diff --git a/Cargo.toml b/Cargo.toml
index 212f6c43d..93dfb9fa8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,6 +7,7 @@ documentation = "https://docs.rs/ff/"
 homepage = "https://github.com/ebfull/ff"
 license = "MIT/Apache-2.0"
 repository = "https://github.com/ebfull/ff"
+edition = "2018"
 
 [dependencies]
 byteorder = "1"
diff --git a/ff_derive/Cargo.toml b/ff_derive/Cargo.toml
index 914e39258..e822460f6 100644
--- a/ff_derive/Cargo.toml
+++ b/ff_derive/Cargo.toml
@@ -7,6 +7,7 @@ documentation = "https://docs.rs/ff/"
 homepage = "https://github.com/ebfull/ff"
 license = "MIT/Apache-2.0"
 repository = "https://github.com/ebfull/ff"
+edition = "2018"
 
 [lib]
 proc-macro = true