diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 2cf0ecf8b..4f4b1c20a 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "nightly-2025-12-08"
+channel = "nightly-2026-08-07"
 targets = ["wasm32-unknown-unknown", "wasm32-wasip1"]
 profile = "default" # include rustfmt, clippy
diff --git a/test-no-std/src/main.rs b/test-no-std/src/main.rs
index 180a4c6bf..798d729ef 100644
--- a/test-no-std/src/main.rs
+++ b/test-no-std/src/main.rs
@@ -101,7 +101,7 @@ unsafe impl GlobalAlloc for SimpleAllocator {
 		let mut allocated = 0;
 		if self
 			.remaining
-			.fetch_update(SeqCst, SeqCst, |mut remaining| {
+			.try_update(SeqCst, SeqCst, |mut remaining| {
 				if size > remaining {
 					return None;
 				}