diff --git a/pkgs/tools/misc/plantuml/default.nix b/pkgs/tools/misc/plantuml/default.nix
index 0355c65ac6c1..eb267e6007a4 100644
--- a/pkgs/tools/misc/plantuml/default.nix
+++ b/pkgs/tools/misc/plantuml/default.nix
@@ -1,12 +1,12 @@
 { lib, stdenv, fetchurl, makeWrapper, jre, graphviz }:
 
 stdenv.mkDerivation rec {
-  version = "1.2021.0";
+  version = "1.2021.1";
   pname = "plantuml";
 
   src = fetchurl {
     url = "mirror://sourceforge/project/plantuml/${version}/plantuml.${version}.jar";
-    sha256 = "sha256-QERrsTB8GO+B8DZkl1Ruru9Bw+uL9ojQbJ321sbqIws=";
+    sha256 = "sha256-FOM+hao1lx6EJMccbhLzvVVmCR3F/igHTGN1vhhdmdQ=";
   };
 
   nativeBuildInputs = [ makeWrapper ];