diff --git a/lock.nix b/lock.nix
index 90657f6..b11d9d3 100644
--- a/lock.nix
+++ b/lock.nix
@@ -8,11 +8,11 @@
     sha256 = "sha256-o4FjFOUmjSRMK7dn0TFdAT0RRWUWD+WsspPHa+qEQT8=";
   };
   nixpkgs-unstable = {
-    revision = "063dece00c5a77e4a0ea24e5e5a5bd75232806f8";
-    sha256 = "sha256-nEo1t3Q0F+0jQ36HJfbJtiRU4OI+/0jX/iITURKe3EE=";
+    revision = "c8cd81426f45942bb2906d5ed2fe21d2f19d95b7";
+    sha256 = "sha256-tzCdyIJj9AjysC3OuKA+tMD/kDEDAF9mICPDU7ix0JA=";
   };
   cosmic-modules = {
-    revision = "14411c86d9af8e654e5a1608cc891e4e26f07b2f";
-    sha256 = "sha256-TjRL6QnmOc3tXEJxkH/ThLem8R4g8YsGzAbvoDMW2Q4=";
+    revision = "d20b15f629985fe6900925bef462f947e4a75b2f";
+    sha256 = "sha256-KEuKL7lM2ZqKzvaGIptVDAce29CAR4ZSgWtFD3PnpB0=";
   };
 }
diff --git a/pkgs/by-name/de/den-http-get-updater/package.nix b/pkgs/by-name/de/den-http-get-updater/package.nix
index 484fa35..106451a 100644
--- a/pkgs/by-name/de/den-http-get-updater/package.nix
+++ b/pkgs/by-name/de/den-http-get-updater/package.nix
@@ -113,10 +113,21 @@ writeScript "den-http-get-updater" (''
   nixUnpack = lib.optionalString unpack "--unpack";
   nixName = lib.optionalString (!builtins.isNull name) "--name \"${lib.escapeShellArg name}\"";
 in ''
-  nixUrlsResult=$(nix-instantiate --eval --json --strict \
-    "${prefetchUrlLocationShellEscape.file}" \
-    -A "${prefetchUrlLocationShellEscape.attrpath}"
-  )
+  for i in {{ 1..30 }}; do
+    nixUrlsResult=$(nix-instantiate --eval --json --strict \
+        "${prefetchUrlLocationShellEscape.file}" \
+        -A "${prefetchUrlLocationShellEscape.attrpath}"
+      )
+      if [[ "$?" == "0" ]]; then
+          break
+      elif [[ "$i" == 30 ]]; then
+          echo "error: prefetchUrlLocation failed - attempts exhausted" 1>&2
+          exit 1
+      fi
+      echo "prefetchUrlLocation failed (attempt $i)" 1>&2
+      sleep 2
+  done
+
 
   urlsType=$(jq -rc 'type' <<< "$nixUrlsResult")
   if [ "$urlsType" = "array" ]; then