diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index ad9f7ff2..f4bbd8e7 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -15,7 +15,6 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - '3.9'
           - '3.13'
     steps:
       - uses: actions/checkout@v4
diff --git a/README.md b/README.md
index 0f6c9a19..da5a88ea 100644
--- a/README.md
+++ b/README.md
@@ -45,14 +45,6 @@ psycopg2 also requires libpq-dev:
 Configurations from this repository are applied from the `master` branch on
 a `*/15` cron interval using the `update-master` target in `Makefile`.
 
-Python 3.9 is installed manually using ``pyenv`` (which was also installed
-manually). Commands to install Python 3.9:
-
-    pyenv update
-    pyenv install 3.9.1
-    pyenv global 3.8.1 3.9.1
-
-
 ## Add a worker
 
 The list of workers is stored in `/etc/buildbot/settings.yaml` on the server.
diff --git a/master/custom/builders.py b/master/custom/builders.py
index 2ab8eb26..89df362e 100644
--- a/master/custom/builders.py
+++ b/master/custom/builders.py
@@ -10,7 +10,6 @@
     UnixAsanDebugBuild,
     UnixBigmemBuild,
     UnixTraceRefsBuild,
-    UnixVintageParserBuild,
     UnixRefleakBuild,
     UnixNoGilBuild,
     UnixNoGilRefleakBuild,
@@ -217,8 +216,6 @@
 
     ("AMD64 Ubuntu", "skumaran-ubuntu-x86_64", UnixBuild),
 
-    ("AMD64 Arch Linux VintageParser", "pablogsal-arch-x86_64", UnixVintageParserBuild),
-
     ("AMD64 RHEL8 FIPS No Builtin Hashes", "cstratak-RHEL8-fips-x86_64", RHEL8NoBuiltinHashesUnixBuild),
 
     ("AMD64 CentOS9", "cstratak-CentOS9-x86_64", CentOS9Build),
diff --git a/master/custom/factories.py b/master/custom/factories.py
index 9a3f9460..e832ac42 100644
--- a/master/custom/factories.py
+++ b/master/custom/factories.py
@@ -77,9 +77,9 @@ def setup(self, parallel, branch, test_with_PTY=False, **kwargs):
         # Adjust the timeout for this worker
         self.test_timeout *= kwargs.get("timeout_factor", 1)
 
-        # In 3.9 and 3.10, test_asyncio wasn't split out, and refleaks tests
+        # In 3.10, test_asyncio wasn't split out, and refleaks tests
         # need more time.
-        if branch in ("3.9", "3.10") and has_option("-R", self.testFlags):
+        if branch == "3.10" and has_option("-R", self.testFlags):
             self.test_timeout *= 2
 
         if self.build_out_of_tree:
@@ -159,11 +159,6 @@ def setup(self, parallel, branch, test_with_PTY=False, **kwargs):
         return super().setup(parallel, branch, test_with_PTY=test_with_PTY, **kwargs)
 
 
-class UnixVintageParserBuild(UnixBuild):
-    buildersuffix = ".oldparser"  # to get unique directory names on master
-    test_environ = {'PYTHONOLDPARSER': 'old'}
-
-
 class UnixRefleakBuild(UnixBuild):
     buildersuffix = ".refleak"
     testFlags = ["-R", "3:3", "-u-cpu"]
@@ -308,17 +303,9 @@ class NonDebugUnixBuild(UnixBuild):
 
 class PGOUnixBuild(NonDebugUnixBuild):
     buildersuffix = ".pgo"
-    configureFlags = ["--enable-optimizations"]
+    configureFlags = ["--enable-optimizations", "--with-readline=edit"]
     factory_tags = ["pgo"]
 
-    def setup(self, parallel, branch, *args, **kwargs):
-        # Only Python >3.10 has --with-readline=edit
-        if branch != '3.9':
-            # Use libedit instead of libreadline on this buildbot for
-            # some libedit Linux compilation coverage.
-            self.configureFlags = self.configureFlags + ["--with-readline=edit"]
-        return super().setup(parallel, branch, *args, **kwargs)
-
 
 class ClangUnixBuild(UnixBuild):
     buildersuffix = ".clang"
diff --git a/master/custom/workers.py b/master/custom/workers.py
index bf151fd6..8c7892ec 100644
--- a/master/custom/workers.py
+++ b/master/custom/workers.py
@@ -86,7 +86,7 @@ def get_workers(settings):
             name="cstratak-RHEL8-x86_64",
             tags=['linux', 'unix', 'rhel', 'amd64', 'x86-64'],
             parallel_tests=10,
-            branches=['3.9', '3.10', '3.11', '3.12'],
+            branches=['3.10', '3.11', '3.12'],
         ),
         cpw(
             name="cstratak-RHEL8-fips-x86_64",
@@ -105,7 +105,7 @@ def get_workers(settings):
             tags=['linux', 'unix', 'rhel', 'amd64', 'x86-64', 'fips'],
             parallel_tests=6,
             # Only 3.12+ for FIPS builder
-            not_branches=["3.9", "3.10", "3.11"],
+            not_branches=["3.10", "3.11"],
         ),
         cpw(
             name="cstratak-fedora-rawhide-ppc64le",
@@ -121,7 +121,7 @@ def get_workers(settings):
             name="cstratak-RHEL8-ppc64le",
             tags=['linux', 'unix', 'rhel', 'ppc64le'],
             parallel_tests=10,
-            branches=['3.9', '3.10', '3.11', '3.12'],
+            branches=['3.10', '3.11', '3.12'],
         ),
         cpw(
             name="cstratak-CentOS9-ppc64le",
@@ -142,7 +142,7 @@ def get_workers(settings):
             name="cstratak-RHEL8-aarch64",
             tags=['linux', 'unix', 'rhel', 'arm', 'arm64', 'aarch64'],
             parallel_tests=40,
-            branches=['3.9', '3.10', '3.11', '3.12'],
+            branches=['3.10', '3.11', '3.12'],
         ),
         cpw(
             name="cstratak-CentOS9-aarch64",
@@ -152,7 +152,7 @@ def get_workers(settings):
         cpw(
             name="diegorusso-aarch64-bigmem",
             tags=['linux', 'unix', 'ubuntu', 'arm', 'arm64', 'aarch64', 'bigmem'],
-            not_branches=['3.9', '3.10', '3.11', '3.12', '3.13', '3.14'],
+            not_branches=['3.10', '3.11', '3.12', '3.13', '3.14'],
             parallel_tests=8,
         ),
         cpw(
@@ -169,7 +169,7 @@ def get_workers(settings):
             name="cstratak-rhel8-s390x",
             tags=['linux', 'unix', 'rhel', 's390x'],
             parallel_tests=10,
-            branches=['3.9', '3.10', '3.11', '3.12'],
+            branches=['3.10', '3.11', '3.12'],
         ),
         cpw(
             name="cstratak-rhel9-s390x",
@@ -193,7 +193,7 @@ def get_workers(settings):
                   'aarch64', 'arm'],
             parallel_tests=4,
             # Tests fail with latin1 encoding on 3.12, probably earlier
-            not_branches=['3.12', '3.11', '3.10', '3.9']
+            not_branches=['3.12', '3.11', '3.10']
         ),
         cpw(
             name="savannah-raspbian",
@@ -227,7 +227,7 @@ def get_workers(settings):
         cpw(
             name="ware-alpine",
             tags=['linux', 'unix', 'alpine', 'docker', 'amd64', 'x86-64', 'musl'],
-            not_branches=['3.9', '3.10', '3.11', '3.12', '3.13'],
+            not_branches=['3.10', '3.11', '3.12', '3.13'],
         ),
         cpw(
             name="ware-freebsd",
@@ -262,77 +262,77 @@ def get_workers(settings):
         cpw(
             name="bcannon-wasi",
             tags=['wasm', 'wasi'],
-            not_branches=['3.9', '3.10'],
+            not_branches=['3.10'],
             parallel_tests=2,
             parallel_builders=2,
         ),
         cpw(
             name="ambv-bb-win11",
             tags=['windows', 'win11', 'amd64', 'x86-64', 'bigmem'],
-            not_branches=['3.9', '3.10', '3.11', '3.12', '3.13'],
+            not_branches=['3.10', '3.11', '3.12', '3.13'],
             parallel_tests=4,
         ),
         cpw(
             name="itamaro-centos-aws",
             tags=['linux', 'unix', 'rhel', 'amd64', 'x86-64'],
-            not_branches=['3.9', '3.10', '3.11', '3.12'],
+            not_branches=['3.10', '3.11', '3.12'],
             parallel_tests=10,
             parallel_builders=2,
         ),
         cpw(
             name="itamaro-win64-srv-22-aws",
             tags=['windows', 'win-srv-22', 'amd64', 'x86-64'],
-            not_branches=['3.9', '3.10', '3.11', '3.12'],
+            not_branches=['3.10', '3.11', '3.12'],
             parallel_tests=10,
             parallel_builders=2,
         ),
         cpw(
             name="itamaro-macos-intel-aws",
             tags=['macOS', 'unix', 'amd64', 'x86-64'],
-            not_branches=['3.9', '3.10', '3.11', '3.12'],
+            not_branches=['3.10', '3.11', '3.12'],
             parallel_tests=10,
         ),
         cpw(
             name="itamaro-macos-arm64-aws",
             tags=['macOS', 'unix', 'arm', 'arm64'],
-            not_branches=['3.9', '3.10', '3.11', '3.12'],
+            not_branches=['3.10', '3.11', '3.12'],
             parallel_tests=10,
         ),
         cpw(
             name="kushaldas-wasi",
             tags=['wasm', 'wasi'],
-            not_branches=['3.9', '3.10'],
+            not_branches=['3.10'],
             parallel_tests=4,
             parallel_builders=2,
         ),
         cpw(
             name="onder-riscv64",
             tags=['linux', 'unix', 'ubuntu', 'riscv64'],
-            not_branches=['3.9', '3.10'],
+            not_branches=['3.10'],
             parallel_tests=4,
         ),
         cpw(
             name="rkm-arm64-ios-simulator",
             tags=['iOS'],
-            not_branches=['3.9', '3.10', '3.11', '3.12'],
+            not_branches=['3.10', '3.11', '3.12'],
             parallel_builders=1,  # All builds use the same simulator
         ),
         cpw(
             name="rkm-emscripten",
             tags=['emscripten'],
-            not_branches=['3.9', '3.10', '3.11', '3.12', '3.13'],
+            not_branches=['3.10', '3.11', '3.12', '3.13'],
             parallel_builders=4,
         ),
         cpw(
             name="mhsmith-android-aarch64",
             tags=['android'],
-            not_branches=['3.9', '3.10', '3.11', '3.12'],
+            not_branches=['3.10', '3.11', '3.12'],
             parallel_builders=1,  # All builds use the same emulator and app ID.
         ),
         cpw(
             name="mhsmith-android-x86_64",
             tags=['android'],
-            not_branches=['3.9', '3.10', '3.11', '3.12'],
+            not_branches=['3.10', '3.11', '3.12'],
             parallel_builders=1,  # All builds use the same emulator and app ID.
         ),
     ]
diff --git a/master/master.cfg b/master/master.cfg
index 3890f252..6615b76a 100644
--- a/master/master.cfg
+++ b/master/master.cfg
@@ -138,7 +138,6 @@ git_branches = [
     (git_url, "3.12", "3.12"),
     (git_url, "3.11", "3.11"),
     (git_url, "3.10", "3.10"),
-    (git_url, "3.9", "3.9"),
 ]
 
 # common Git() and GitHub() keyword arguments
@@ -257,9 +256,6 @@ for branch_num, (git_url, branchname, git_branch) in enumerate(git_branches):
             # Workers known to be broken on older branches: let's focus on
             # supporting these platforms in the main branch.
             continue
-        # Only 3.9 has two parsers mode from Python 3.9 and higher
-        if "VintageParser" in name and branchname != "3.9":
-            continue
 
         worker = WORKERS_BY_NAME[worker_name]
         if worker.not_branches and branchname in worker.not_branches:
@@ -282,7 +278,7 @@ for branch_num, (git_url, branchname, git_branch) in enumerate(git_branches):
         # Only 3.11+ for WebAssembly builds
         if "wasm" in tags:
             # WASM wasn't a supported platform until 3.11.
-            if branchname in {"3.9", "3.10"}:
+            if branchname in {"3.10"}:
                 continue
             # Tier 3 support is 3.11 & 3.12.
             elif "nondebug" in tags and branchname not in {"3.11", "3.12"}:
@@ -292,7 +288,7 @@ for branch_num, (git_url, branchname, git_branch) in enumerate(git_branches):
                 continue
 
         # Only 3.13+ for NoGIL builds
-        if 'nogil' in tags and branchname in {"3.9", "3.10", "3.11", "3.12"}:
+        if 'nogil' in tags and branchname in {"3.10", "3.11", "3.12"}:
             continue
 
         if 'refleak' in tags:
diff --git a/requirements-3.9.txt b/requirements-3.9.txt
deleted file mode 100644
index dd84e9dc..00000000
--- a/requirements-3.9.txt
+++ /dev/null
@@ -1,57 +0,0 @@
-alembic==1.16.5
-attrs==25.3.0
-autobahn==24.4.2
-Automat==25.4.16
-blinker==1.9.0
-buildbot==4.3.0
-buildbot-console-view==4.3.0
-buildbot-grid-view==4.3.0
-buildbot-waterfall-view==4.3.0
-buildbot-worker==4.3.0
-buildbot-wsgi-dashboards==4.3.0
-buildbot-www==4.3.0
-certifi==2025.8.3
-cffi==2.0.0
-charset-normalizer==3.4.3
-click==8.1.8
-constantly==23.10.4
-croniter==6.0.0
-cryptography==45.0.7
-Flask==3.1.2
-greenlet==3.2.4
-humanize==4.13.0
-hyperlink==21.0.0
-idna==3.10
-importlib_metadata==8.7.0
-incremental==24.7.2
-itsdangerous==2.2.0
-Jinja2==3.1.6
-Mako==1.3.10
-MarkupSafe==3.0.2
-msgpack==1.1.1
-multipart==1.3.0
-packaging==25.0
-psycopg2==2.9.10
-pyasn1==0.6.1
-pyasn1_modules==0.4.2
-pycparser==2.23
-PyJWT==2.10.1
-pyOpenSSL==25.1.0
-python-dateutil==2.9.0.post0
-pytz==2025.2
-PyYAML==6.0.2
-requests==2.32.5
-sentry-sdk==2.37.1
-service-identity==24.2.0
-six==1.17.0
-SQLAlchemy==2.0.43
-tomli==2.2.1
-treq==25.5.0
-Twisted==25.5.0
-txaio==23.6.1
-typing_extensions==4.15.0
-unidiff==0.7.5
-urllib3==2.5.0
-Werkzeug==3.1.3
-zipp==3.23.0
-zope.interface==7.2