diff --git a/Cargo.toml b/Cargo.toml
index 14d4e10..54003ab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ failure = "0.1.5"
 serde="1"
 serde_derive = "1"
 num-traits = "0.2"
-num-derive = "0.2"
+num-derive = "0.3"
 lazy_static = "1"
 bitflags = "1"