diff --git a/Cargo.toml b/Cargo.toml
index 44ae4b831b..91ba28c7b2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,32 +42,13 @@ atomic-polyfill = { version = "1.0.1", optional = true }
 
 [dependencies]
 hash32 = "0.3.0"
+serde = { version = "1", optional = true, default-features = false }
+stable_deref_trait = { version = "1", default-features = false }
+ufmt-write = { version = "0.1", optional = true }
+defmt = { version = ">=0.2.0,<0.4", optional = true }
 
-[target.'cfg(target_arch = "x86_64")'.dependencies]
-spin = "0.9.4"
-
-[dependencies.serde]
-version = "1"
-optional = true
-default-features = false
-
-[dependencies.stable_deref_trait]
-version = "1"
-default-features = false
-
-[dependencies.ufmt-write]
-version = "0.1"
-optional = true
-
-[dev-dependencies.ufmt]
-version = "0.1"
-
-[dependencies.defmt]
-version = ">=0.2.0,<0.4"
-optional = true
-
-[build-dependencies]
-rustc_version = "0.4.0"
+[dev-dependencies]
+ufmt = { version = "0.1" }
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/build.rs b/build.rs
index 4f16486c26..6ea5ec527b 100644
--- a/build.rs
+++ b/build.rs
@@ -8,8 +8,6 @@ use std::{
     process::{Command, ExitStatus, Stdio},
 };
 
-use rustc_version::Channel;
-
 fn main() -> Result<(), Box<dyn Error>> {
     let target = env::var("TARGET")?;
 
@@ -90,13 +88,6 @@ fn main() -> Result<(), Box<dyn Error>> {
         }
     }
 
-    if !matches!(
-        rustc_version::version_meta().unwrap().channel,
-        Channel::Stable | Channel::Beta
-    ) {
-        println!("cargo:rustc-cfg=unstable_channel");
-    }
-
     match compile_probe(ARM_LLSC_PROBE) {
         Some(status) if status.success() => println!("cargo:rustc-cfg=arm_llsc"),
         _ => {}
diff --git a/tests/tsan.rs b/tests/tsan.rs
index 0ae2a4c41b..74629ead2c 100644
--- a/tests/tsan.rs
+++ b/tests/tsan.rs
@@ -50,7 +50,6 @@ fn twice() {
 }
 
 #[test]
-#[cfg(unstable_channel)]
 fn scoped() {
     let mut rb: spsc::Queue<i32, 5> = spsc::Queue::new();
 
@@ -75,7 +74,6 @@ fn scoped() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // too slow
-#[cfg(unstable_channel)]
 fn contention() {
     const N: usize = 1024;
 
@@ -121,7 +119,6 @@ fn contention() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // too slow
-#[cfg(unstable_channel)]
 fn mpmc_contention() {
     use std::sync::mpsc;
 
@@ -172,7 +169,6 @@ fn mpmc_contention() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // too slow
-#[cfg(unstable_channel)]
 fn unchecked() {
     const N: usize = 1024;