diff --git a/core/codegen/build.rs b/core/codegen/build.rs
index 75e4a537..8ce97344 100644
--- a/core/codegen/build.rs
+++ b/core/codegen/build.rs
@@ -3,8 +3,8 @@
 use yansi::{Paint, Color::{Red, Yellow, Blue}};
 
 // Specifies the minimum nightly version needed to compile Rocket.
-const MIN_DATE: &'static str = "2019-01-13";
-const MIN_VERSION: &'static str = "1.33.0-nightly";
+const MIN_DATE: &'static str = "2019-12-29";
+const MIN_VERSION: &'static str = "1.42.0-nightly";
 
 macro_rules! err {
     ($version:expr, $date:expr, $msg:expr) => (