diff --git a/Makefile b/Makefile
index 324fe03..49a4cea 100644
--- a/Makefile
+++ b/Makefile
@@ -10,20 +10,15 @@ RUSTFLAGS+=-Cforce-frame-pointers=yes
 RUSTFLAGS+=-Ctarget-feature=-crt-static
 CC:=clang
 
-RUST_VERSION?=+1.76.0
-
 CARGO?=cargo
 
-.PHONY: build clean toolchain
+.PHONY: build clean
 
 build:
-	RUSTFLAGS="$(RUSTFLAGS)" $(CARGO) $(RUST_VERSION) build --target x86_64-unknown-linux-gnu --release --lib
+	RUSTFLAGS="$(RUSTFLAGS)" $(CARGO) build --target x86_64-unknown-linux-gnu --release --lib
 
 test/self_test: test/self_test.c
 	$(CC) -o $@ $< -Werror=all -pedantic -ldl -fsanitize=address,fuzzer-no-link -fsanitize-coverage=inline-8bit-counters
 
 clean:
 	$(CARGO) clean
-
-toolchain:
-	rustup toolchain install $(RUST_VERSION)
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..624eb0e
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.76.0"