua-parser-js@0.7.22:
-  version "0.7.22"
-  resolved "https://registry.yarnpkg.com/ua-parser-js/-/ua-parser-js-0.7.22.tgz#960df60a5f911ea8f1c818f3747b99c6e177eae3"
-  integrity sha512-YUxzMjJ5T71w6a8WWVcMGM6YWOTX27rCoIQgLXiWaxqXSx9D7DNjiGWn1aJIRSQ5qr0xuhra77bSIh6voR/46Q==
+ua-parser-js@0.7.21:
+  version "0.7.21"
+  resolved "https://registry.yarnpkg.com/ua-parser-js/-/ua-parser-js-0.7.21.tgz#853cf9ce93f642f67174273cc34565ae6f308777"
+  integrity sha512-+O8/qh/Qj8CgC6eYBVBykMrNtp5Gebn4dlGD/kKXVkJNDwyrAwSIqwz8CDf+tsAIWVycKcku6gIXJ0qwx/ZXaQ==
 
 uberproto@^1.1.0:
   version "1.2.0"