diff --git a/Cargo.toml b/Cargo.toml
index 70521e7fb..f21e4e11c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,6 +7,7 @@ license = "MIT/Apache-2.0"
 name = "bellman"
 repository = "https://github.com/ebfull/bellman"
 version = "0.1.0"
+edition = "2018"
 
 [dependencies]
 bit-vec = "0.4.4"