diff --git a/package.json b/package.json
index 425c9894..000bae68 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
         "@typechain/web3-v1": "1.0.0",
         "@types/bn.js": "4.11.6",
         "@types/node": "^10.14.5",
-        "chai": "4.2.0",
+        "chai": "4.3.0",
         "chai-as-promised": "7.1.1",
         "chai-exclude": "2.0.2",
         "cross-env": "7.0",
diff --git a/yarn.lock b/yarn.lock
index 9e3478d8..2762e572 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -633,10 +633,10 @@ chai-exclude@2.0.2:
   dependencies:
     fclone "^1.0.11"
 
-chai@4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/chai/-/chai-4.2.0.tgz#760aa72cf20e3795e84b12877ce0e83737aa29e5"
-  integrity sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==
+chai@4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/chai/-/chai-4.3.0.tgz#5523a5faf7f819c8a92480d70a8cccbadacfc25f"
+  integrity sha512-/BFd2J30EcOwmdOgXvVsmM48l0Br0nmZPlO0uOW4XKh6kpsUumRXBgPV+IlaqFaqr9cYbeoZAM1Npx0i4A+aiA==
   dependencies:
     assertion-error "^1.1.0"
     check-error "^1.0.2"