diff --git a/README.md b/README.md
index c56f34f..874b782 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,9 @@ Vesper has been influenced by the kernels in L4 family, notably seL4. Fawn and N
 
 ## Build instructions
 
-Use at least rustc nightly 2020-09-30 with cargo nightly of the same or later date. It adds support for `cargo build --build-std` feature (since 2020-07-15) and support for compiler_builtins memory operations ([since 2020-09-30](https://github.com/rust-lang/rust/pull/77284)).
+MSRV: 1.61.0
+
+We require `cargo build --build-std` feature (since 2020-07-15), compiler_builtins memory operations ([since 2020-09-30](https://github.com/rust-lang/rust/pull/77284)) and `const_fn_fn_ptr_basics` feature (stable since Rust 1.61.0).
 
 * Install tools: `cargo install just cargo-make`.
 * Install qemu (at least version 4.1.1): `brew install qemu`.
diff --git a/machine/src/lib.rs b/machine/src/lib.rs
index 02c1b2d..c4b38a7 100644
--- a/machine/src/lib.rs
+++ b/machine/src/lib.rs
@@ -3,7 +3,6 @@
 #![feature(decl_macro)]
 #![feature(allocator_api)]
 #![feature(format_args_nl)]
-#![feature(const_fn_fn_ptr_basics)]
 #![feature(nonnull_slice_from_raw_parts)]
 #![feature(custom_test_frameworks)]
 #![test_runner(crate::tests::test_runner)]