diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 8c89516d..b2659fde 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -31,7 +31,7 @@ jobs:
         test-id: [main]
         include:
           - julia-version: '1.10'
-            python-version: '3.9'
+            python-version: '3.10'
             os: ubuntu-latest
             test-id: include
           - julia-version: '1'
@@ -89,7 +89,7 @@ jobs:
         julia-version: ['1']
         include:
           - os: ubuntu-latest
-            python-version: '3.9'
+            python-version: '3.10'
             julia-version: '1.10'
     steps:
       - uses: actions/checkout@v4
@@ -168,7 +168,7 @@ jobs:
       matrix:
         python-version:
           - '3.12'
-          - '3.9'
+          - '3.10'
         os: ['ubuntu-latest']
 
     steps:
@@ -184,10 +184,10 @@ jobs:
             pip install '.[dev]'
       - name: "Run mypy"
         run: python -m mypy --install-types --non-interactive pysr
-        if: ${{ matrix.python-version != '3.9' }}
+        if: ${{ matrix.python-version != '3.10' }}
       - name: "Run compatible mypy"
         run: python -m mypy --ignore-missing-imports pysr
-        if: ${{ matrix.python-version == '3.9' }}
+        if: ${{ matrix.python-version == '3.10' }}
 
   beartype:
     name: Test with beartype
diff --git a/.github/workflows/CI_conda_forge.yml b/.github/workflows/CI_conda_forge.yml
index 98d064b9..097a22bc 100644
--- a/.github/workflows/CI_conda_forge.yml
+++ b/.github/workflows/CI_conda_forge.yml
@@ -20,17 +20,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12']
         os: ['ubuntu-latest']
         use-mamba: [true, false]
         include:
-          - python-version: 3.9
+          - python-version: 3.10
             os: 'windows-latest'
             use-mamba: true
           - python-version: 3.12
             os: 'windows-latest'
             use-mamba: true
-          - python-version: 3.9
+          - python-version: 3.10
             os: 'macos-latest'
             use-mamba: true
           - python-version: 3.12
diff --git a/.github/workflows/CI_docker_large_nightly.yml b/.github/workflows/CI_docker_large_nightly.yml
index 35d15fba..4e6dbf8b 100644
--- a/.github/workflows/CI_docker_large_nightly.yml
+++ b/.github/workflows/CI_docker_large_nightly.yml
@@ -18,8 +18,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: ['1.6', '1']
-        python-version: ['3.9', '3.12']
+        julia-version: ['1.10', '1']
+        python-version: ['3.10', '3.12']
         os: [ubuntu-latest]
         arch: ['linux/amd64', 'linux/arm64']
 
diff --git a/.github/workflows/CI_large_nightly.yml b/.github/workflows/CI_large_nightly.yml
index 369d4bf4..4598468b 100644
--- a/.github/workflows/CI_large_nightly.yml
+++ b/.github/workflows/CI_large_nightly.yml
@@ -23,8 +23,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: ['1.6', '1.8', '1.10']
-        python-version: ['3.9', '3.10', '3.12']
+        julia-version: ['1.10', '1']
+        python-version: ['3.10', '3.12']
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
diff --git a/environment.yml b/environment.yml
index 840b6a1c..fbed19f6 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,11 +2,10 @@ name: test
 channels:
   - conda-forge
 dependencies:
-  - python>=3.9
+  - python>=3.10
   - sympy>=1.0.0,<2.0.0
   - pandas>=0.21.0,<3.0.0
   - numpy>=1.13.0,<2.0.0
   - scikit-learn>=1.0.0,<2.0.0
   - pyjuliacall>=0.9.21,<0.9.22
   - click>=7.0.0,<9.0.0
-  - typing-extensions>=4.0.0,<5.0.0
diff --git a/pyproject.toml b/pyproject.toml
index c9ed895f..c3ed9622 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ authors = [
 description = "Simple and efficient symbolic regression"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {file = "LICENSE"}
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
     "Programming Language :: Python :: 3",
     "Operating System :: OS Independent",
@@ -25,7 +25,6 @@ dependencies = [
     "juliacall==0.9.23",
     "click>=7.0.0,<9.0.0",
     "setuptools>=50.0.0",
-    "typing-extensions>=4.0.0,<5.0.0",
 ]
 
 [project.optional-dependencies]
diff --git a/pysr/denoising.py b/pysr/denoising.py
index fbf17468..92a640ee 100644
--- a/pysr/denoising.py
+++ b/pysr/denoising.py
@@ -1,7 +1,5 @@
 """Functions for denoising data during preprocessing."""
 
-from __future__ import annotations
-
 from typing import cast
 
 import numpy as np
diff --git a/pysr/export.py b/pysr/export.py
index bc88b7e1..c1b589b8 100644
--- a/pysr/export.py
+++ b/pysr/export.py
@@ -1,12 +1,5 @@
-from __future__ import annotations
-
 import copy
-import sys
-
-if sys.version_info >= (3, 10):
-    from collections.abc import Callable
-else:
-    from typing import Callable
+from collections.abc import Callable
 
 import numpy as np
 import pandas as pd
diff --git a/pysr/export_latex.py b/pysr/export_latex.py
index f00fc48a..55d24de0 100644
--- a/pysr/export_latex.py
+++ b/pysr/export_latex.py
@@ -1,7 +1,5 @@
 """Functions to help export PySR equations to LaTeX."""
 
-from __future__ import annotations
-
 import pandas as pd
 import sympy  # type: ignore
 from sympy.printing.latex import LatexPrinter  # type: ignore
diff --git a/pysr/export_numpy.py b/pysr/export_numpy.py
index c6783498..163726d6 100644
--- a/pysr/export_numpy.py
+++ b/pysr/export_numpy.py
@@ -1,7 +1,5 @@
 """Code for exporting discovered expressions to numpy"""
 
-from __future__ import annotations
-
 import warnings
 
 import numpy as np
diff --git a/pysr/export_sympy.py b/pysr/export_sympy.py
index 9f3112e8..ea54b01c 100644
--- a/pysr/export_sympy.py
+++ b/pysr/export_sympy.py
@@ -1,13 +1,6 @@
 """Define utilities to export to sympy"""
 
-from __future__ import annotations
-
-import sys
-
-if sys.version_info >= (3, 10):
-    from collections.abc import Callable
-else:
-    from typing import Callable
+from collections.abc import Callable
 
 import sympy  # type: ignore
 from sympy import sympify
diff --git a/pysr/expression_specs.py b/pysr/expression_specs.py
index b7103d35..e8606478 100644
--- a/pysr/expression_specs.py
+++ b/pysr/expression_specs.py
@@ -1,14 +1,6 @@
-from __future__ import annotations
-
 import copy
-import sys
 from abc import ABC, abstractmethod
-from typing import TYPE_CHECKING, Any, NewType
-
-if sys.version_info >= (3, 10):
-    from typing import TypeAlias
-else:
-    from typing_extensions import TypeAlias
+from typing import TYPE_CHECKING, Any, NewType, TypeAlias
 
 import numpy as np
 import pandas as pd
diff --git a/pysr/feature_selection.py b/pysr/feature_selection.py
index a0e4d207..8c8358fd 100644
--- a/pysr/feature_selection.py
+++ b/pysr/feature_selection.py
@@ -1,7 +1,5 @@
 """Functions for doing feature selection during preprocessing."""
 
-from __future__ import annotations
-
 from typing import cast
 
 import numpy as np
diff --git a/pysr/julia_helpers.py b/pysr/julia_helpers.py
index 917c4fd3..a93b6265 100644
--- a/pysr/julia_helpers.py
+++ b/pysr/julia_helpers.py
@@ -1,12 +1,6 @@
 """Functions for initializing the Julia environment and installing deps."""
 
-import sys
-from typing import Any, cast, overload
-
-if sys.version_info >= (3, 10):
-    from typing import Callable
-else:
-    from collections.abc import Callable
+from typing import Any, Callable, cast, overload
 
 import numpy as np
 from juliacall import convert as jl_convert  # type: ignore
diff --git a/pysr/sr.py b/pysr/sr.py
index 6dc5169f..2c7d7653 100644
--- a/pysr/sr.py
+++ b/pysr/sr.py
@@ -1,7 +1,5 @@
 """Define the PySRRegressor scikit-learn interface."""
 
-from __future__ import annotations
-
 import copy
 import os
 import pickle as pkl
@@ -9,17 +7,13 @@
 import sys
 import tempfile
 import warnings
+from collections.abc import Callable
 from dataclasses import dataclass, fields
 from io import StringIO
 from multiprocessing import cpu_count
 from pathlib import Path
 from typing import Any, Literal, cast
 
-if sys.version_info >= (3, 10):
-    from collections.abc import Callable
-else:
-    from typing import Callable
-
 import numpy as np
 import pandas as pd
 from numpy import ndarray