diff --git a/embassy-embedded-hal/build.rs b/embassy-embedded-hal/build.rs
deleted file mode 100644
index 78bd27ec7..000000000
--- a/embassy-embedded-hal/build.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-use std::env;
-use std::ffi::OsString;
-use std::process::Command;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-
-    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
-
-    let output = Command::new(rustc)
-        .arg("--version")
-        .output()
-        .expect("failed to run `rustc --version`");
-
-    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
-        println!("cargo:rustc-cfg=nightly");
-    }
-}
diff --git a/embassy-embedded-hal/src/lib.rs b/embassy-embedded-hal/src/lib.rs
index b40f892f4..ee974324b 100644
--- a/embassy-embedded-hal/src/lib.rs
+++ b/embassy-embedded-hal/src/lib.rs
@@ -1,6 +1,4 @@
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(nightly, feature(async_fn_in_trait, impl_trait_projections))]
-#![cfg_attr(nightly, allow(stable_features, unknown_lints))]
 #![allow(async_fn_in_trait)]
 #![warn(missing_docs)]
 
diff --git a/embassy-net/build.rs b/embassy-net/build.rs
deleted file mode 100644
index 78bd27ec7..000000000
--- a/embassy-net/build.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-use std::env;
-use std::ffi::OsString;
-use std::process::Command;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-
-    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
-
-    let output = Command::new(rustc)
-        .arg("--version")
-        .output()
-        .expect("failed to run `rustc --version`");
-
-    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
-        println!("cargo:rustc-cfg=nightly");
-    }
-}
diff --git a/embassy-sync/build.rs b/embassy-sync/build.rs
index 0a796b881..afd76dad1 100644
--- a/embassy-sync/build.rs
+++ b/embassy-sync/build.rs
@@ -1,21 +1,8 @@
 use std::env;
-use std::ffi::OsString;
-use std::process::Command;
 
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");
 
-    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
-
-    let output = Command::new(rustc)
-        .arg("--version")
-        .output()
-        .expect("failed to run `rustc --version`");
-
-    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
-        println!("cargo:rustc-cfg=nightly");
-    }
-
     let target = env::var("TARGET").unwrap();
 
     if target.starts_with("thumbv6m-") {
diff --git a/embassy-sync/src/lib.rs b/embassy-sync/src/lib.rs
index b0ccfde57..d88c76db5 100644
--- a/embassy-sync/src/lib.rs
+++ b/embassy-sync/src/lib.rs
@@ -1,6 +1,4 @@
 #![cfg_attr(not(any(feature = "std", feature = "wasm")), no_std)]
-#![cfg_attr(nightly, feature(async_fn_in_trait, impl_trait_projections))]
-#![cfg_attr(nightly, allow(stable_features, unknown_lints))]
 #![allow(async_fn_in_trait)]
 #![allow(clippy::new_without_default)]
 #![doc = include_str!("../README.md")]
diff --git a/embassy-time/build.rs b/embassy-time/build.rs
index 78bd27ec7..f328e4d9d 100644
--- a/embassy-time/build.rs
+++ b/embassy-time/build.rs
@@ -1,18 +1 @@
-use std::env;
-use std::ffi::OsString;
-use std::process::Command;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-
-    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
-
-    let output = Command::new(rustc)
-        .arg("--version")
-        .output()
-        .expect("failed to run `rustc --version`");
-
-    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
-        println!("cargo:rustc-cfg=nightly");
-    }
-}
+fn main() {}
diff --git a/embassy-time/src/lib.rs b/embassy-time/src/lib.rs
index a59ee68d2..7e2546f68 100644
--- a/embassy-time/src/lib.rs
+++ b/embassy-time/src/lib.rs
@@ -1,6 +1,4 @@
 #![cfg_attr(not(any(feature = "std", feature = "wasm", test)), no_std)]
-#![cfg_attr(nightly, feature(async_fn_in_trait, impl_trait_projections))]
-#![cfg_attr(nightly, allow(stable_features, unknown_lints))]
 #![allow(async_fn_in_trait)]
 #![doc = include_str!("../README.md")]
 #![allow(clippy::new_without_default)]