diff --git a/package.json b/package.json
index 4f445858..f4cb5e38 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "@eslint/js": "9.34.0",
     "@rollup/plugin-terser": "0.4.4",
     "@rollup/plugin-typescript": "12.1.4",
-    "@types/chai": "4.3.20",
+    "@types/chai": "5.2.2",
     "@types/mocha": "10.0.10",
     "@types/node": "22.17.2",
     "@types/sinon": "17.0.4",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d40b1adf..685acf7a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -31,8 +31,8 @@ importers:
         specifier: 12.1.4
         version: 12.1.4(rollup@4.47.1)(tslib@2.8.1)(typescript@5.9.2)
       '@types/chai':
-        specifier: 4.3.20
-        version: 4.3.20
+        specifier: 5.2.2
+        version: 5.2.2
       '@types/mocha':
         specifier: 10.0.10
         version: 10.0.10
@@ -468,8 +468,11 @@ packages:
   '@tsconfig/node16@1.0.4':
     resolution: {integrity: sha512-vxhUy4J8lyeyinH7Azl1pdd43GJhZH/tP2weN8TntQblOY+A0XbT8DJk1/oCPuOOyg/Ja757rG0CgHcWC8OfMA==}
 
-  '@types/chai@4.3.20':
-    resolution: {integrity: sha512-/pC9HAB5I/xMlc5FP77qjCnI16ChlJfW0tGa0IUcFn38VJrTV6DeZ60NU5KZBtaOZqjdpwTWohz5HU1RrhiYxQ==}
+  '@types/chai@5.2.2':
+    resolution: {integrity: sha512-8kB30R7Hwqf40JPiKhVzodJs2Qc1ZJ5zuT3uzw5Hq/dhNCl3G3l83jfpdI1e20BP348+fV7VIL/+FxaXkqBmWg==}
+
+  '@types/deep-eql@4.0.2':
+    resolution: {integrity: sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw==}
 
   '@types/eslint-scope@3.7.7':
     resolution: {integrity: sha512-MzMFlSLBqNF2gcHWO0G1vP/YQyfvrxZ0bF+u7mzUdZ1/xK4A4sru+nraZz5i3iEIk1l1uyicaDVTB4QbbEkAYg==}
@@ -2167,7 +2170,11 @@ snapshots:
 
   '@tsconfig/node16@1.0.4': {}
 
-  '@types/chai@4.3.20': {}
+  '@types/chai@5.2.2':
+    dependencies:
+      '@types/deep-eql': 4.0.2
+
+  '@types/deep-eql@4.0.2': {}
 
   '@types/eslint-scope@3.7.7':
     dependencies: