diff --git a/launcher/minecraft/MojangVersionFormat.cpp b/launcher/minecraft/MojangVersionFormat.cpp
index 9bbb4ada..9b442d63 100644
--- a/launcher/minecraft/MojangVersionFormat.cpp
+++ b/launcher/minecraft/MojangVersionFormat.cpp
@@ -306,6 +306,15 @@ void MojangVersionFormat::writeVersionProperties(const VersionFile* in, QJsonObj
         }
         out.insert("downloads", downloadsOut);
     }
+    if(in->compatibleJavaMajors.size())
+    {
+        QJsonArray compatibleJavaMajorsOut;
+        for(auto compatibleJavaMajor : in->compatibleJavaMajors)
+        {
+            compatibleJavaMajorsOut.append(compatibleJavaMajor);
+        }
+        out.insert("compatibleJavaMajors", compatibleJavaMajorsOut);
+    }
 }
 
 QJsonDocument MojangVersionFormat::versionFileToJson(const VersionFilePtr &patch)
diff --git a/launcher/minecraft/OneSixVersionFormat.cpp b/launcher/minecraft/OneSixVersionFormat.cpp
index c70e5ec5..ac29791b 100644
--- a/launcher/minecraft/OneSixVersionFormat.cpp
+++ b/launcher/minecraft/OneSixVersionFormat.cpp
@@ -331,6 +331,20 @@ QJsonDocument OneSixVersionFormat::versionFileToJson(const VersionFilePtr &patch
     writeString(root, "appletClass", patch->appletClass);
     writeStringList(root, "+tweakers", patch->addTweakers);
     writeStringList(root, "+traits", patch->traits.values());
+    writeStringList(root, "+jvmArgs", patch->addnJvmArguments);
+    if (!patch->agents.isEmpty())
+    {
+        QJsonArray array;
+        for (auto value: patch->agents)
+        {
+            QJsonObject agentOut = OneSixVersionFormat::libraryToJson(value->library().get());
+            if (!value->argument().isEmpty())
+                agentOut.insert("argument", value->argument());
+
+            array.append(agentOut);
+        }
+        root.insert("+agents", array);
+    }
     if (!patch->libraries.isEmpty())
     {
         QJsonArray array;