diff --git a/Cargo.toml b/Cargo.toml
index 56983571..535193b7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ codecov = { repository = "PyO3/pyo3", branch = "master", service = "github" }
 
 [dependencies]
 libc = "0.2.42"
-spin = "0.4.8"
+spin = "0.4.9"
 num-traits = "0.2.5"
 pyo3cls = { path = "pyo3cls", version = "0.4.0" }
 mashup = "0.1.5"
diff --git a/src/objects/exc_impl.rs b/src/objects/exc_impl.rs
index 7667e368..4846764e 100644
--- a/src/objects/exc_impl.rs
+++ b/src/objects/exc_impl.rs
@@ -21,8 +21,6 @@ macro_rules! dot_stringify {
 ///
 /// # Example
 /// ```
-/// #![feature(const_fn, const_ptr_null_mut)]
-///
 /// #[macro_use] extern crate pyo3;
 ///
 /// use pyo3::{Python, PyDict};