diff --git a/examples/Cargo.toml b/examples/Cargo.toml
index 9861468..5e116c8 100644
--- a/examples/Cargo.toml
+++ b/examples/Cargo.toml
@@ -11,8 +11,7 @@ lvgl-sys = { path = "../lvgl-sys" }
 embedded-graphics = "0.6"
 embedded-graphics-simulator = "0.2.0"
 heapless = "0.5.5"
-cstr_core = { version = "0.2.0" }
-typenum = "1.12.0"
+cstr_core = { version = "0.2.0", features = ["alloc"] }
 
 [[example]]
 name = "demo"
diff --git a/examples/demo.rs b/examples/demo.rs
index 6b2533b..279b657 100644
--- a/examples/demo.rs
+++ b/examples/demo.rs
@@ -63,7 +63,6 @@ fn main() -> Result<(), LvError> {
 
     let mut t: heapless::String<heapless::consts::U8> = heapless::String::from("test");
     t.push('\0').unwrap();
-    CStr::from_bytes_with_nul_unchecked();
     set_text(CStr::from_bytes_with_nul(t.as_bytes()).unwrap()).unwrap();
     set_text(cstr_core::CStr::from_bytes_with_nul("test\0".as_bytes()).unwrap()).unwrap();
     set_text(cstr_core::CString::new("test").unwrap().as_c_str()).unwrap();
diff --git a/lvgl-codegen/src/lib.rs b/lvgl-codegen/src/lib.rs
index 73917f1..b6b8132 100644
--- a/lvgl-codegen/src/lib.rs
+++ b/lvgl-codegen/src/lib.rs
@@ -79,7 +79,7 @@ impl LvFunc {
     }
 
     pub fn is_method(&self) -> bool {
-        if self.args.len() > 0 {
+        if !self.args.is_empty() {
             let first_arg = &self.args[0];
             return first_arg.typ.literal_name.contains("lv_obj_t");
         }
@@ -374,7 +374,7 @@ impl CodeGen {
         &self.widgets
     }
 
-    fn extract_widgets(functions: &Vec<LvFunc>) -> CGResult<Vec<LvWidget>> {
+    fn extract_widgets(functions: &[LvFunc]) -> CGResult<Vec<LvWidget>> {
         let widget_names = Self::get_widget_names(functions);
 
         let widgets = functions.iter().fold(HashMap::new(), |mut ws, f| {
@@ -395,25 +395,25 @@ impl CodeGen {
             ws
         });
 
-        Ok(widgets.values().map(|v| v.clone()).collect())
+        Ok(widgets.values().cloned().collect())
     }
 
-    fn get_widget_names(functions: &Vec<LvFunc>) -> Vec<String> {
+    fn get_widget_names(functions: &[LvFunc]) -> Vec<String> {
         let reg = format!("^{}([^_]+)_create$", LIB_PREFIX);
         let create_func = Regex::new(reg.as_str()).unwrap();
 
         functions
             .iter()
             .filter(|e| create_func.is_match(e.name.as_str()) && e.args.len() == 2)
-            .filter_map(|f| {
-                Some(String::from(
+            .map(|f| {
+                String::from(
                     create_func
                         .captures(f.name.as_str())
                         .unwrap()
                         .get(1)
                         .unwrap()
                         .as_str(),
-                ))
+                )
             })
             .collect::<Vec<_>>()
     }
diff --git a/lvgl/Cargo.toml b/lvgl/Cargo.toml
index bd29e1b..6d2e0a5 100644
--- a/lvgl/Cargo.toml
+++ b/lvgl/Cargo.toml
@@ -18,7 +18,6 @@ embedded-graphics = "0.6.2"
 cstr_core = { version = "0.2.0" }
 bitflags = "1.2.1"
 heapless = "0.5.5"
-typenum = "1.12.0"
 
 [build-dependencies]
 quote = "1.0.7"
diff --git a/lvgl/src/mem.rs b/lvgl/src/mem.rs
index 7f1bae9..984d8c8 100644
--- a/lvgl/src/mem.rs
+++ b/lvgl/src/mem.rs
@@ -5,16 +5,16 @@ use core::ptr;
 use core::ptr::NonNull;
 
 /// Places `T` into LVGL memory.
-pub struct Box<T: Sized>(NonNull<T>);
+pub struct Box<T>(NonNull<T>);
 
-impl<T: Sized> Box<T> {
+impl<T> Box<T> {
     pub fn new(inner: T) -> LvResult<Box<T>> {
         let layout = mem::size_of::<T>();
         let inner = unsafe {
             let ptr = lvgl_sys::lv_mem_alloc(layout as lvgl_sys::size_t) as *mut T;
             match NonNull::new(ptr) {
                 Some(v) => {
-                    // Place value in new mem
+                    // Move `T` to LVGL managed memory
                     ptr::write(ptr, inner);
                     Ok(v)
                 }
@@ -30,7 +30,7 @@ impl<T: Sized> Box<T> {
     }
 }
 
-impl<T: Sized> Drop for Box<T> {
+impl<T> Drop for Box<T> {
     fn drop(&mut self) {
         unsafe {
             lvgl_sys::lv_mem_free(self.0.as_ptr() as *const cty::c_void);
@@ -38,7 +38,7 @@ impl<T: Sized> Drop for Box<T> {
     }
 }
 
-impl<T: Sized> Deref for Box<T> {
+impl<T> Deref for Box<T> {
     type Target = T;
 
     fn deref(&self) -> &T {
@@ -46,13 +46,13 @@ impl<T: Sized> Deref for Box<T> {
     }
 }
 
-impl<T: Sized> DerefMut for Box<T> {
+impl<T> DerefMut for Box<T> {
     fn deref_mut(&mut self) -> &mut T {
         unsafe { self.0.as_mut() }
     }
 }
 
-impl<T: Sized> AsMut<T> for Box<T> {
+impl<T> AsMut<T> for Box<T> {
     fn as_mut(&mut self) -> &mut T {
         unsafe { self.0.as_mut() }
     }