diff --git a/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Serialization.MemoryPack/csc.rsp b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Serialization.MemoryPack/csc.rsp
new file mode 100644
index 000000000..2dabb0c53
--- /dev/null
+++ b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Serialization.MemoryPack/csc.rsp
@@ -0,0 +1 @@
+-nullable
\ No newline at end of file
diff --git a/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Serialization.MessagePack/csc.rsp b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Serialization.MessagePack/csc.rsp
new file mode 100644
index 000000000..2dabb0c53
--- /dev/null
+++ b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Serialization.MessagePack/csc.rsp
@@ -0,0 +1 @@
+-nullable
\ No newline at end of file
diff --git a/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Shared/csc.rsp b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Shared/csc.rsp
new file mode 100644
index 000000000..2dabb0c53
--- /dev/null
+++ b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Shared/csc.rsp
@@ -0,0 +1 @@
+-nullable
\ No newline at end of file