diff --git a/flake.nix b/flake.nix
index a0a57cbd..2c2ede4f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -179,7 +179,7 @@
     };
   };
 
-  outputs = inputs@{ self, alert2muc, fenix, harmonia, heliwatch, microvm, naersk, nixos, nixos-hardware, nixos-unstable, nixos-unstable-simd, caveman, oparl-scraper, scrapers, secrets, skyflake, sshlogd, sops-nix, spacemsg, ticker, tigger, yammat, zentralwerk, ... }:
+  outputs = inputs@{ self, alert2muc, fenix, harmonia, heliwatch, microvm, naersk, nixos, nixos-hardware, nixos-unstable, caveman, oparl-scraper, scrapers, secrets, skyflake, sshlogd, sops-nix, spacemsg, ticker, tigger, yammat, zentralwerk, ... }:
     let
       inherit (nixos) lib;
 
@@ -240,7 +240,6 @@
       };
     in {
       overlays = import ./overlays {
-        inherit nixos-unstable;
         inherit (inputs) tracer bevy-mandelbrot bevy-julia;
       };
 
diff --git a/hosts/prometheus/default.nix b/hosts/prometheus/default.nix
index 61db242e..feabdf50 100644
--- a/hosts/prometheus/default.nix
+++ b/hosts/prometheus/default.nix
@@ -35,7 +35,7 @@
         };
         "receivers" = [{
           "name" = "xmpp";
-          "webhook_configs" = with config.services.prometheus.xmpp-alerts.settings; [{
+          "webhook_configs" = [{
             "url" = "http://127.0.0.1:9022/";
           }];
         }];
diff --git a/hosts/radiobert/base.nix b/hosts/radiobert/base.nix
deleted file mode 100644
index e69de29b..00000000
diff --git a/overlays/default.nix b/overlays/default.nix
index ebd36aee..268ab659 100644
--- a/overlays/default.nix
+++ b/overlays/default.nix
@@ -1,14 +1,10 @@
-{ nixos-unstable
-, tracer
-, bevy-julia
+{  bevy-julia
 , bevy-mandelbrot
+, tracer
 }:
 
 final: prev:
 
-let
-  pkgs-unstable = nixos-unstable.legacyPackages.${prev.system};
-in
 with final; {
   allcolors = callPackage ./allcolors.nix { };
 
@@ -64,7 +60,7 @@ with final; {
 
   mlat-client = python3Packages.callPackage ./mlat-client.nix { };
 
-  openssh = prev.openssh.overrideAttrs (oldAttrs: {
+  openssh = prev.openssh.overrideAttrs (_: {
     # takes 30 minutes
     doCheck = false;
   });
diff --git a/overlays/telme10.nix b/overlays/telme10.nix
index f692d629..b0a55288 100644
--- a/overlays/telme10.nix
+++ b/overlays/telme10.nix
@@ -1,5 +1,4 @@
-{ stdenv
-, buildGoModule
+{ buildGoModule
 , fetchFromGitHub
 }: