diff --git a/Cargo.toml b/Cargo.toml
index dfe0840..a70ac77 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "sct"
 version = "0.5.0"
+edition = "2018"
 authors = ["Joseph Birr-Pixton <jpixton@gmail.com>"]
 description = "Certificate transparency SCT verification library"
 license = "Apache-2.0/ISC/MIT"
diff --git a/src/lib.rs b/src/lib.rs
index f3b80a5..2924119 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,9 +17,6 @@
         unused_extern_crates,
         unused_qualifications)]
 
-extern crate ring;
-extern crate untrusted;
-
 /// Describes a CT log
 ///
 /// This structure contains some metadata fields not used by the library.