diff --git a/pk-mobx/package.json b/pk-mobx/package.json
index 01f0d79..2874cc9 100644
--- a/pk-mobx/package.json
+++ b/pk-mobx/package.json
@@ -16,7 +16,7 @@
     "@testing-library/jest-dom": "^5.11.2",
     "@testing-library/react": "^10.4.7",
     "@testing-library/user-event": "^7.1.2",
-    "@types/chai": "^4.2.11",
+    "@types/chai": "^4.2.16",
     "@types/jest": "^24.0.0",
     "@types/node": "^14.0.26",
     "@types/react": "^16.9.0",
diff --git a/pk-mst/package.json b/pk-mst/package.json
index eb5b562..cfce550 100644
--- a/pk-mst/package.json
+++ b/pk-mst/package.json
@@ -15,7 +15,7 @@
     "@testing-library/jest-dom": "^5.11.2",
     "@testing-library/react": "^9.3.2",
     "@testing-library/user-event": "^7.1.2",
-    "@types/chai": "^4.2.11",
+    "@types/chai": "^4.2.16",
     "@types/jest": "^24.0.0",
     "@types/node": "^12.0.0",
     "@types/react": "^16.9.0",
diff --git a/pk-react/package.json b/pk-react/package.json
index 38a22a6..dd4910b 100644
--- a/pk-react/package.json
+++ b/pk-react/package.json
@@ -13,7 +13,7 @@
     "@testing-library/jest-dom": "^5.11.2",
     "@testing-library/react": "^10.4.7",
     "@testing-library/user-event": "^7.1.2",
-    "@types/chai": "^4.2.11",
+    "@types/chai": "^4.2.16",
     "@types/jest": "^24.0.0",
     "@types/node": "^14.0.26",
     "@types/react": "^16.9.0",
diff --git a/yarn.lock b/yarn.lock
index faa00e0..8fb229a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1557,10 +1557,10 @@
   dependencies:
     "@babel/types" "^7.3.0"
 
-"@types/chai@^4.2.11":
-  version "4.2.11"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.11.tgz#d3614d6c5f500142358e6ed24e1bf16657536c50"
-  integrity sha512-t7uW6eFafjO+qJ3BIV2gGUyZs27egcNRkUdalkud+Qa3+kg//f129iuOFivHDXQ+vnU3fDXuwgv0cqMCbcE8sw==
+"@types/chai@^4.2.16":
+  version "4.2.16"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.16.tgz#f09cc36e18d28274f942e7201147cce34d97e8c8"
+  integrity sha512-vI5iOAsez9+roLS3M3+Xx7w+WRuDtSmF8bQkrbcIJ2sC1PcDgVoA0WGpa+bIrJ+y8zqY2oi//fUctkxtIcXJCw==
 
 "@types/color-name@^1.1.1":
   version "1.1.1"