diff --git a/flake.nix b/flake.nix
index 73bdc25..92b67e0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -38,7 +38,7 @@
       # inputs.nixpkgs.follows = "nixpkgs";
     };
 
-    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-23.11";
+    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-24.05";
     simple-nixos-mailserver.inputs.nixpkgs.follows = "nixpkgs";
   };
 
diff --git a/systems/x86_64-linux/sgx-nixos/default.nix b/systems/x86_64-linux/sgx-nixos/default.nix
index 9fb13cb..860abd6 100644
--- a/systems/x86_64-linux/sgx-nixos/default.nix
+++ b/systems/x86_64-linux/sgx-nixos/default.nix
@@ -43,7 +43,6 @@ with lib.metacfg;
     enable = true;
     operation = "switch";
     allowReboot = true;
-    flake = "git+https://git.hoyer.xyz/harald/nixcfg.git?ref=refs/heads/b24.05";
   };
 
   security.tpm2.enable = false;
diff --git a/systems/x86_64-linux/sgx/default.nix b/systems/x86_64-linux/sgx/default.nix
index bfe83fe..f663b61 100644
--- a/systems/x86_64-linux/sgx/default.nix
+++ b/systems/x86_64-linux/sgx/default.nix
@@ -32,7 +32,6 @@
     enable = true;
     operation = "switch";
     allowReboot = true;
-    flake = "git+https://git.hoyer.xyz/harald/nixcfg.git?ref=refs/heads/b24.05";
   };
 
   systemd.targets.sleep.enable = false;
diff --git a/systems/x86_64-linux/t15/default.nix b/systems/x86_64-linux/t15/default.nix
index 43ba021..78c0b3b 100644
--- a/systems/x86_64-linux/t15/default.nix
+++ b/systems/x86_64-linux/t15/default.nix
@@ -15,7 +15,6 @@
     enable = true;
     operation = "boot";
     allowReboot = false;
-    flake = "git+https://git.hoyer.xyz/harald/nixcfg.git?ref=refs/heads/b24.05";
   };
 
   system.stateVersion = "23.11";
diff --git a/systems/x86_64-linux/x1/default.nix b/systems/x86_64-linux/x1/default.nix
index 704af57..5e4e01d 100644
--- a/systems/x86_64-linux/x1/default.nix
+++ b/systems/x86_64-linux/x1/default.nix
@@ -24,7 +24,6 @@ with lib.metacfg;
     enable = true;
     operation = "boot";
     allowReboot = false;
-    flake = "git+https://git.hoyer.xyz/harald/nixcfg.git?ref=refs/heads/b24.05";
   };
 
   system.stateVersion = "23.11";