diff --git a/google-analytics-admin/package.json b/google-analytics-admin/package.json
index 6642f21..c280762 100644
--- a/google-analytics-admin/package.json
+++ b/google-analytics-admin/package.json
@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "c8": "^10.0.0",
-    "chai": "^4.2.0",
+    "chai": "^6.0.0",
     "eslint": "^8.53.0",
     "eslint-config-google": "^0.14.0",
     "mocha": "^11.0.0"
diff --git a/google-analytics-data/package.json b/google-analytics-data/package.json
index fcc7225..bff7d55 100644
--- a/google-analytics-data/package.json
+++ b/google-analytics-data/package.json
@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "c8": "^10.0.0",
-    "chai": "^4.2.0",
+    "chai": "^6.0.0",
     "eslint": "^8.53.0",
     "eslint-config-google": "^0.14.0",
     "mocha": "^11.0.0"