diff --git a/package.json b/package.json
index 13285e02..6ab4fea2 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "elliptic": "^6.4.0",
     "ethereumjs-abi": "^0.6.8",
     "ethereumjs-util": "^5.1.1",
-    "tweetnacl": "^1.0.0",
+    "tweetnacl": "^1.0.3",
     "tweetnacl-util": "^0.15.0"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index a8c93245..a2ede594 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1731,10 +1731,10 @@ tweetnacl-util@^0.15.0:
   resolved "https://registry.yarnpkg.com/tweetnacl-util/-/tweetnacl-util-0.15.0.tgz#4576c1cee5e2d63d207fee52f1ba02819480bc75"
   integrity sha1-RXbBzuXi1j0gf+5S8boCgZSAvHU=
 
-tweetnacl@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-1.0.0.tgz#713d8b818da42068740bf68386d0479e66fc8a7b"
-  integrity sha1-cT2LgY2kIGh0C/aDhtBHnmb8ins=
+tweetnacl@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-1.0.3.tgz#ac0af71680458d8a6378d0d0d050ab1407d35596"
+  integrity sha512-6rt+RN7aOi1nGMyC4Xa5DdYiukl2UWCbcJft7YhxReBGQD7OAM8Pbxw6YMo4r2diNEA8FEmu32YOn9rhaiE5yw==
 
 type-check@~0.3.2:
   version "0.3.2"