diff --git a/src/content/ContentPack.cpp b/src/content/ContentPack.cpp
index 5ad8d9ba..4370c7f8 100644
--- a/src/content/ContentPack.cpp
+++ b/src/content/ContentPack.cpp
@@ -75,7 +75,9 @@ ContentPack ContentPack::read(fs::path folder) {
     auto dependencies = root->list("dependencies");
     if (dependencies) {
         for (size_t i = 0; i < dependencies->size(); i++) {
-            pack.dependencies.push_back(dependencies->str(i));
+            pack.dependencies.push_back(
+                {DependencyLevel::required, dependencies->str(i)}
+            );
         }
     }
 
diff --git a/src/content/ContentPack.h b/src/content/ContentPack.h
index c6ce7c86..e5a61f2d 100644
--- a/src/content/ContentPack.h
+++ b/src/content/ContentPack.h
@@ -26,6 +26,19 @@ public:
     fs::path getFolder() const;
 };
 
+enum class DependencyLevel {
+    required, // dependency must be installed
+    optional, // dependency will be installed if found
+    weak, // dependency will not be installed automatically
+};
+
+
+/// @brief Content-pack that should be installed before the dependent
+struct DependencyPack {
+    DependencyLevel level;
+    std::string id;
+};
+
 struct ContentPack {
     std::string id = "none";
     std::string title = "untitled";
@@ -33,7 +46,7 @@ struct ContentPack {
     std::string creator = "";
     std::string description = "no description";
     fs::path folder;
-    std::vector<std::string> dependencies;
+    std::vector<DependencyPack> dependencies;
 
     fs::path getContentFile() const;
 
diff --git a/src/engine.cpp b/src/engine.cpp
index 42c7deeb..36a005c9 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -205,11 +205,11 @@ Engine::~Engine() {
 
 inline const std::string checkPacks(
     const std::unordered_set<std::string>& packs, 
-    const std::vector<std::string>& dependencies
+    const std::vector<DependencyPack>& dependencies
 ) {
-    for (const std::string& str : dependencies) { 
-        if (packs.find(str) == packs.end()) {
-            return str;
+    for (const auto& dependency : dependencies) { 
+        if (packs.find(dependency.id) == packs.end()) {
+            return dependency.id;
         }
     }
     return "";
@@ -232,6 +232,7 @@ void Engine::loadContent() {
          existingPacks.insert(item.id);
     }
 
+    // FIXME: dependency levels
     while (existingPacks.size() > loadedPacks.size()) {
         for (auto& pack : srcPacks) {
             if(loadedPacks.find(pack.id) != loadedPacks.end()) {
@@ -252,14 +253,14 @@ void Engine::loadContent() {
     }
     
     content.reset(contentBuilder.build());
-    resPaths.reset(new ResPaths(resdir, resRoots));
-
-    Shader::preprocessor->setPaths(resPaths.get());
+    resPaths = std::make_unique<ResPaths>(resdir, resRoots);
 
     langs::setup(resdir, langs::current->getId(), contentPacks);
 
-    std::unique_ptr<Assets> new_assets(new Assets());
     std::cout << "-- loading assets" << std::endl;
+
+    auto new_assets = std::make_unique<Assets>();
+    Shader::preprocessor->setPaths(resPaths.get());
     AssetsLoader loader(new_assets.get(), resPaths.get());
     AssetsLoader::addDefaults(loader, content.get());
     while (loader.hasNext()) {
@@ -268,7 +269,7 @@ void Engine::loadContent() {
             throw std::runtime_error("could not to load assets");
         }
     }
-    assets->extend(*new_assets.get());
+    assets->extend(*new_assets);
     onAssetsLoaded();
 }
 
diff --git a/src/frontend/menu/menu_pause.cpp b/src/frontend/menu/menu_pause.cpp
index 5566a903..7d42c15b 100644
--- a/src/frontend/menu/menu_pause.cpp
+++ b/src/frontend/menu/menu_pause.cpp
@@ -115,21 +115,21 @@ static void reopen_world(Engine* engine, World* world) {
     menus::open_world(wname, engine, true);
 }
 
-// FIXME
+// FIXME: dependency levels
 static bool try_add_dependency(Engine* engine, World* world, const ContentPack& pack, std::string& missing) {
     auto paths = engine->getPaths();
     for (const auto& dependency : pack.dependencies) {
         fs::path folder = ContentPack::findPack(
             paths, 
             world->wfile->directory, 
-            dependency
+            dependency.id
         );
         if (!fs::is_directory(folder)) {
-            missing = dependency;
+            missing = dependency.id;
             return true;
         }
-        if (!world->hasPack(dependency)) {
-            world->wfile->addPack(world, dependency);
+        if (!world->hasPack(dependency.id)) {
+            world->wfile->addPack(world, dependency.id);
         }
     }
     world->wfile->addPack(world, pack.id);