diff --git a/nix/sources.json b/nix/sources.json
index dbedfadd..de390bce 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -25,8 +25,8 @@
     },
     "kassandra": {
         "branch": "master",
-        "repo": "https://git.darmstadt.ccc.de/maralorn/kassandra",
-        "rev": "1a0d19ce5d384e15ca64f7f043e5817cbaaf9f6d",
+        "repo": "git@hera.m-0.eu:kassandra",
+        "rev": "b4d34dd306434efc4bfd098388e41ee8b22e3cba",
         "type": "git"
     },
     "kassandra2": {
diff --git a/overlays/kassandra/default.nix b/overlays/kassandra/default.nix
index 2bb04c1b..61d2ace9 100644
--- a/overlays/kassandra/default.nix
+++ b/overlays/kassandra/default.nix
@@ -7,6 +7,7 @@ self: super: {
         src = super.sources.kassandra;
         nativeBuildInputs = [ pkgconfig ];
         buildInputs = [ openssl ];
-        cargoSha256 = "0aqyaz4kzp93l8mzqjgcnamh0xyhv4g3rv3dfvlkd2w55bz9fmj5";
+        cargoSha256 = "0nlc09sh679vfq7n08836mnjsax2pnskm64jk3c6k0l2spina3nd";
+        doCheck = false;
       }) { };
 }