diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 500cbc0a52..ecc57fd334 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -112,7 +112,7 @@ jobs:
           - os: ubuntu-latest
             rust: beta
           - os: ubuntu-latest
-            rust: nightly-2025-12-05
+            rust: nightly-2026-01-20
           - os: macos-latest
             rust: stable
           - os: windows-latest
diff --git a/crates/wit-dylib/test-programs/artifacts/build.rs b/crates/wit-dylib/test-programs/artifacts/build.rs
index 903aab80d7..f68837eb57 100644
--- a/crates/wit-dylib/test-programs/artifacts/build.rs
+++ b/crates/wit-dylib/test-programs/artifacts/build.rs
@@ -33,6 +33,12 @@ https://github.com/webassembly/wasi-sdk
             format!("CARGO_TARGET_{upcase}_LINKER"),
             wasi_sdk_path.join("bin/clang"),
         )
+        // FIXME: this is needed since the Rust standard library is depending on
+        // a buggy libc crate which has bindings for symbols that don't exist.
+        // Once libc is updated in rust-lang/rust and that propagates to stable
+        // this can be removed.
+        .env("CARGO_PROFILE_DEV_LTO", "true")
+        .env("CARGO_PROFILE_RELEASE_LTO", "true")
         .env_remove("CARGO_ENCODED_RUSTFLAGS");
     if !debug {
         cargo.arg("--release");