diff --git a/Cargo.toml b/Cargo.toml
index fcb576e..2686bae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,7 +32,7 @@ rand = "0.8"
 wat = "1"
 wasmparser = "0.96"
 wasmprinter = "0.2"
-wasmi = "0.20"
+wasmi = "0.21"
 
 [features]
 default = ["std"]
diff --git a/benches/benches.rs b/benches/benches.rs
index 155bb18..a777028 100644
--- a/benches/benches.rs
+++ b/benches/benches.rs
@@ -28,7 +28,7 @@ where
 {
 	for entry in read_dir(fixture_dir()).unwrap() {
 		let entry = entry.unwrap();
-		let bytes = read(&entry.path()).unwrap();
+		let bytes = read(entry.path()).unwrap();
 		group.throughput(Throughput::Bytes(bytes.len().try_into().unwrap()));
 		group.bench_with_input(entry.file_name().to_str().unwrap(), &bytes, |bench, input| {
 			bench.iter(|| f(deserialize_buffer(input).unwrap()))
diff --git a/src/stack_limiter/max_height.rs b/src/stack_limiter/max_height.rs
index 4be939b..fc0a030 100644
--- a/src/stack_limiter/max_height.rs
+++ b/src/stack_limiter/max_height.rs
@@ -176,7 +176,7 @@ pub fn compute(func_idx: u32, module: &elements::Module) -> Result<u32, &'static
 		match opcode {
 			Nop => {},
 			Block(ty) | Loop(ty) | If(ty) => {
-				let end_arity = if *ty == BlockType::NoResult { 0 } else { 1 };
+				let end_arity = u32::from(*ty != BlockType::NoResult);
 				let branch_arity = if let Loop(_) = *opcode { 0 } else { end_arity };
 				if let If(_) = *opcode {
 					stack.pop_values(1)?;
diff --git a/tests/overhead.rs b/tests/overhead.rs
index c629275..7a57a97 100644
--- a/tests/overhead.rs
+++ b/tests/overhead.rs
@@ -48,9 +48,9 @@ fn size_overheads_all(files: ReadDir) -> Vec<InstrumentedWasmResults> {
 
 			let (original_module_len, orig_module) = {
 				let bytes = match entry.path().extension().unwrap().to_str() {
-					Some("wasm") => read(&entry.path()).unwrap(),
+					Some("wasm") => read(entry.path()).unwrap(),
 					Some("wat") =>
-						wat::parse_bytes(&read(&entry.path()).unwrap()).unwrap().into_owned(),
+						wat::parse_bytes(&read(entry.path()).unwrap()).unwrap().into_owned(),
 					_ => panic!("expected fixture_dir containing .wasm or .wat files only"),
 				};