diff --git a/Cargo.toml b/Cargo.toml
index 91855068..12e326a1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ heapsize = "0.4.2"
 heapsize_derive = "0.1.4"
 hex = "0.3.2"
 itertools = "0.5.9"
-lazy_static = "*"
+lazy_static = "1.2"
 lru = "0.1.8"
 nom = "^3.2.1"
 num = "0.1.36"