diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed1a32e0c174d094c0e1999c89193650e1faab13..97f8056a3723d4c0c2f863ae7b51e211894ba41d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Unreleased
+* Update libm -> `0.2.1`.
+
 ## 0.3
 * Support no-std usage by disabling new default feature `std`.
 ```rust
diff --git a/Cargo.toml b/Cargo.toml
index 03204a29b2b72fe3e63b821ae5e610ab4d114761..6365797849600295aa2bcd7f058918f58b525b6c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ exclude = ["/fonts/**"]
 
 [dependencies]
 byteorder = { version = "1.1", default-features = false }
-libm = { version = "0.1.4", optional = true }
+libm = { version = "0.2.1", optional = true }
 
 [features]
 default = ["std"]
diff --git a/src/lib.rs b/src/lib.rs
index 55df885e8a9d06bccb9be8f26bd44b2ee9c6f5d3..58a529dcc30175b5c4a21698aeddf31ce8586d10 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,12 +11,32 @@ extern crate alloc;
 use alloc::vec::Vec;
 use byteorder::{BigEndian as BE, ByteOrder};
 use core::ops::Deref;
-#[cfg(all(feature = "libm", not(feature = "std")))]
-use libm::F32Ext;
 
 #[cfg(not(any(feature = "libm", feature = "std")))]
 compile_error!("You need to activate either the `std` or `libm` feature.");
 
+#[cfg(all(feature = "libm", not(feature = "std")))]
+trait FloatExt {
+    fn floor(self) -> Self;
+    fn ceil(self) -> Self;
+    fn sqrt(self) -> Self;
+}
+#[cfg(all(feature = "libm", not(feature = "std")))]
+impl FloatExt for f32 {
+    #[inline]
+    fn floor(self) -> Self {
+        libm::floorf(self)
+    }
+    #[inline]
+    fn ceil(self) -> Self {
+        libm::ceilf(self)
+    }
+    #[inline]
+    fn sqrt(self) -> Self {
+        libm::sqrtf(self)
+    }
+}
+
 #[derive(Copy, Clone, Debug)]
 pub struct FontInfo<Data: Deref<Target = [u8]>> {
     data: Data, // pointer to .ttf file