diff --git a/build.rs b/build.rs
index 970e88bb..afb92e8a 100644
--- a/build.rs
+++ b/build.rs
@@ -251,7 +251,6 @@ fn build_v8(is_asan: bool) {
     download_ninja_gn_binaries();
   }
 
-  download_rust_toolchain();
 
   // `#[cfg(...)]` attributes don't work as expected from build.rs -- they refer to the configuration
   // of the host system which the build.rs script will be running on. In short, `cfg!(target_<os/arch>)`
@@ -461,17 +460,6 @@ fn maybe_clone_repo(dest: &str, repo: &str) {
 }
 
 fn maybe_install_sysroot(arch: &str) {
-  let sysroot_path = format!("build/linux/debian_sid_{arch}-sysroot");
-  if !PathBuf::from(sysroot_path).is_dir() {
-    assert!(
-      Command::new(python())
-        .arg("./build/linux/sysroot_scripts/install-sysroot.py")
-        .arg(format!("--arch={arch}"))
-        .status()
-        .unwrap()
-        .success()
-    );
-  }
 }
 
 fn download_ninja_gn_binaries() {