diff --git a/README.md b/README.md
index c2b7f6d2..f8af2fe1 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ A fully decentralized inference engine developed by [Gradient](https://gradient.
 ## Installation
 
 ### Prerequisites
-- Python>=3.11.0
+- Python>=3.11.0,<3.14.0
 - Ubuntu-24.04 for Blackwell GPUs
 
 Below are installation methods for different operating systems.
diff --git a/pyproject.toml b/pyproject.toml
index a53887e3..6a99e408 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ name = "parallax"
 version = "0.0.1"
 description = "Decentralised pipeline-parallel LLM serving with Sglang + MLX-LM + Lattica"
 readme = "README.md"
-requires-python = ">=3.11"
+requires-python = ">=3.11,<3.14"
 packages = [
   { include = "parallax", from = "src" },
   { include = "scheduling", from = "src" },
diff --git a/src/parallax/cli.py b/src/parallax/cli.py
index 64ce2c67..b039855a 100644
--- a/src/parallax/cli.py
+++ b/src/parallax/cli.py
@@ -22,9 +22,9 @@
 
 def check_python_version():
     """Check if Python version is 3.11 or higher."""
-    if sys.version_info < (3, 11):
+    if sys.version_info < (3, 11) or sys.version_info >= (3, 14):
         print(
-            f"Error: Python 3.11 or higher is required. Current version is {sys.version_info.major}.{sys.version_info.minor}."
+            f"Error: Python 3.11 or higher and less than 3.14 is required. Current version is {sys.version_info.major}.{sys.version_info.minor}."
         )
         sys.exit(1)