diff --git a/pkgs/applications/editors/emacs-modes/proofgeneral/HEAD.nix b/pkgs/applications/editors/emacs-modes/proofgeneral/HEAD.nix
index d119117caebf..a6ccd4f631d5 100644
--- a/pkgs/applications/editors/emacs-modes/proofgeneral/HEAD.nix
+++ b/pkgs/applications/editors/emacs-modes/proofgeneral/HEAD.nix
@@ -5,8 +5,8 @@ stdenv.mkDerivation (rec {
 
   src = fetchgit {
     url = "https://github.com/ProofGeneral/PG.git";
-    rev = "16991280fb09743ae7320aef77f6a166afb907d7";
-    sha256 = "1yakjxfz6a09m7lrxff04sj1717gpmhq2bsibd5f9lkp6z0w2i0q";
+    rev = "64ca55b1593fff8cfffab89c51d7e92c1a68dc27";
+    sha256 = "1gz13fagxf0w2zgp7qd0w328qiv97295jwq7ra8vj61pdfi8xklj";
   };
 
   buildInputs = [ emacs texinfo perl which ] ++ stdenv.lib.optional enableDoc texLive;