diff --git a/pkgs/development/interpreters/erlang/R20.nix b/pkgs/development/interpreters/erlang/R20.nix
index cf94a8800f9..866a38e2575 100644
--- a/pkgs/development/interpreters/erlang/R20.nix
+++ b/pkgs/development/interpreters/erlang/R20.nix
@@ -1,8 +1,8 @@
 { mkDerivation, fetchurl }:
 
 mkDerivation rec {
-  version = "20.1";
-  sha256 = "13f53lzgq2himg9kax41f66rzv5pjfrb1ln8b54yv9spkqx2hqqi";
+  version = "20.1.7";
+  sha256 = "0sbxl10d76bm7awxb9s07l9815jiwfg78bps07xj2ircxdr08pls";
 
   prePatch = ''
     substituteInPlace configure.in --replace '`sw_vers -productVersion`' '10.10'