diff --git a/pkgs/tools/networking/offlineimap/default.nix b/pkgs/tools/networking/offlineimap/default.nix
index 5a8f6b8caae..2c2557cdc5c 100644
--- a/pkgs/tools/networking/offlineimap/default.nix
+++ b/pkgs/tools/networking/offlineimap/default.nix
@@ -1,13 +1,13 @@
 { fetchurl, buildPythonPackage }:
 
 buildPythonPackage rec {
-  version = "6.5.3";
+  version = "6.5.5-rc2";
   name = "offlineimap-${version}";
 
   src = fetchurl {
-    url = "https://github.com/spaetz/offlineimap/tarball/v${version}";
+    url = "https://github.com/OfflineIMAP/offlineimap/tarball/v${version}";
     name = "${name}.tar.bz";
-    sha256 = "8717a56e6244b47b908b23b598efb3470d74450ecd881b6d3573d8aec4a5db38";
+    sha256 = "03w3irh8pxwvivi139xm5iaj2f8vmriak1ispq9d9f84z1098pd3";
   };
 
   doCheck = false;