diff --git a/openssl/Cargo.toml b/openssl/Cargo.toml
index 5c741d2daffa59dc91394577a933e03ee01da926..b3e0e33472829db2e6096a8984cd06cc9c84f8d4 100644
--- a/openssl/Cargo.toml
+++ b/openssl/Cargo.toml
@@ -8,6 +8,7 @@ repository = "https://github.com/sfackler/rust-openssl"
 readme = "README.md"
 keywords = ["crypto", "tls", "ssl", "dtls"]
 categories = ["cryptography", "api-bindings"]
+edition = "2018"
 
 # these are deprecated and don't do anything anymore
 [features]
diff --git a/systest/Cargo.toml b/systest/Cargo.toml
index bea35574e21bcad95d3b945e6049bcfea53b1738..9f74f97322ede4458f28efb1e23917d054448138 100644
--- a/systest/Cargo.toml
+++ b/systest/Cargo.toml
@@ -2,6 +2,7 @@
 name = "systest"
 version = "0.1.0"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
+edition = "2018"
 
 [dependencies]
 libc = "0.2"