diff --git a/pkgs/development/compilers/kotlin/default.nix b/pkgs/development/compilers/kotlin/default.nix
index 7f4c824686fe..934c9a848b92 100644
--- a/pkgs/development/compilers/kotlin/default.nix
+++ b/pkgs/development/compilers/kotlin/default.nix
@@ -1,14 +1,14 @@
 { stdenv, fetchurl, makeWrapper, jre, unzip }:
 
 let
-  version = "1.4.20";
+  version = "1.4.21";
 in stdenv.mkDerivation {
   inherit version;
   pname = "kotlin";
 
   src = fetchurl {
     url = "https://github.com/JetBrains/kotlin/releases/download/v${version}/kotlin-compiler-${version}.zip";
-    sha256 = "07q16yc7xfw5kzziwxyd7m4dc9msgqk9y2znqw3397kqssj97nqi";
+    sha256 = "1ixnwrvgs14f9160d9d69r7w2dfp5cdwiwpk1ky0ps8nly8hjwj6";
   };
 
   propagatedBuildInputs = [ jre ] ;