diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index 6c33fc93..9bc818b2 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16.x]
+        node-version: [18.x]
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4d149d1c..7677018d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,8 +1,3 @@
-before_script:
-  - cp -v $BUILD_CONFIG_FILE_PREVIEW_YAML config/preview.yaml
-  - cp -v $BUILD_CONFIG_FILE_PREPROD_YAML config/preprod.yaml
-  - cp -v $BUILD_CONFIG_FILE_MAINNET_YAML config/mainnet.yaml
-
 stages:
   - prebuild
   - build
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62b511dc..a7b40d33 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,11 +9,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Flake now exports NixOS module
+
+### Changed
 - support defining a postgres password in config or env
 
 ### Fixed
 
-- bump blockfrost-utils to 2.6.2
+- nixpkgs updated to latest `nixos-23.05`
+- NodeJS updated to `18.16.1`
+- blockfrost-utils updated to `2.6.2`
 
 ## [1.6.0] - 2023-06-28
 
diff --git a/default.nix b/default.nix
index 4e28fd87..f1b37a0d 100644
--- a/default.nix
+++ b/default.nix
@@ -11,26 +11,11 @@
 , system ? builtins.currentSystem
 }:
 let
-  nodejs = pkgs.nodejs-18_x;
+  nodejs = pkgs.nodejs_18;
   nodePackages = nodejs.pkgs;
   testing = import (pkgs.path + "/nixos/lib/testing-python.nix") { inherit system; };
   packageJSON = builtins.fromJSON (builtins.readFile ./package.json);
 
-  # Use this if you want to override config/default.yaml
-  /*
-    blockfrost-backend-test-config = pkgs.writeText "default.yaml" ''
-      server:
-        port: 3000
-        debug: true
-      dbSync:
-        host: "cdbsync-testnet.mydomain.com"
-        user: "cexplorer"
-        database: "cdbsync"
-        network: "mainnet"
-        tokenRegistryUrl: "https://tokens.cardano.org"
-    '';
-  */
-
   blockfrost-backend-ryo =
     let
       src = pkgs.lib.cleanSource ./.;
@@ -77,23 +62,23 @@ in
     name = "blockfrost-backend-ryo-test-mainnet";
 
     nodes.machine = {
+      imports = [ ./nixos-module.nix ];
       # We have to increase memsize, otherwise we will get error:
       # "Kernel panic - not syncing: Out of memory: compulsory panic_on_oom"
       virtualisation.memorySize = 4096;
-      # Backend service
-      systemd.services.blockfrost-backend-ryo = {
-        wantedBy = [ "multi-user.target" ];
-        script = "${blockfrost-backend-ryo}/bin/blockfrost-backend-ryo";
-        environment = {
-          # Use config file from repository
-          NODE_CONFIG_RUNTIME_JSON = "${blockfrost-backend-ryo}/libexec/source/config/mainnet.yaml";
-          /*
-            # Use this if you want to override config/default.yaml
-            NODE_CONFIG_RUNTIME_JSON = "${blockfrost-backend-test-config}";
-          */
+
+      services.blockfrost = {
+        enable = true;
+        package = blockfrost-backend-ryo;
+        settings = {
+          dbSync = {
+            host = builtins.getEnv "DBSYNC_HOST_MAINNET";
+            user = "csyncdb";
+            database = "csyncdb";
+          };
+          tokenRegistryUrl = builtins.getEnv "TOKEN_REGISTRY_URL_MAINNET";
         };
       };
-
     };
 
     testScript = ''
@@ -112,23 +97,24 @@ in
     name = "blockfrost-backend-ryo-test-preview";
 
     nodes.machine = {
+      imports = [ ./nixos-module.nix ];
       # We have to increase memsize, otherwise we will get error:
       # "Kernel panic - not syncing: Out of memory: compulsory panic_on_oom"
       virtualisation.memorySize = 4096;
-      # Backend service
-      systemd.services.blockfrost-backend-ryo = {
-        wantedBy = [ "multi-user.target" ];
-        script = "${blockfrost-backend-ryo}/bin/blockfrost-backend-ryo";
-        environment = {
-          # Use config file from repository
-          NODE_CONFIG_RUNTIME_JSON = "${blockfrost-backend-ryo}/libexec/source/config/preview.yaml";
-          /*
-            # Use this if you want to override config/default.yaml
-            NODE_CONFIG_RUNTIME_JSON = "${blockfrost-backend-test-config}";
-          */
+
+      services.blockfrost = {
+        enable = true;
+        package = blockfrost-backend-ryo;
+        settings = {
+          dbSync = {
+            host = builtins.getEnv "DBSYNC_HOST_PREVIEW";
+            user = "csyncdb";
+            database = "csyncdb";
+          };
+          network = "preview";
+          tokenRegistryUrl = builtins.getEnv "TOKEN_REGISTRY_URL_TESTNETS";
         };
       };
-
     };
 
     testScript = ''
@@ -147,23 +133,24 @@ in
     name = "blockfrost-backend-ryo-test-preprod";
 
     nodes.machine = {
+      imports = [ ./nixos-module.nix ];
       # We have to increase memsize, otherwise we will get error:
       # "Kernel panic - not syncing: Out of memory: compulsory panic_on_oom"
       virtualisation.memorySize = 4096;
-      # Backend service
-      systemd.services.blockfrost-backend-ryo = {
-        wantedBy = [ "multi-user.target" ];
-        script = "${blockfrost-backend-ryo}/bin/blockfrost-backend-ryo";
-        environment = {
-          # Use config file from repository
-          NODE_CONFIG_RUNTIME_JSON = "${blockfrost-backend-ryo}/libexec/source/config/preprod.yaml";
-          /*
-            # Use this if you want to override config/default.yaml
-            NODE_CONFIG_RUNTIME_JSON = "${blockfrost-backend-test-config}";
-          */
+
+      services.blockfrost = {
+        enable = true;
+        package = blockfrost-backend-ryo;
+        settings = {
+          dbSync = {
+            host = builtins.getEnv "DBSYNC_HOST_PREPROD";
+            user = "csyncdb";
+            database = "csyncdb";
+          };
+          network = "preprod";
+          tokenRegistryUrl = builtins.getEnv "TOKEN_REGISTRY_URL_TESTNETS";
         };
       };
-
     };
 
     testScript = ''
diff --git a/flake.nix b/flake.nix
index 3fc59d63..92e7ce26 100644
--- a/flake.nix
+++ b/flake.nix
@@ -60,7 +60,7 @@
       };
       nixosModules.default = {pkgs, ...}: {
         imports = [ ./nixos-module.nix ];
-        services.blockfrost.package = self.packages.${pkgs.system}.blockfrost-backend-ryo;
+        nixpkgs.overlays = [ self.overlays.default ];
       };
     };
 }
diff --git a/nixos-module.nix b/nixos-module.nix
index cca3d62d..07430514 100644
--- a/nixos-module.nix
+++ b/nixos-module.nix
@@ -7,6 +7,7 @@ in {
       enable = lib.mkEnableOption "Blockfrost";
       package = lib.mkOption {
         type = lib.types.package;
+        default = pkgs.blockfrost-backend-ryo;
       };
       stateDir = lib.mkOption {
         type = lib.types.path;
@@ -51,7 +52,7 @@ in {
               };
               port = lib.mkOption {
                 type = lib.types.port;
-                default = 3000;
+                default = 5432;
               };
               user = lib.mkOption {
                 type = lib.types.str;
@@ -110,13 +111,16 @@ in {
     users.groups.blockfrost = lib.mkIf (cfg.group == "blockfrost") { };
 
     systemd.tmpfiles.rules = [
-      "d /etc/pm2 770 ${cfg.user} ${cfg.group}"
+      "d /var/lib/blockfrost-backend-ryo 770 ${cfg.user} ${cfg.group}"
     ];
 
-    systemd.services.blockfrost = {
+    systemd.services.blockfrost-backend-ryo = {
       inherit (cfg) requires;
       wantedBy = [ "multi-user.target" ];
-      environment.NODE_CONFIG_RUNTIME_JSON = settingsFormat.generate "blockfrost-settings.json" cfg.settings;
+      environment = {
+        NODE_CONFIG_RUNTIME_JSON = settingsFormat.generate "blockfrost-settings.json" cfg.settings;
+        HOME = "/var/lib/blockfrost-backend-ryo";
+      };
       serviceConfig = {
         ExecStart = "${cfg.package}/bin/blockfrost-backend-ryo";
         Group = cfg.group;
diff --git a/shell.nix b/shell.nix
index cdfae985..14d73db1 100644
--- a/shell.nix
+++ b/shell.nix
@@ -10,7 +10,7 @@
     { }
 }:
 let
-  nodejs = pkgs.nodejs-16_x;
+  nodejs = pkgs.nodejs_18;
 in
 pkgs.stdenv.mkDerivation {
   name = "blockfrost-backend";