diff --git a/README.md b/README.md
index a5ad27bd3..02a955beb 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 **dpdata** is a python package for manipulating data formats of software in computational science, including DeePMD-kit, VASP, LAMMPS, GROMACS, Gaussian.
-dpdata only works with python 3.x.
+dpdata only works with python 3.7 or above.
 
 
 # Installation
diff --git a/docs/index.rst b/docs/index.rst
index e4b34f1db..6b0c5344e 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -10,6 +10,7 @@ Welcome to dpdata's documentation!
    :maxdepth: 2
    :caption: Contents:
 
+   Overview <self>
    cli
    formats
    api/api
diff --git a/pyproject.toml b/pyproject.toml
index 87151506c..ee926aaeb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,11 @@ authors = [
 ]
 license = {file = "LICENSE"}
 classifiers = [
-    "Programming Language :: Python :: 3.6",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
     "License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)",
 ]
 dependencies = [