diff --git a/pkgs/os-specific/linux/iotop-c/default.nix b/pkgs/os-specific/linux/iotop-c/default.nix
index 680bc53bd91b..4ed45a99ce25 100644
--- a/pkgs/os-specific/linux/iotop-c/default.nix
+++ b/pkgs/os-specific/linux/iotop-c/default.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   pname = "iotop-c";
-  version = "1.20";
+  version = "1.21";
 
   src = fetchFromGitHub {
     owner = "Tomas-M";
     repo = "iotop";
     rev = "v${version}";
-    sha256 = "sha256-6Pg2CLWzsD6EPRKD2xMMgKFkpbSheiMMkd0BvHh9onA=";
+    sha256 = "sha256-Zzm0EV6baQvKPOC762mnieYe1JM7ZfNovKqFQt20jQ8=";
   };
 
   nativeBuildInputs = [ pkg-config ];