diff --git a/tests/avr/Cargo.toml b/tests/avr/Cargo.toml
index a17839f8..039db66a 100644
--- a/tests/avr/Cargo.toml
+++ b/tests/avr/Cargo.toml
@@ -12,8 +12,6 @@ paste = "1"
 ufmt = "0.2"
 
 [target.avr-unknown-gnu-atmega2560.dependencies]
-# When updating the revision, the reminder to update rust-toolchain.toml to use
-# the same toolchain as https://github.com/Rahix/avr-hal/blob/HEAD/rust-toolchain.toml.
 arduino-hal = { git = "https://github.com/taiki-e/avr-hal.git", branch = "dev", features = ["arduino-mega2560"] }
 
 [workspace]
diff --git a/tests/avr/rust-toolchain.toml b/tests/avr/rust-toolchain.toml
deleted file mode 100644
index 50cd2f04..00000000
--- a/tests/avr/rust-toolchain.toml
+++ /dev/null
@@ -1,6 +0,0 @@
-[toolchain]
-# channel = "nightly-2022-07-10" # LLVM 14
-# channel = "nightly-2023-08-09" # LLVM 17
-channel = "nightly-2024-03-22" # LLVM 18
-components = ["rust-src"]
-profile = "minimal"