diff --git a/package.json b/package.json
index 86a01af..ec66049 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "ethereumjs-block": "^2.1.0",
     "ethereumjs-tx": "^1.3.3",
     "merkle-patricia-tree": "^3.0.0",
-    "multicodec": "~0.5.0",
+    "multicodec": "^1.0.0",
     "multihashes": "~0.4.12",
     "multihashing-async": "~0.8.0",
     "rlp": "^2.0.0"