diff --git a/package.json b/package.json
index 4208fc7..81dc9be 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
     "create-hmac": "^1.1.3",
     "ecurve": "^1.0.0",
     "randombytes": "^2.0.1",
-    "typeforce": "^1.3.0",
+    "typeforce": "^1.5.5",
     "wif": "^1.1.0"
   },
   "devDependencies": {