diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index eb0acdf1..19a9a4ae 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9, '3.10', 3.11, 3.12, 3.13, 3.14, 3.13t, 3.14t]
+        python-version: ['3.10', 3.11, 3.12, 3.13, 3.14, 3.13t, 3.14t]
         nogmpy: [false]
         purepy: [false]
         include:
diff --git a/README.rst b/README.rst
index fc44100f..20915a08 100644
--- a/README.rst
+++ b/README.rst
@@ -114,8 +114,8 @@ Release history:
 1. Download & installation
 --------------------------
 
-Mpmath requires Python 3.9 or later versions.  It has been tested with CPython
-3.9 through 3.14 and for PyPy 3.11.
+Mpmath requires Python 3.10 or later versions.  It has been tested with CPython
+3.10 through 3.14 and for PyPy 3.11.
 
 The latest release of mpmath can be downloaded from the mpmath
 website and from https://github.com/mpmath/mpmath/releases
diff --git a/docs/setup.rst b/docs/setup.rst
index 7d779cf1..3b6ea11c 100644
--- a/docs/setup.rst
+++ b/docs/setup.rst
@@ -1,7 +1,7 @@
 Setting up mpmath
 =================
 
-Mpmath requires at least Python 3.9.  It has been tested with CPython 3.9
+Mpmath requires at least Python 3.10.  It has been tested with CPython 3.10
 through 3.14 and for PyPy 3.11.
 
 Download and installation
diff --git a/mpmath/libmp/libmpf.py b/mpmath/libmp/libmpf.py
index 4e652b5f..4e2479a9 100644
--- a/mpmath/libmp/libmpf.py
+++ b/mpmath/libmp/libmpf.py
@@ -460,11 +460,7 @@ def mpf_hash(s):
 
     # Handle special numbers
     if not sman:
-        if s == fnan:
-            if sys.version_info >= (3, 10):
-                return object.__hash__(s)
-            else:
-                return sys.hash_info.nan
+        if s == fnan: return object.__hash__(s)
         if s == finf: return sys.hash_info.inf
         if s == fninf: return -sys.hash_info.inf
 
diff --git a/mpmath/tests/test_format.py b/mpmath/tests/test_format.py
index 896c003c..a4cc4f2a 100644
--- a/mpmath/tests/test_format.py
+++ b/mpmath/tests/test_format.py
@@ -11,9 +11,6 @@ from mpmath import fp, inf, mp, nan, ninf, workdps
 from mpmath.libmp.libmpf import read_format_spec
 
 
-vinfo = sys.version_info
-
-
 @st.composite
 def fmt_str(draw, types='fFeE', for_complex=False):
     res = ''
@@ -41,7 +38,7 @@ def fmt_str(draw, types='fFeE', for_complex=False):
     res += draw(st.sampled_from([''] + list('-+ ')))
 
     # no_neg_0 (not used yet.)
-    if vinfo >= (3, 11):
+    if sys.version_info >= (3, 11):
         res += draw(st.sampled_from([''] + ['z']))
 
     # alternate mode
@@ -71,7 +68,7 @@ def fmt_str(draw, types='fFeE', for_complex=False):
                 + ['0' + str(_) for _ in range(40)]))
     if prec:
         res += '.' + prec
-        if vinfo >= (3, 14):
+        if sys.version_info >= (3, 14):
             gchar = draw(st.sampled_from([''] + list(',_')))
             res += gchar
 
@@ -501,7 +498,7 @@ def test_mpf_floats_bulk(fmt, x):
     if not x and math.copysign(1, x) == -1:
         return  # skip negative zero
     spec = read_format_spec(fmt)
-    if spec['frac_separators'] and vinfo < (3, 14):
+    if spec['frac_separators'] and sys.version_info < (3, 14):
         mp.pretty_dps = "str"
         return  # see also python/cpython#130860
     if not spec['type'] and spec['precision'] < 0 and math.isfinite(x):
@@ -526,7 +523,7 @@ def test_mpc_complexes(fmt, z):
             or (not z.imag and math.copysign(1, z.imag) == -1)):
         return  # skip negative zero
     spec = read_format_spec(fmt)
-    if spec['frac_separators'] and vinfo < (3, 14):
+    if spec['frac_separators'] and sys.version_info < (3, 14):
         return  # see also python/cpython#130860
     if spec['precision'] < 0 and any(math.isfinite(_) for _ in [z.real, z.imag]):
         # The mpmath could choose a different decimal
diff --git a/mpmath/tests/test_visualization.py b/mpmath/tests/test_visualization.py
index e4083414..0207d100 100644
--- a/mpmath/tests/test_visualization.py
+++ b/mpmath/tests/test_visualization.py
@@ -9,7 +9,6 @@ import pytest
 from mpmath import fp, mp
 
 
-@pytest.mark.filterwarnings("ignore:.*:DeprecationWarning")
 def test_axes():
     try:
         import matplotlib
diff --git a/pyproject.toml b/pyproject.toml
index 6f688aac..b8e0511d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,6 @@ classifiers = ['Topic :: Scientific/Engineering :: Mathematics',
                'Programming Language :: Python',
                'Programming Language :: Python :: 3',
                'Programming Language :: Python :: 3 :: Only',
-               'Programming Language :: Python :: 3.9',
                'Programming Language :: Python :: 3.10',
                'Programming Language :: Python :: 3.11',
                'Programming Language :: Python :: 3.12',
@@ -22,7 +21,7 @@ classifiers = ['Topic :: Scientific/Engineering :: Mathematics',
                'Programming Language :: Python :: Implementation :: CPython',
                'Programming Language :: Python :: Implementation :: PyPy']
 dynamic = ['version']
-requires-python = '>=3.9'
+requires-python = '>=3.10'
 readme = 'README.rst'
 
 [project.urls]