diff --git a/pkgs/applications/window-managers/i3/gaps.nix b/pkgs/applications/window-managers/i3/gaps.nix
index faa325023f9f..64d863e8047f 100644
--- a/pkgs/applications/window-managers/i3/gaps.nix
+++ b/pkgs/applications/window-managers/i3/gaps.nix
@@ -2,13 +2,13 @@
 
 i3.overrideAttrs (oldAttrs : rec {
   pname = "i3-gaps";
-  version = "4.20.1";
+  version = "4.21";
 
   src = fetchFromGitHub {
     owner = "Airblader";
     repo = "i3";
     rev = version;
-    sha256 = "sha256-aS1dLs8KxoJaTf3RlQX+zRrtNmHEFZgkXDjt+8SuGDw=";
+    sha256 = "sha256-douSRvnyDbi2gDJfu9VZmmTyYfy+FrFWHgyAyPyBWdM=";
   };
 
   meta = with lib; {