diff --git a/prototorch/datasets/abstract.py b/prototorch/datasets/abstract.py
index 92ce33d..8d43cdc 100644
--- a/prototorch/datasets/abstract.py
+++ b/prototorch/datasets/abstract.py
@@ -20,7 +20,7 @@ class Dataset(torch.utils.data.Dataset):
     _repr_indent = 2
 
     def __init__(self, root):
-        if isinstance(root, torch._six.string_classes):
+        if isinstance(root, str):
             root = os.path.expanduser(root)
         self.root = root
 
diff --git a/setup.py b/setup.py
index 4d29c40..362e412 100644
--- a/setup.py
+++ b/setup.py
@@ -15,13 +15,13 @@ from setuptools import find_packages, setup
 PROJECT_URL = "https://github.com/si-cim/prototorch"
 DOWNLOAD_URL = "https://github.com/si-cim/prototorch.git"
 
-with open("README.md") as fh:
+with open("README.md", encoding="utf-8") as fh:
     long_description = fh.read()
 
 INSTALL_REQUIRES = [
-    "torch>=1.3.1",
-    "torchvision>=0.7.5",
-    "numpy>=1.9.1",
+    "torch>=2.0.0",
+    "torchvision",
+    "numpy",
     "scikit-learn",
     "matplotlib",
 ]
@@ -62,7 +62,7 @@ setup(
     url=PROJECT_URL,
     download_url=DOWNLOAD_URL,
     license="MIT",
-    python_requires=">=3.7",
+    python_requires=">=3.8",
     install_requires=INSTALL_REQUIRES,
     extras_require={
         "datasets": DATASETS,
@@ -85,10 +85,10 @@ setup(
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
         "Programming Language :: Python :: 3",
-        "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",
     ],
     packages=find_packages(),
     zip_safe=False,