diff --git a/pkgs/development/interpreters/erlang/R21.nix b/pkgs/development/interpreters/erlang/R21.nix
index fdd034fc6075..2fe58a76b031 100644
--- a/pkgs/development/interpreters/erlang/R21.nix
+++ b/pkgs/development/interpreters/erlang/R21.nix
@@ -1,8 +1,8 @@
 { mkDerivation }:
 
 mkDerivation {
-  version = "21.3.8.3";
-  sha256 = "1szybirrcpqsl2nmlmpbkxjqnm6i7l7bma87m5cpwi0kpvlxwmcw";
+  version = "21.3.8.21";
+  sha256 = "sha256-zQCs2hOA66jxAaxl/B42EKCejAktIav2rpVQCNyKCh4=";
 
   prePatch = ''
     substituteInPlace configure.in --replace '`sw_vers -productVersion`' "''${MACOSX_DEPLOYMENT_TARGET:-10.12}"