diff --git a/phf/src/lib.rs b/phf/src/lib.rs
index 8bf2a689..86d26da2 100644
--- a/phf/src/lib.rs
+++ b/phf/src/lib.rs
@@ -3,8 +3,8 @@
 //! Keys can be string literals, byte string literals, byte literals, char
 //! literals, or any of the fixed-size isizeegral types.
 #![doc(html_root_url="https://sfackler.github.io/doc")]
+#![feature(core)]
 #![warn(missing_docs)]
-#![allow(unstable)]
 #![no_std]
 
 #[macro_use]
diff --git a/phf/tests/test.rs b/phf/tests/test.rs
index ed3647e8..35cd893f 100644
--- a/phf/tests/test.rs
+++ b/phf/tests/test.rs
@@ -1,5 +1,4 @@
-#![allow(unstable)]
-#![feature(plugin)]
+#![feature(plugin, collections, core)]
 
 #[plugin] #[no_link]
 extern crate phf_macros;
diff --git a/phf_macros/src/lib.rs b/phf_macros/src/lib.rs
index daea2a1e..3761949b 100644
--- a/phf_macros/src/lib.rs
+++ b/phf_macros/src/lib.rs
@@ -2,8 +2,7 @@
 //!
 //! See the documentation for the `phf` crate for more details.
 #![doc(html_root_url="http://sfackler.github.io/doc")]
-#![feature(plugin_registrar, quote)]
-#![allow(unknown_features, unstable)]
+#![feature(plugin_registrar, quote, rustc_private, std_misc, rand, hash, core, os)]
 
 extern crate rand;
 extern crate syntax;
diff --git a/phf_shared/src/lib.rs b/phf_shared/src/lib.rs
index 1cb67e34..28d43f64 100644
--- a/phf_shared/src/lib.rs
+++ b/phf_shared/src/lib.rs
@@ -1,4 +1,4 @@
-#![allow(unstable)]
+#![feature(core, hash)]
 #![no_std]
 extern crate core;