diff --git a/pkgs/applications/editors/emacs/elisp-packages/updater-emacs.nix b/pkgs/applications/editors/emacs/elisp-packages/updater-emacs.nix
index 0f69da2384d5..f527e64f0885 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/updater-emacs.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/updater-emacs.nix
@@ -3,27 +3,32 @@ let
 
   emacsEnv = pkgs.emacs.pkgs.withPackages (epkgs: let
 
-    promise = epkgs.trivialBuild {
+    promise = epkgs.melpaBuild {
       pname = "promise";
-      version = "1";
+      version = "0-unstable-2019-06-07";
+
       src = pkgs.fetchFromGitHub {
         owner = "bendlas";
         repo = "emacs-promise";
         rev = "4da97087c5babbd8429b5ce62a8323b9b03c6022";
-        sha256 = "0yin7kj69g4zxs30pvk47cnfygxlaw7jc7chr3b36lz51yqczjsy";
+        hash = "sha256-XsvPsA/lUzPWyJAdJg9XtD/vLDtk7guG7p+8ZOQ8Nno=";
       };
+
+      packageRequires = [ epkgs.async ];
     };
 
-    semaphore = epkgs.trivialBuild {
+    semaphore = epkgs.melpaBuild {
       pname = "semaphore";
-      version = "1";
-      packageRequires = [ promise ];
+      version = "0-unstable-2019-06-07";
+
       src = pkgs.fetchFromGitHub {
         owner = "webnf";
         repo = "semaphore.el";
         rev = "93802cb093073bc6a6ccd797328dafffcef248e0";
-        sha256 = "09pfyp27m35sv340xarhld7xx2vv5fs5xj4418709iw6l6hpk853";
+        hash = "sha256-o6B5oaGGxwQOCoTIXrQre4veT6Mwqw7I2LqMesT17iY=";
       };
+
+      packageRequires = [ promise ];
     };
 
   in [ promise semaphore ]);