diff --git a/package.json b/package.json
index 425c9894..2eae0ce2 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": "4.3.1",
         "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..4b1f126d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -633,16 +633,16 @@ 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@4.3.1:
+  version "4.3.1"
+  resolved "https://registry.yarnpkg.com/chai/-/chai-4.3.1.tgz#6fc6af447610709818e5c45116207d60b8a49cfd"
+  integrity sha512-JClPZFGRcSl7X8dYzlCJY7v+X1fBA+9Y339Y8EqhBVfp0QC1hTnaf7nMfR+XZ74clkBC64b0iEw2cWKHt3EVqA==
   dependencies:
     assertion-error "^1.1.0"
     check-error "^1.0.2"
     deep-eql "^3.0.1"
     get-func-name "^2.0.0"
-    pathval "^1.1.0"
+    pathval "^1.1.1"
     type-detect "^4.0.5"
 
 chalk@^2.0.0, chalk@^2.3.0, chalk@^2.4.1:
@@ -2920,10 +2920,10 @@ path-to-regexp@^1.7.0:
   dependencies:
     isarray "0.0.1"
 
-pathval@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.0.tgz#b942e6d4bde653005ef6b71361def8727d0645e0"
-  integrity sha1-uULm1L3mUwBe9rcTYd74cn0GReA=
+pathval@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.1.tgz#8534e77a77ce7ac5a2512ea21e0fdb8fcf6c3d8d"
+  integrity sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==
 
 pbkdf2@^3.0.3:
   version "3.1.1"