diff --git a/Assets/RothenburgAR/Scripts/Updater/UpdaterBehaviour.cs b/Assets/RothenburgAR/Scripts/Updater/UpdaterBehaviour.cs
index 653d8a0..f0ba328 100644
--- a/Assets/RothenburgAR/Scripts/Updater/UpdaterBehaviour.cs
+++ b/Assets/RothenburgAR/Scripts/Updater/UpdaterBehaviour.cs
@@ -39,12 +39,10 @@ namespace RothenburgAR.Updater
         {
             // check for updates and ask for permission to download if there are any
 
-            //TODO generate versionmap (i guess by crawling all subdirs of /exhibitions)
-            string versionMap = "[]";
+            string versionMap = GenerateVersionMap();
             HttpHandler http = new HttpRequest(ApiInfo.VersionCheckEndpoint, HttpVerb.POST, versionMap).send();
             httpHandlers.Add(http);
 
-            // httpHandler.operation.progress needs to be polled
             http.operation.completed += ar =>
             {
                 if (CheckNetworkErrors(http))
@@ -54,7 +52,7 @@ namespace RothenburgAR.Updater
 
                 Debug.Log(http.download.text);
 
-                //versionAnswer = JsonConvert.DeserializeObject<VersioncheckAnswer>(httpHandler.download.text);
+                //VersionAnswer = JsonConvert.DeserializeObject<VersioncheckAnswer>(http.download.text);
                 VersionAnswer = JsonConvert.DeserializeObject<VersioncheckAnswer>(@"{""languages"":[""de"",""en""],""data"":[{""id"":""006e164c-5e31-4ddf-adf5-df7016c8b3a8"",""meta"":{""status"":""ok"",""updateUrl"":""https://lambdalike.pa.kaim.network/meta/006e164c-5e31-4ddf-adf5-df7016c8b3a7/{lang}""},""tracker"":{""status"":""ok"",""updateUrl"":""https://lambdalike.pa.kaim.network/meta/006e164c-5e31-4ddf-adf5-df7016c8b3a7/{lang}""}},{""id"":""006e164c-5e31-4ddf-adf5-df7016c8b3a7"",""meta"":{""status"":""updated"",""updateUrl"":""https://lambdalike.pa.kaim.network/meta/006e164c-5e31-4ddf-adf5-df7016c8b3a7/{lang}""},""tracker"":{""status"":""ok"",""updateUrl"":""https://lambdalike.pa.kaim.network/meta/006e164c-5e31-4ddf-adf5-df7016c8b3a7/{lang}""}}]}");
 
                 if (VersionAnswer.data.TrueForAll(d => d.Meta.Status == VersionStatus.ok && d.Tracker.Status == VersionStatus.ok))
@@ -75,6 +73,32 @@ namespace RothenburgAR.Updater
             };
         }
 
+        private string GenerateVersionMap()
+        {
+            string result = "{";
+
+            var rootDir = new DirectoryInfo(PathHelper.ExhibitionPath);
+            var exhibitionDirs = rootDir.GetDirectories().ToList();
+            exhibitionDirs.ForEach(dir =>
+            {
+                var subdir = dir.GetDirectories().ToList().First();
+                if (subdir == null) return;
+
+                var metaFilePath = Path.Combine(subdir.FullName, "meta.json");
+                if (!File.Exists(metaFilePath)) return;
+
+                var exhibits = JsonConvert.DeserializeObject<List<Exhibit>>(File.ReadAllText(metaFilePath));
+                foreach (var exhibit in exhibits)
+                {
+                    result += @"""{id}"":""{version}"",".Replace("{id}", exhibit.Id).Replace("{version}", exhibit.UpdatedTime.ToString());
+                }
+            });
+
+            result = result.Substring(0, result.Length - 1);
+            result += "}";
+            return result;
+        }
+
         private void TriggerUpdate()
         {
             // TODO create centralized network error feedback hub thing