diff --git a/Runtime/Client/DotNetStandardClient.cs b/Runtime/Client/DotNetStandardClient.cs
index 39282d6..6148a05 100644
--- a/Runtime/Client/DotNetStandardClient.cs
+++ b/Runtime/Client/DotNetStandardClient.cs
@@ -4,6 +4,10 @@
 using System.Net.Http;
 using System.Threading.Tasks;
 
+#if !UNITY_2022_1_OR_NEWER
+using BugSplatUnity.Runtime.Util.Extensions;
+#endif
+
 namespace BugSplatUnity.Runtime.Client
 {
     internal interface IDotNetStandardExceptionClient
diff --git a/Runtime/Plugins/BugSplatDotNetStandard.dll.meta b/Runtime/Plugins/BugSplatDotNetStandard.dll.meta
index 76c390e..a001ffc 100644
--- a/Runtime/Plugins/BugSplatDotNetStandard.dll.meta
+++ b/Runtime/Plugins/BugSplatDotNetStandard.dll.meta
@@ -1,2 +1,33 @@
 fileFormatVersion: 2
-guid: 51532154bbdb24d71babff241f230a10
\ No newline at end of file
+guid: 51532154bbdb24d71babff241f230a10
+PluginImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  iconMap: {}
+  executionOrder: {}
+  defineConstraints: []
+  isPreloaded: 0
+  isOverridable: 1
+  isExplicitlyReferenced: 0
+  validateReferences: 1
+  platformData:
+  - first:
+      Any: 
+    second:
+      enabled: 1
+      settings: {}
+  - first:
+      Editor: Editor
+    second:
+      enabled: 0
+      settings:
+        DefaultValueInitialized: true
+  - first:
+      Windows Store Apps: WindowsStoreApps
+    second:
+      enabled: 0
+      settings:
+        CPU: AnyCPU
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Runtime/Reporter/WebGLReporter.cs b/Runtime/Reporter/WebGLReporter.cs
index 5937e9f..331068f 100644
--- a/Runtime/Reporter/WebGLReporter.cs
+++ b/Runtime/Reporter/WebGLReporter.cs
@@ -3,8 +3,12 @@
 using BugSplatUnity.Runtime.Util;
 using System;
 using System.Collections;
-using UnityEngine;
-
+using UnityEngine;
+
+#if !UNITY_2022_1_OR_NEWER
+using BugSplatUnity.Runtime.Util.Extensions;
+#endif
+
 namespace BugSplatUnity.Runtime.Reporter
 {
     internal class WebGLReporter : IExceptionReporter
diff --git a/Runtime/Util/DictionaryExtensions.cs b/Runtime/Util/DictionaryExtensions.cs
new file mode 100644
index 0000000..c46f460
--- /dev/null
+++ b/Runtime/Util/DictionaryExtensions.cs
@@ -0,0 +1,17 @@
+#if !UNITY_2022_1_OR_NEWER
+using System.Collections.Generic;
+
+namespace BugSplatUnity.Runtime.Util.Extensions
+{
+    public static class DictionaryExtensions
+    {
+        public static bool TryAdd<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, TKey key, TValue value)
+        {
+            if (dictionary == null) return false;
+            if (dictionary.ContainsKey(key)) return false;
+            dictionary.Add(key, value);
+            return true;
+        }
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Runtime/Util/DictionaryExtensions.cs.meta b/Runtime/Util/DictionaryExtensions.cs.meta
new file mode 100644
index 0000000..eed21f6
--- /dev/null
+++ b/Runtime/Util/DictionaryExtensions.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 7ad6cf6bb0770004290306427cd3be9b
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Runtime/Util/ReportPostOptionsExtensions.cs b/Runtime/Util/ReportPostOptionsExtensions.cs
index caecbe1..e4a2810 100644
--- a/Runtime/Util/ReportPostOptionsExtensions.cs
+++ b/Runtime/Util/ReportPostOptionsExtensions.cs
@@ -1,6 +1,10 @@
 using BugSplatUnity.Runtime.Settings;
 using System.Collections.Generic;
 
+#if !UNITY_2022_1_OR_NEWER
+using BugSplatUnity.Runtime.Util.Extensions;
+#endif
+
 namespace BugSplatUnity.Runtime.Util
 {
     internal static class ReportPostOptionsExtensions
diff --git a/Tests/Runtime/Client/Fakes/FakeUnityWebClient.cs b/Tests/Runtime/Client/Fakes/FakeUnityWebClient.cs
index 28af6d7..a98498a 100644
--- a/Tests/Runtime/Client/Fakes/FakeUnityWebClient.cs
+++ b/Tests/Runtime/Client/Fakes/FakeUnityWebClient.cs
@@ -64,6 +64,8 @@ class FakeExceptionPostOptions : IReportPostOptions
         public string Key { get; set; }
         public string Notes { get; set; }
         public string User { get; set; }
-        public int CrashTypeId { get; set; }
+        public int CrashTypeId { get; set; }
+
+        public Dictionary<string, string> AdditionalAttributes => new Dictionary<string,string>();
     }
 }