diff --git a/pkgs/tools/audio/abcm2ps/default.nix b/pkgs/tools/audio/abcm2ps/default.nix
index 6d50a849a778..f93231d80222 100644
--- a/pkgs/tools/audio/abcm2ps/default.nix
+++ b/pkgs/tools/audio/abcm2ps/default.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   name = "abcm2ps-${version}";
-  version = "8.13.19";
+  version = "8.13.20";
 
   src = fetchFromGitHub {
     owner = "leesavide";
     repo = "abcm2ps";
     rev = "v${version}";
-    sha256 = "0iv8fzl601rkww9dplajwzlfdb8r7142qdsj8xmvrbwqkaval51f";
+    sha256 = "0zgwrclky6b1l1pd07s31azyxf4clwi3cp5x0wjix0wp78b89pbx";
   };
 
   prePatch = ''