diff --git a/default.nix b/default.nix
index fe4085d5a..3a7defc28 100644
--- a/default.nix
+++ b/default.nix
@@ -36,8 +36,11 @@ in {
       exwm = mkExDrv emacsPackagesNg "exwm" {
         packageRequires = [ xelb ];
       };
+      exim = mkExDrv emacsPackagesNg "exim" {
+        packageRequires = [ xelb ];
+      };
     in {
-      inherit exwm xelb;
+      inherit exwm xelb exim;
     });
   in overridenAttrs // {
     emacsWithPackages = emacsWithPackages overridenAttrs;
diff --git a/repos/exim.json b/repos/exim.json
new file mode 100644
index 000000000..16e570570
--- /dev/null
+++ b/repos/exim.json
@@ -0,0 +1 @@
+{"rev": "247f8d823d23050d98a40afe4ed807b37b0995fb", "sha256": "1xi125a8pfppdnx7bckybj30h9qs84b6i8dbq4lxadz9g5fhcy2g", "version": "20160730.0"}
diff --git a/update b/update
index 11e1d1a67..73d9a401c 100755
--- a/update
+++ b/update
@@ -19,5 +19,6 @@ function update_repo() {
 
 update_repo exwm
 update_repo xelb
+update_repo exim
 
 nix-build --no-out-link --show-trace ./test.nix