diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8fdb628..2f155a6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -28,11 +28,6 @@ shared: &shared
 
 
 jobs:
-  py310:
-    <<: *shared
-    docker:
-      - image: cimg/python:3.10
-
   py311:
     <<: *shared
     docker:
@@ -57,7 +52,6 @@ workflows:
   version: 2
   build:
     jobs:
-      - py310
       - py311
       - py312
       - py313
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 8ae9dca..606e6f0 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -13,7 +13,7 @@ jobs:
     continue-on-error: true
     strategy:
       matrix:
-        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.11', '3.12', '3.13', '3.14']
 
     steps:
       - uses: actions/checkout@v5
diff --git a/pyproject.toml b/pyproject.toml
index 1bd5e65..2b653b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "finsim"
-version = "1.2.3a1"
+version = "2.0.0a1"
 authors = [
     {name = "Kwan Yuet Stephen Ho", email = "stephenhky@yahoo.com.hk"}
 ]
@@ -12,12 +12,11 @@ description = "Financial simulation and inference"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {text = "LGPL"}
 keywords = ["simulation", "finance", "quantitative finance", "inference", "portfolio analysis"]
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 classifiers = [
     "Topic :: Scientific/Engineering :: Mathematics",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Topic :: Software Development :: Version Control :: Git",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
@@ -37,7 +36,6 @@ dependencies = [
     "yfinance>=0.2.59",
     "openpyxl>=3.1.0",
     "numba",
-    "typing-extensions",
     "pydantic"
 ]
 
diff --git a/src/finsim/portfolio/dynamic.py b/src/finsim/portfolio/dynamic.py
index 94b52b5..62ef60c 100644
--- a/src/finsim/portfolio/dynamic.py
+++ b/src/finsim/portfolio/dynamic.py
@@ -4,15 +4,10 @@
 from collections import defaultdict
 import logging
 import json
-import sys
-from typing import Any, Optional
+from typing import Any, Optional, Self
 from os import PathLike
 from io import TextIOWrapper
 import warnings
-if sys.version_info < (3, 11):
-    from typing_extensions import Self
-else:
-    from typing import Self
 
 import numpy as np
 import pandas as pd
diff --git a/src/finsim/portfolio/portfolio.py b/src/finsim/portfolio/portfolio.py
index 10c8482..52bf6d4 100644
--- a/src/finsim/portfolio/portfolio.py
+++ b/src/finsim/portfolio/portfolio.py
@@ -1,15 +1,10 @@
 
 import json
 import logging
-import sys
 from collections import defaultdict
-from typing import Any, Optional, Literal, Annotated
+from typing import Any, Optional, Literal, Annotated, Self
 from os import PathLike
 from io import TextIOWrapper
-if sys.version_info < (3, 11):
-    from typing_extensions import Self
-else:
-    from typing import Self
 
 import numpy as np
 from numpy.typing import NDArray