diff --git a/pkgs/servers/mail/opensmtpd/default.nix b/pkgs/servers/mail/opensmtpd/default.nix
index cd48ab12e24..2e1b3a4f798 100644
--- a/pkgs/servers/mail/opensmtpd/default.nix
+++ b/pkgs/servers/mail/opensmtpd/default.nix
@@ -4,14 +4,14 @@
 
 stdenv.mkDerivation rec {
   name = "opensmtpd-${version}";
-  version = "6.4.1p2";
+  version = "6.4.2p1";
 
   nativeBuildInputs = [ autoconf automake libtool bison ];
   buildInputs = [ libasr libevent zlib libressl db pam ];
 
   src = fetchurl {
     url = "https://www.opensmtpd.org/archives/${name}.tar.gz";
-    sha256 = "0cppqlx4fk6l8rbim5symh2fm1kzshf421256g596j6c9f9q96xn";
+    sha256 = "0pgv080ai7d98l9340jadp9wjiaqj2qvgpqhilcz0kps2mdiawbd";
   };
 
   patches = [