diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9ffd2bb..3517084 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -16,7 +16,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21'
 
       - name: Build
         run: go build -v ./...
diff --git a/Dockerfile b/Dockerfile
index cbdf758..bd5bbc7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/golang:1.20-alpine AS backend_builder
+FROM docker.io/golang:1.21-alpine AS backend_builder
 WORKDIR /app
 RUN apk add git
 COPY go.mod go.sum ./
diff --git a/cmd/panorama/main.go b/cmd/panorama/main.go
index a119878..45dc8da 100644
--- a/cmd/panorama/main.go
+++ b/cmd/panorama/main.go
@@ -2,7 +2,8 @@ package main
 
 import (
 	"flag"
-	"log"
+	"log/slog"
+	"os"
 	"path"
 
 	"github.com/lord-server/panorama/internal/config"
@@ -15,71 +16,84 @@ import (
 )
 
 type Args struct {
-	FullRender bool
-	Downscale  bool
-	Serve      bool
 	ConfigPath string
 }
 
 var args Args
 
-func init() {
-	flag.BoolVar(&args.FullRender, "fullrender", false, "Render entire map")
-	flag.BoolVar(&args.Downscale, "downscale", false, "Downscale existing tiles (--fullrender does this automatically)")
-	flag.BoolVar(&args.Serve, "serve", false, "Serve tiles over the web")
-	flag.StringVar(&args.ConfigPath, "config", "config.toml", "Path to config file")
-	flag.Parse()
-}
-
-func main() {
-	log.Printf("Config path: `%v`", args.ConfigPath)
-	config, err := config.LoadConfig(args.ConfigPath)
-	if err != nil {
-		log.Fatalf("Unable to load config: %v\n", err)
-	}
-
-	quit := make(chan bool)
-
-	if args.Serve {
-		log.Printf("Serving tiles @ %v", config.Web.ListenAddress)
-		go func() {
-			web.Serve(&config)
-			quit <- true
-		}()
-	}
-
-	log.Printf("Game path: `%v`\n", config.System.GamePath)
-
+func fullrender(config config.Config) error {
 	descPath := path.Join(config.System.WorldPath, "nodes_dump.json")
-	log.Printf("Game description: `%v`\n", descPath)
+
+	slog.Info("loading game description", "game", config.System.GamePath, "desc", descPath)
 
 	game, err := game.LoadGame(descPath, config.System.GamePath)
 	if err != nil {
-		log.Fatalf("Unable to load game description: %v\n", err)
+		slog.Error("unable to load game description", "error", err)
+		return err
 	}
 
 	backend, err := world.NewPostgresBackend(config.System.WorldDSN)
 	if err != nil {
-		log.Fatalf("Unable to connect to world DB: %v\n", err)
+		slog.Error("unable to connect to world DB", "error", err)
+		return err
 	}
 
 	world := world.NewWorldWithBackend(backend)
 
 	tiler := tile.NewTiler(config.Region, config.Renderer.ZoomLevels, config.System.TilesPath)
 
-	if args.FullRender {
-		log.Printf("Performing a full render using %v workers", config.Renderer.Workers)
+	slog.Info("performing a full render", "workers", config.Renderer.Workers, "region", config.Region)
+
+	tiler.FullRender(&game, &world, config.Renderer.Workers, config.Region, func() render.Renderer {
+		return isometric.NewRenderer(config.Region, &game)
+	})
+
+	tiler.DownscaleTiles()
+
+	return nil
+}
+
+func run(config config.Config) error {
+	quit := make(chan bool)
 
-		log.Printf("Region: %v", config.Region)
+	slog.Info("starting web server", "address", config.Web.ListenAddress)
+	go func() {
+		web.Serve(&config)
+		quit <- true
+	}()
 
-		tiler.FullRender(&game, &world, config.Renderer.Workers, config.Region, func() render.Renderer {
-			return isometric.NewRenderer(config.Region, &game)
-		})
+	<-quit
+
+	return nil
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		slog.Error("expected a subcommand: (available subcommands: run, fullrender)")
+		os.Exit(1)
 	}
 
-	if args.Downscale || args.FullRender {
-		tiler.DownscaleTiles()
+	subcommand := os.Args[1]
+
+	commonFlags := flag.NewFlagSet("common flags", flag.ExitOnError)
+	commonFlags.StringVar(&args.ConfigPath, "config", "config.toml", "Path to config file")
+	commonFlags.Parse(os.Args[2:])
+
+	slog.Info("loading config", "config_path", args.ConfigPath)
+	config, err := config.LoadConfig(args.ConfigPath)
+	if err != nil {
+		slog.Error("unable to load config", "error", err)
 	}
 
-	<-quit
+	switch subcommand {
+	case "run":
+		err = run(config)
+
+	case "fullrender":
+		err = fullrender(config)
+	}
+
+	if err != nil {
+		os.Exit(1)
+	}
 }
diff --git a/go.mod b/go.mod
index 7051a68..b10f710 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/lord-server/panorama
 
-go 1.20
+go 1.21
 
 require (
 	github.com/BurntSushi/toml v1.2.1
diff --git a/go.sum b/go.sum
index 327c7f2..15ba6b2 100644
--- a/go.sum
+++ b/go.sum
@@ -5,6 +5,7 @@ github.com/andybalholm/brotli v1.0.5 h1:8uQZIdzKmjc/iuPu7O2ioW48L81FgatrcpfFmiq/
 github.com/andybalholm/brotli v1.0.5/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/gofiber/fiber/v2 v2.42.0 h1:Fnp7ybWvS+sjNQsFvkhf4G8OhXswvB6Vee8hM/LyS+8=
 github.com/gofiber/fiber/v2 v2.42.0/go.mod h1:3+SGNjqMh5VQH5Vz2Wdi43zTIV16ktlFd3x3R6O1Zlc=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
@@ -48,6 +49,7 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
+github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/tinylib/msgp v1.1.6/go.mod h1:75BAfg2hauQhs3qedfdDZmWAPcFMAvJE5b9rGOMufyw=
 github.com/tinylib/msgp v1.1.8 h1:FCXC1xanKO4I8plpHGH2P7koL/RzZs12l/+r7vakfm0=
 github.com/tinylib/msgp v1.1.8/go.mod h1:qkpG+2ldGg4xRFmx+jfTvZPxfGFhi64BcnL9vkCm/Tw=
@@ -116,3 +118,4 @@ golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8T
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=