diff --git a/Editor/Core/UnityEditorShell.cs b/Editor/Core/UnityEditorShell.cs
index 97d8580..45d7385 100644
--- a/Editor/Core/UnityEditorShell.cs
+++ b/Editor/Core/UnityEditorShell.cs
@@ -195,7 +195,7 @@ public class Options
         {
             public Encoding Encoding = Encoding.UTF8;
             public string WorkingDirectory = "./";
-            public readonly Dictionary<string, string> EnvironmentVariables = new();
+            public readonly Dictionary<string, string> EnvironmentVariables = new Dictionary<string, string>();
         }
     }
 }