diff --git a/os/.cargo/config b/os/.cargo/config.toml
similarity index 100%
rename from os/.cargo/config
rename to os/.cargo/config.toml
diff --git a/os/src/task/task.rs b/os/src/task/task.rs
index 877786c9f..d4a575b85 100644
--- a/os/src/task/task.rs
+++ b/os/src/task/task.rs
@@ -19,6 +19,7 @@ pub struct TaskControlBlock {
 
 pub struct TaskControlBlockInner {
     pub trap_cx_ppn: PhysPageNum,
+    #[allow(unused)]
     pub base_size: usize,
     pub task_cx: TaskContext,
     pub task_status: TaskStatus,
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 8193d6fc9..c65d258c2 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,6 +1,6 @@
 [toolchain]
 profile = "minimal"
 # use the nightly version of the last stable toolchain, see <https://forge.rust-lang.org/>
-channel = "nightly-2024-01-18"
+channel = "nightly-2024-05-01"
 components = ["rust-src", "llvm-tools", "rustfmt", "clippy"]
-targets = ["riscv64gc-unknown-none-elf"]
\ No newline at end of file
+targets = ["riscv64gc-unknown-none-elf"]
diff --git a/user/.cargo/config b/user/.cargo/config.toml
similarity index 100%
rename from user/.cargo/config
rename to user/.cargo/config.toml