diff --git a/pkgs/by-name/au/authelia/sources.nix b/pkgs/by-name/au/authelia/sources.nix
index 18b0c37e5e37..095d522635ad 100644
--- a/pkgs/by-name/au/authelia/sources.nix
+++ b/pkgs/by-name/au/authelia/sources.nix
@@ -1,14 +1,14 @@
 { fetchFromGitHub }:
 rec {
   pname = "authelia";
-  version = "4.39.12";
+  version = "4.39.18";
 
   src = fetchFromGitHub {
     owner = "authelia";
     repo = "authelia";
     rev = "v${version}";
-    hash = "sha256-u7TIhOGXfvWdAXvpL5qa43jaoa7PNAVL2MtGEuWBDPc=";
+    hash = "sha256-IROdncF3TC1X9000jw0RGtrcFrzqRpG7g2QuLGQ/Q4k=";
   };
-  vendorHash = "sha256-7RoPv4OvOhiv+TmYOJuW95h/uh2LuTrpUSAZiTvbh7g=";
-  pnpmDepsHash = "sha256-Ck2nqFwDv3OxN0ONA3A+h4Rli1te+EYqKivcqrAInKw=";
+  vendorHash = "sha256-ZDsLRMip2B8PPZu8VxW+91FVvwC2rXzohhAZFifT26g=";
+  pnpmDepsHash = "sha256-ki/jXNT9dIno1UIcDgBcsLdiKcaiw/dwnff3t9xv07o=";
 }
diff --git a/pkgs/by-name/au/authelia/web.nix b/pkgs/by-name/au/authelia/web.nix
index 9682c05adf78..dd4f8851f0c8 100644
--- a/pkgs/by-name/au/authelia/web.nix
+++ b/pkgs/by-name/au/authelia/web.nix
@@ -40,8 +40,12 @@ stdenv.mkDerivation (finalAttrs: {
   };
 
   postPatch = ''
+    NL=$'\n'
+    LINE_BEFORE_HOST='allowedHosts: ["login.example.com", ...allowedHosts],'
+
     substituteInPlace ./vite.config.ts \
-      --replace 'outDir: "../internal/server/public_html"' 'outDir: "dist"'
+      --replace-fail 'outDir: "../internal/server/public_html"' 'outDir: "dist"' \
+      --replace-fail "$LINE_BEFORE_HOST" "$LINE_BEFORE_HOST$NL"'            host: "127.0.0.1",'
   '';
 
   postBuild = ''