diff --git a/package.json b/package.json
index 103df01..98d4456 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
   "main": "index.js",
   "version": "0.1.2",
   "dependencies": {
-    "elliptic": "^0.15.12",
+    "elliptic": "=1.0.0",
     "hash.js": "^0.3.2",
     "bs58": "^2.0.0",
     "request": "^2.36.0",