diff --git a/pkgs/by-name/ex/exim/package.nix b/pkgs/by-name/ex/exim/package.nix
index 2ee910bcb939..b7774c1925a9 100644
--- a/pkgs/by-name/ex/exim/package.nix
+++ b/pkgs/by-name/ex/exim/package.nix
@@ -39,11 +39,11 @@ let
 in
 stdenv.mkDerivation rec {
   pname = "exim";
-  version = "4.99";
+  version = "4.99.1";
 
   src = fetchurl {
     url = "https://ftp.exim.org/pub/exim/exim4/${pname}-${version}.tar.xz";
-    hash = "sha256-XfOLBC/6mpyNMbILyEgVWAcONhsG9ldghiKmKjJ63Lo=";
+    hash = "sha256-6ulnvUml+HmTO4xuyIwwR1ocZkYjITXzfwW1XbxONEc=";
   };
 
   enableParallelBuilding = true;