diff --git a/Runtime/Scripts/Mapper.cs b/Runtime/Scripts/Mapper.cs
index 844324e..a76ade4 100644
--- a/Runtime/Scripts/Mapper.cs
+++ b/Runtime/Scripts/Mapper.cs
@@ -9,7 +9,7 @@ internal class Mapper
     {
         internal static Dictionary<string, Permission> PermissionsFromPurchaseJson(string jsonStr)
         {
-            if (Json.Deserialize(jsonStr) is not Dictionary<string, object> result)
+            if (!(Json.Deserialize(jsonStr) is Dictionary<string, object> result))
             {
                 Debug.LogError("Could not parse purchase result");
                 return null;
@@ -17,7 +17,7 @@ internal static Dictionary<string, Permission> PermissionsFromPurchaseJson(strin
             
             var resultPermissions = new Dictionary<string, Permission>();
 
-            if (result["permissions"] is not List<object> permissions)
+            if (!(result["permissions"] is List<object> permissions))
             {
                 Debug.LogError("Could not parse QPermissions");
                 return resultPermissions;
@@ -34,15 +34,13 @@ internal static Dictionary<string, Permission> PermissionsFromPurchaseJson(strin
 
         internal static bool GetIsCancelledFromJson(string jsonStr)
         {
-            if (Json.Deserialize(jsonStr) is not Dictionary<string, object> result)
+            if (!(Json.Deserialize(jsonStr) is Dictionary<string, object> result))
             {
                 Debug.LogError("Could not parse purchase result");
                 return false;
             }
             
-            var isCancelled = Convert.ToBoolean(result.GetValueOrDefault("isCancelled", 0));
-
-            return isCancelled;
+            return result.TryGetValue("isCancelled", out var isCancelled) && Convert.ToBoolean(isCancelled);
         }
 
         internal static Dictionary<string, Permission> PermissionsFromJson(string jsonStr)
diff --git a/Runtime/Scripts/Qonversion.cs b/Runtime/Scripts/Qonversion.cs
index 8895071..5ff0742 100644
--- a/Runtime/Scripts/Qonversion.cs
+++ b/Runtime/Scripts/Qonversion.cs
@@ -52,7 +52,7 @@ public class Qonversion : MonoBehaviour
         private const string OnOfferingsMethodName = "OnOfferings";
         private const string OnEligibilitiesMethodName = "OnEligibilities";
 
-        private const string SdkVersion = "3.5.0";
+        private const string SdkVersion = "3.5.1";
         private const string SdkSource = "unity";
 
         private static IQonversionWrapper _Instance;
@@ -62,14 +62,14 @@ public class Qonversion : MonoBehaviour
         private static string _storedPromoProductId = null;
         private static AutomationsDelegate _automationsDelegate;
 
-        private static List<OnPermissionsReceived> CheckPermissionsCallbacks { get; } = new();
-        private static List<OnPermissionsReceived> RestoreCallbacks { get; } = new();
+        private static List<OnPermissionsReceived> CheckPermissionsCallbacks { get; } = new List<OnPermissionsReceived>();
+        private static List<OnPermissionsReceived> RestoreCallbacks { get; } = new List<OnPermissionsReceived>();
         private static OnPurchaseResultReceived PurchaseCallback { get; set; }
         private static OnPurchaseResultReceived PurchaseProductCallback { get; set; }
         private static OnPurchaseResultReceived UpdatePurchaseCallback { get; set; }
         private static OnPurchaseResultReceived UpdatePurchaseWithProductCallback { get; set; }
-        private static List<OnProductsReceived> ProductsCallbacks { get; } = new();
-        private static List<OnOfferingsReceived> OfferingsCallbacks { get; } = new();
+        private static List<OnProductsReceived> ProductsCallbacks { get; } = new List<OnProductsReceived>();
+        private static List<OnOfferingsReceived> OfferingsCallbacks { get; } = new List<OnOfferingsReceived>();
         private static OnEligibilitiesReceived EligibilitiesCallback { get; set; }
         private static OnPermissionsReceived PromoPurchaseCallback { get; set; }
 
diff --git a/package.json b/package.json
index 8cdfde1..2ce1592 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "com.qonversion.unity",
 	"displayName": "Qonversion",
-	"version": "3.5.0",
+	"version": "3.5.1",
 	"unity": "2018.3",
 	"description": "Empower your mobile app marketing and product decisions with precise subscription data.",
 	"author": {