diff --git a/pytcp/config.py b/pytcp/config.py
index 10288d12..d0d84b0c 100755
--- a/pytcp/config.py
+++ b/pytcp/config.py
@@ -35,10 +35,6 @@
 
 from __future__ import annotations
 
-from sys import version_info
-
-assert version_info >= (3, 12), "PyTCP requires Python version 3.12 or higher."
-
 
 # IPv6 default Hop Limit value.
 IP6__DEFAULT_HOP_LIMIT = 64
diff --git a/pytcp/stack/__init__.py b/pytcp/stack/__init__.py
index ab933aa6..bf7a447f 100755
--- a/pytcp/stack/__init__.py
+++ b/pytcp/stack/__init__.py
@@ -53,12 +53,19 @@
 from .rx_ring import RxRing
 from .timer import Timer
 from .tx_ring import TxRing
+from sys import version_info
 
 if TYPE_CHECKING:
     from net_addr import Ip4Address
     from pytcp.socket.socket import Socket
 
 
+assert version_info >= (
+    3,
+    12,
+), "PyTCP stack requires Python version 3.12 or higher to run."
+
+
 # Interface configuration.
 INTERFACE__TAP__MTU = 1500
 INTERFACE__TUN__MTU = 1500