diff --git a/util/memorydb/Cargo.toml b/util/memorydb/Cargo.toml
index f651f92d5..0c2f954e1 100644
--- a/util/memorydb/Cargo.toml
+++ b/util/memorydb/Cargo.toml
@@ -9,7 +9,7 @@ license = "GPL-3.0"
 bigint = "4.0"
 elastic-array = "0.9"
 heapsize = "0.4"
-ethcore-bigint = { version = "0.1.3", path = "../bigint", features = ["heapsizeof"] }
+ethcore-bigint = { version = "0.2", path = "../bigint", features = ["heapsizeof"] }
 hash = { version = "0.1.0", path = "../hash" }
 hashdb = { version = "0.1.0", path = "../hashdb" }
 rlp = { version = "0.2.0", path = "../rlp" }