diff --git a/handwritten/firestore/package.json b/handwritten/firestore/package.json
index 99e404ce694..524d5050c67 100644
--- a/handwritten/firestore/package.json
+++ b/handwritten/firestore/package.json
@@ -83,7 +83,7 @@
     "@opentelemetry/context-async-hooks": "^2.0.1",
     "@opentelemetry/sdk-trace-node": "^2.0.1",
     "@types/assert": "^1.5.11",
-    "@types/chai": "^4.3.20",
+    "@types/chai": "^5.0.0",
     "@types/chai-as-promised": "^7.1.8",
     "@types/duplexify": "^3.6.4",
     "@types/extend": "^3.0.4",
diff --git a/packages/google-cloud-modelarmor/samples/package.json b/packages/google-cloud-modelarmor/samples/package.json
index ad0cd8b461e..e6ed924f5c8 100644
--- a/packages/google-cloud-modelarmor/samples/package.json
+++ b/packages/google-cloud-modelarmor/samples/package.json
@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "c8": "^9.0.0",
-    "chai": "^4.2.0",
+    "chai": "^5.0.0",
     "mocha": "^8.0.0"
   }
 }
diff --git a/packages/google-cloud-webrisk/package.json b/packages/google-cloud-webrisk/package.json
index bc77086be83..241371605ba 100644
--- a/packages/google-cloud-webrisk/package.json
+++ b/packages/google-cloud-webrisk/package.json
@@ -31,7 +31,7 @@
     "google-gax": "^5.0.0"
   },
   "devDependencies": {
-    "@types/chai": "^4.2.7",
+    "@types/chai": "^5.0.0",
     "@types/mocha": "^10.0.10",
     "@types/node": "^22.13.9",
     "@types/sinon": "^17.0.4",