diff --git a/pkgs/applications/networking/mailreaders/sylpheed/default.nix b/pkgs/applications/networking/mailreaders/sylpheed/default.nix
index 3f0282a3fcd9..5e17c07880d2 100644
--- a/pkgs/applications/networking/mailreaders/sylpheed/default.nix
+++ b/pkgs/applications/networking/mailreaders/sylpheed/default.nix
@@ -8,12 +8,12 @@ assert sslSupport -> openssl != null;
 assert imageSupport -> gdkpixbuf != null;
 
 stdenv.mkDerivation {
-  name = "sylpheed-0.9.12";
+  name = "sylpheed-1.0.0-pre-beta3";
 
   builder = ./builder.sh;
   src = fetchurl {
-    url = http://sylpheed.good-day.net/sylpheed/sylpheed-0.9.12.tar.bz2;
-    md5 = "5deab7d65f8e19444902be3d82610e6b";
+    url = http://sylpheed.good-day.net/sylpheed/sylpheed-1.0.0beta3.tar.bz2;
+    md5 = "44d98cc4ed490dfdb92016b7689396cf";
   };
 
   inherit sslSupport imageSupport;