diff --git a/Cargo.lock b/Cargo.lock
index 3f91ce4..3df4153 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -50,9 +50,9 @@ dependencies = [
 
 [[package]]
 name = "fltk"
-version = "1.4.20"
+version = "1.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3acf0b0170990ce5543e07282ce4231182cd56f19dfd4fe8e1f3c546017e60f"
+checksum = "ec10f6f85572396e927c007f53ef00b05dc0671774356fb2f267bbf7a62a4795"
 dependencies = [
  "bitflags",
  "crossbeam-channel",
@@ -63,9 +63,9 @@ dependencies = [
 
 [[package]]
 name = "fltk-sys"
-version = "1.4.20"
+version = "1.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1fd92cd637a25f810e9feb54d12c1b58bfea010d1e1222fbbca6691d1995208c"
+checksum = "5728b9e06ea6aa5aa3d22c0d719c08330b0716203601bea6f9d8552a9d153e38"
 dependencies = [
  "cmake",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 5ab4f66..6c23c31 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,4 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-fltk = { version = "^1.4.20", features = ["fltk-bundled", "use-wayland"]}
+fltk = { version = "^1.4.21", features = ["fltk-bundled", "use-wayland"]}