diff --git a/.azure-pipelines/templates/jobs/extended-tests-jobs.yml b/.azure-pipelines/templates/jobs/extended-tests-jobs.yml
index 0ba02a9b7..5aa9fcb12 100644
--- a/.azure-pipelines/templates/jobs/extended-tests-jobs.yml
+++ b/.azure-pipelines/templates/jobs/extended-tests-jobs.yml
@@ -8,12 +8,6 @@ jobs:
       - group: certbot-common
     strategy:
       matrix:
-        linux-py39:
-          PYTHON_VERSION: 3.9
-          TOXENV: py39
-        linux-py310:
-          PYTHON_VERSION: 3.10
-          TOXENV: py310
         linux-py311:
           PYTHON_VERSION: 3.11
           TOXENV: py311
@@ -23,14 +17,11 @@ jobs:
         linux-isolated:
           TOXENV: 'isolated-acme,isolated-certbot,isolated-apache,isolated-cloudflare,isolated-digitalocean,isolated-dnsimple,isolated-dnsmadeeasy,isolated-gehirn,isolated-google,isolated-linode,isolated-luadns,isolated-nsone,isolated-ovh,isolated-rfc2136,isolated-route53,isolated-sakuracloud,isolated-nginx'
         linux-integration-certbot-oldest:
-          PYTHON_VERSION: 3.9
+          PYTHON_VERSION: 3.10
           TOXENV: integration-certbot-oldest
         linux-integration-nginx-oldest:
-          PYTHON_VERSION: 3.9
+          PYTHON_VERSION: 3.10
           TOXENV: integration-nginx-oldest
-        linux-py39-integration:
-          PYTHON_VERSION: 3.9
-          TOXENV: integration
         linux-py310-integration:
           PYTHON_VERSION: 3.10
           TOXENV: integration
diff --git a/.azure-pipelines/templates/jobs/standard-tests-jobs.yml b/.azure-pipelines/templates/jobs/standard-tests-jobs.yml
index 2a589bc2f..b26333dd7 100644
--- a/.azure-pipelines/templates/jobs/standard-tests-jobs.yml
+++ b/.azure-pipelines/templates/jobs/standard-tests-jobs.yml
@@ -12,13 +12,13 @@ jobs:
           PIP_USE_PEP517: "true"
         linux-oldest:
           IMAGE_NAME: ubuntu-22.04
-          PYTHON_VERSION: 3.9
+          PYTHON_VERSION: 3.10
           TOXENV: oldest
-        linux-py39:
+        linux-py310:
           # linux unit tests with the oldest python we support
           IMAGE_NAME: ubuntu-22.04
-          PYTHON_VERSION: 3.9
-          TOXENV: py39
+          PYTHON_VERSION: 3.10
+          TOXENV: py310
         linux-cover:
           # linux unit+cover tests with the newest python we support
           IMAGE_NAME: ubuntu-22.04
diff --git a/acme/setup.py b/acme/setup.py
index c3117c612..d0b5d6fb1 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -32,14 +32,13 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/acme/src/acme/__init__.py b/acme/src/acme/__init__.py
index bd48fbfcd..405a45252 100644
--- a/acme/src/acme/__init__.py
+++ b/acme/src/acme/__init__.py
@@ -6,7 +6,6 @@ This module is an implementation of the `ACME protocol`_.
 
 """
 import sys
-import warnings
 
 # This code exists to keep backwards compatibility with people using acme.jose
 # before it became the standalone josepy package.
@@ -20,10 +19,3 @@ for mod in list(sys.modules):
     # preserved (acme.jose.* is josepy.*)
     if mod == 'josepy' or mod.startswith('josepy.'):
         sys.modules['acme.' + mod.replace('josepy', 'jose', 1)] = sys.modules[mod]
-
-if sys.version_info[:2] == (3, 9):
-    warnings.warn(
-            "Python 3.9 support will be dropped in the next planned release of "
-            "acme. Please upgrade your Python version.",
-            DeprecationWarning,
-    )  # pragma: no cover
diff --git a/certbot-apache/setup.py b/certbot-apache/setup.py
index 6ffce4f3f..a668c21aa 100644
--- a/certbot-apache/setup.py
+++ b/certbot-apache/setup.py
@@ -28,7 +28,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -37,7 +37,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-ci/setup.py b/certbot-ci/setup.py
index 0e2aa359e..ce1ede342 100644
--- a/certbot-ci/setup.py
+++ b/certbot-ci/setup.py
@@ -31,14 +31,13 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 3 - Alpha',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-compatibility-test/setup.py b/certbot-compatibility-test/setup.py
index 81f600353..034b7b488 100644
--- a/certbot-compatibility-test/setup.py
+++ b/certbot-compatibility-test/setup.py
@@ -18,14 +18,13 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 3 - Alpha',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-cloudflare/setup.py b/certbot-dns-cloudflare/setup.py
index 40f91b4c0..e37111231 100644
--- a/certbot-dns-cloudflare/setup.py
+++ b/certbot-dns-cloudflare/setup.py
@@ -39,7 +39,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -48,7 +48,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-digitalocean/setup.py b/certbot-dns-digitalocean/setup.py
index e6574dce4..0b143a040 100644
--- a/certbot-dns-digitalocean/setup.py
+++ b/certbot-dns-digitalocean/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-dnsimple/setup.py b/certbot-dns-dnsimple/setup.py
index 177e1ceea..a05eb0245 100644
--- a/certbot-dns-dnsimple/setup.py
+++ b/certbot-dns-dnsimple/setup.py
@@ -39,7 +39,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -48,7 +48,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-dnsmadeeasy/setup.py b/certbot-dns-dnsmadeeasy/setup.py
index f16a40454..11570149f 100644
--- a/certbot-dns-dnsmadeeasy/setup.py
+++ b/certbot-dns-dnsmadeeasy/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-gehirn/setup.py b/certbot-dns-gehirn/setup.py
index 50ebf6e07..9af3b123f 100644
--- a/certbot-dns-gehirn/setup.py
+++ b/certbot-dns-gehirn/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-google/setup.py b/certbot-dns-google/setup.py
index 424026e67..7abe4fb63 100644
--- a/certbot-dns-google/setup.py
+++ b/certbot-dns-google/setup.py
@@ -38,7 +38,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -47,7 +47,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-linode/setup.py b/certbot-dns-linode/setup.py
index 606725345..4611587b9 100644
--- a/certbot-dns-linode/setup.py
+++ b/certbot-dns-linode/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-luadns/setup.py b/certbot-dns-luadns/setup.py
index fda460a3a..64e479d84 100644
--- a/certbot-dns-luadns/setup.py
+++ b/certbot-dns-luadns/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-nsone/setup.py b/certbot-dns-nsone/setup.py
index 32d121e65..85da1300f 100644
--- a/certbot-dns-nsone/setup.py
+++ b/certbot-dns-nsone/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-ovh/setup.py b/certbot-dns-ovh/setup.py
index a40349d28..15a102311 100644
--- a/certbot-dns-ovh/setup.py
+++ b/certbot-dns-ovh/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-rfc2136/setup.py b/certbot-dns-rfc2136/setup.py
index 4f7f71830..68bfb426c 100644
--- a/certbot-dns-rfc2136/setup.py
+++ b/certbot-dns-rfc2136/setup.py
@@ -40,7 +40,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -49,7 +49,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-route53/setup.py b/certbot-dns-route53/setup.py
index 54cd7f69c..4cbdfa9b2 100644
--- a/certbot-dns-route53/setup.py
+++ b/certbot-dns-route53/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-dns-sakuracloud/setup.py b/certbot-dns-sakuracloud/setup.py
index 1ebb9b0ee..688fac8a3 100644
--- a/certbot-dns-sakuracloud/setup.py
+++ b/certbot-dns-sakuracloud/setup.py
@@ -37,7 +37,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot-nginx/setup.py b/certbot-nginx/setup.py
index baaaf7164..82a59b5d3 100644
--- a/certbot-nginx/setup.py
+++ b/certbot-nginx/setup.py
@@ -27,7 +27,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -36,7 +36,6 @@ setup(
         'Operating System :: POSIX :: Linux',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/certbot/pyproject.toml b/certbot/pyproject.toml
index 942d142ce..578cacb23 100644
--- a/certbot/pyproject.toml
+++ b/certbot/pyproject.toml
@@ -8,7 +8,7 @@ dynamic = ["version", "dependencies"]
 description = "ACME client"
 readme = "README.rst"
 license = "Apache-2.0"
-requires-python = ">=3.9.2"
+requires-python = ">=3.10"
 authors = [
     { name = "Certbot Project", email = "certbot-dev@eff.org" },
 ]
@@ -19,11 +19,10 @@ classifiers = [
     "Operating System :: POSIX :: Linux",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.13",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Internet :: WWW/HTTP",
     "Topic :: Security",
     "Topic :: System :: Installation/Setup",
diff --git a/certbot/src/certbot/__init__.py b/certbot/src/certbot/__init__.py
index 07bf1f61d..1247fcd3d 100644
--- a/certbot/src/certbot/__init__.py
+++ b/certbot/src/certbot/__init__.py
@@ -1,14 +1,4 @@
 """Certbot client."""
-import sys
-import warnings
 
 # version number like 1.2.3a0, must have at least 2 parts, like 1.2
 __version__ = '5.0.0.dev0'
-
-
-if sys.version_info[:2] == (3, 9):
-    warnings.warn(
-            "Python 3.9 support will be dropped in the next planned release of "
-            "certbot. Please upgrade your Python version.",
-            DeprecationWarning,
-    )  # pragma: no cover
diff --git a/certbot/src/certbot/_internal/main.py b/certbot/src/certbot/_internal/main.py
index e26447be6..ed776d8a7 100644
--- a/certbot/src/certbot/_internal/main.py
+++ b/certbot/src/certbot/_internal/main.py
@@ -1864,10 +1864,6 @@ def main(cli_args: Optional[list[str]] = None) -> Optional[Union[str, int]]:
         if config.func != plugins_cmd:  # pylint: disable=comparison-with-callable
             raise
 
-    if sys.version_info[:2] == (3, 9):
-        logger.warning("Python 3.9 support will be dropped in the next planned release "
-                       "of Certbot - please upgrade your Python version.")
-
     with make_displayer(config) as displayer:
         display_obj.set_display(displayer)
 
diff --git a/letstest/scripts/test_apache2.sh b/letstest/scripts/test_apache2.sh
index b94a36204..915615e44 100755
--- a/letstest/scripts/test_apache2.sh
+++ b/letstest/scripts/test_apache2.sh
@@ -48,10 +48,8 @@ eval "$(pyenv init --path)"
 eval "$(pyenv init -)"
 
 # Install and configure Python
-# Python<=3.9 must be used because Python 3.10 requires too new of a version of
-# OpenSSL.
-pyenv install 3.9.10
-pyenv shell 3.9.10
+pyenv install 3.10
+pyenv shell 3.10
 
 tools/venv.py -e acme -e certbot -e certbot-apache -e certbot-ci tox
 PEBBLE_LOGS="acme_server.log"
@@ -92,18 +90,10 @@ sudo "venv/bin/certbot" -v --debug --text --agree-tos --no-verify-ssl \
                    --renew-by-default --redirect --register-unsafely-without-email \
                    --domain "${PUBLIC_HOSTNAME}" --server "${PEBBLE_URL}"
 
-# Check that ssl_module detection is working on various systems
-if [ "$OS_TYPE" = "ubuntu" ] ; then
-    MOD_SSL_LOCATION="/usr/lib/apache2/modules/mod_ssl.so"
-    APACHE_NAME=apache2ctl
-elif [ "$OS_TYPE" = "centos" ]; then
-    MOD_SSL_LOCATION="/etc/httpd/modules/mod_ssl.so"
-    APACHE_NAME=httpd
+if ! grep -q SSLSessionTickets /etc/letsencrypt/options-ssl-apache.conf; then
+    echo "modern TLS options were not used"
+    exit 1
 fi
-OPENSSL_VERSION=$(strings "$MOD_SSL_LOCATION" | egrep -o -m1 '^OpenSSL ([0-9]\.[^ ]+) ' | tail -c +9)
-APACHE_VERSION=$(sudo $APACHE_NAME -v | egrep -o 'Apache/([0-9]\.[^ ]+)' | tail -c +8)
-"venv/bin/python" letstest/scripts/test_openssl_version.py "$OPENSSL_VERSION" "$APACHE_VERSION"
-
 
 if [ "$OS_TYPE" = "ubuntu" ] ; then
     export SERVER="${PEBBLE_URL}"
diff --git a/letstest/scripts/test_openssl_version.py b/letstest/scripts/test_openssl_version.py
deleted file mode 100644
index 94648c40c..000000000
--- a/letstest/scripts/test_openssl_version.py
+++ /dev/null
@@ -1,31 +0,0 @@
-#!/usr/bin/env python
-# Test script for OpenSSL version checking
-import sys
-
-from certbot import util
-
-
-def main(openssl_version, apache_version):
-    if not openssl_version.strip():
-        raise Exception("No OpenSSL version found.")
-    if not apache_version.strip():
-        raise Exception("No Apache version found.")
-    conf_file_location = "/etc/letsencrypt/options-ssl-apache.conf"
-    with open(conf_file_location) as f:
-        contents = f.read()
-    if util.parse_loose_version(apache_version.strip()) < util.parse_loose_version('2.4.11') or \
-        util.parse_loose_version(openssl_version.strip()) < util.parse_loose_version('1.0.2l'):
-        # should be old version
-        # assert SSLSessionTickets not in conf file
-        if "SSLSessionTickets" in contents:
-            raise Exception("Apache or OpenSSL version is too old, "
-                "but SSLSessionTickets is set.")
-    else:
-        # should be current version
-        # assert SSLSessionTickets in conf file
-        if "SSLSessionTickets" not in contents:
-            raise Exception("Apache and OpenSSL versions are sufficiently new, "
-                "but SSLSessionTickets is not set.")
-
-if __name__ == '__main__':
-    main(*sys.argv[1:])
diff --git a/letstest/setup.py b/letstest/setup.py
index aeede0003..ba687aff2 100644
--- a/letstest/setup.py
+++ b/letstest/setup.py
@@ -9,14 +9,13 @@ setup(
     author='Certbot Project',
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
diff --git a/newsfragments/10389.changed b/newsfragments/10389.changed
new file mode 100644
index 000000000..4a7232179
--- /dev/null
+++ b/newsfragments/10389.changed
@@ -0,0 +1 @@
+Python 3.9 support was removed.
diff --git a/pytest.ini b/pytest.ini
index be9c816bf..dbc0d77fb 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -21,11 +21,9 @@
 #    from dateutil. See https://github.com/dateutil/dateutil/issues/1314.
 # 4) Planning to remove support for checking OCSP via OpenSSL binary.
 #     See https://github.com/certbot/certbot/issues/10291.
-# 5) Ignore our own DeprecationWarning about Python 3.9 soon to be dropped.
 filterwarnings =
     error
     ignore:.*rsyncdir:DeprecationWarning
     ignore:'urllib3.contrib.pyopenssl:DeprecationWarning:requests_toolbelt
     ignore:.*datetime.utcfromtimestamp\(\) is deprecated:DeprecationWarning:dateutil
     ignore:enforce_openssl_binary_usage parameter is deprecated:DeprecationWarning
-    ignore:Python 3.9 support will be dropped:DeprecationWarning
diff --git a/tools/pinning/current/pyproject.toml b/tools/pinning/current/pyproject.toml
index db270dab4..9b6d257db 100644
--- a/tools/pinning/current/pyproject.toml
+++ b/tools/pinning/current/pyproject.toml
@@ -6,11 +6,7 @@ authors = ["Certbot Project"]
 license = "Apache License 2.0"
 
 [tool.poetry.dependencies]
-# python 3.9.2 is used as a lower bound here because newer versions of
-# cryptography dropped support for python 3.9.0 and 3.9.1. see
-# https://github.com/pyca/cryptography/pull/12045. when we drop support for
-# python 3.9 altogether, this line can be changed to the simpler 'python = "^3.10"'.
-python = ">=3.9.2,<4.0"
+python = "^3.10"
 
 # Local dependencies
 # Any local packages that have dependencies on other local packages must be
diff --git a/tools/pinning/oldest/pyproject.toml b/tools/pinning/oldest/pyproject.toml
index fcbd23ac8..c84f52394 100644
--- a/tools/pinning/oldest/pyproject.toml
+++ b/tools/pinning/oldest/pyproject.toml
@@ -18,7 +18,7 @@ license = "Apache License 2.0"
 [tool.poetry.dependencies]
 # The Python version here should be kept in sync with the one used in our
 # oldest tests in tox.ini.
-python = "<3.10 >= 3.9.2"
+python = "<3.11 >= 3.10"
 
 # Local dependencies
 # Any local packages that have dependencies on other local packages must be
diff --git a/tools/venv.py b/tools/venv.py
index d8165f089..668689ee1 100755
--- a/tools/venv.py
+++ b/tools/venv.py
@@ -116,7 +116,7 @@ def _check_version(version_str):
 
     version = (int(search.group(1)), int(search.group(2)))
 
-    if version >= (3, 9):
+    if version >= (3, 10):
         return True
 
     print('Incompatible python version for Certbot found: {0}'.format(version_str))
diff --git a/tox.ini b/tox.ini
index f74c56d99..bf6e14a44 100644
--- a/tox.ini
+++ b/tox.ini
@@ -52,10 +52,10 @@ commands =
 commands =
     {[base]pytest} acme certbot certbot-dns-cloudflare certbot-dns-digitalocean certbot-dns-dnsimple certbot-dns-dnsmadeeasy certbot-dns-gehirn certbot-dns-google certbot-dns-linode certbot-dns-luadns certbot-dns-nsone certbot-dns-ovh certbot-dns-rfc2136 certbot-dns-route53 certbot-dns-sakuracloud certbot-nginx certbot-apache
 
-[testenv:py3{,9,10,11,12,13}]
+[testenv:py3{,10,11,12,13}]
 commands = {[testenv:py]commands}
 
-[testenv:py3.{9,10,11,12,13}]
+[testenv:py3.{10,11,12,13}]
 commands = {[testenv:py]commands}
 
 [testenv:oldest]
@@ -65,7 +65,7 @@ commands = {[testenv:py]commands}
 #
 # This version should be kept in sync with the one declared in
 # tools/pinning/oldest/pyproject.toml.
-basepython = python3.9
+basepython = python3.10
 setenv = CERTBOT_OLDEST=1
 commands = {[testenv:py]commands}