diff --git a/pkgs/development/python-modules/astral/default.nix b/pkgs/development/python-modules/astral/default.nix
index c6831e4473cb..b51cee7083bb 100644
--- a/pkgs/development/python-modules/astral/default.nix
+++ b/pkgs/development/python-modules/astral/default.nix
@@ -7,9 +7,6 @@
   # build
   poetry-core,
 
-  # runtime
-  backports-zoneinfo,
-
   # tests
   pytestCheckHook,
   freezegun,
@@ -29,8 +26,6 @@ buildPythonPackage rec {
 
   nativeBuildInputs = [ poetry-core ];
 
-  propagatedBuildInputs = lib.optionals (pythonOlder "3.9") [ backports-zoneinfo ];
-
   nativeCheckInputs = [
     freezegun
     pytestCheckHook
diff --git a/pkgs/development/python-modules/backports-cached-property/default.nix b/pkgs/development/python-modules/backports-cached-property/default.nix
deleted file mode 100644
index c2a0bc245915..000000000000
--- a/pkgs/development/python-modules/backports-cached-property/default.nix
+++ /dev/null
@@ -1,45 +0,0 @@
-{
-  lib,
-  buildPythonPackage,
-  fetchFromGitHub,
-  pythonOlder,
-  setuptools-scm,
-  wheel,
-  pytestCheckHook,
-  pytest-mock,
-  pytest-sugar,
-}:
-
-buildPythonPackage rec {
-  pname = "backports-cached-property";
-  version = "1.0.2";
-  format = "pyproject";
-
-  disabled = pythonOlder "3.8";
-
-  src = fetchFromGitHub {
-    owner = "penguinolog";
-    repo = "backports.cached_property";
-    rev = version;
-    hash = "sha256-rdgKbVQaELilPrN4ve8RbbaLiT14Xex0esy5vUX2ZBc=";
-  };
-
-  nativeBuildInputs = [ setuptools-scm ];
-
-  propagatedBuildInputs = [ wheel ];
-
-  nativeCheckInputs = [
-    pytestCheckHook
-    pytest-mock
-    pytest-sugar
-  ];
-
-  pythonImportsCheck = [ "backports.cached_property" ];
-
-  meta = with lib; {
-    description = "Python 3.8 functools.cached_property backport to python 3.6";
-    homepage = "https://github.com/penguinolog/backports.cached_property";
-    license = with licenses; [ mit ];
-    maintainers = with maintainers; [ izorkin ];
-  };
-}
diff --git a/pkgs/development/python-modules/backports-shutil-get-terminal-size/default.nix b/pkgs/development/python-modules/backports-shutil-get-terminal-size/default.nix
deleted file mode 100644
index b70f3acaaea9..000000000000
--- a/pkgs/development/python-modules/backports-shutil-get-terminal-size/default.nix
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-  lib,
-  buildPythonPackage,
-  fetchFromGitHub,
-  pytest,
-  pythonOlder,
-}:
-
-if !(pythonOlder "3.3") then
-  null
-else
-  buildPythonPackage {
-    pname = "backports-shutil-get-terminal-size";
-    version = "unstable-2016-02-21";
-
-    # there have been numerous fixes committed since the initial release.
-    # Most notably fixing a problem where the backport would always return
-    # terminal size 0. See https://trac.sagemath.org/ticket/25320#comment:5.
-    # Unfortunately the maintainer seems inactive and has not responded to
-    # a request for a new release since 2016:
-    # https://github.com/chrippa/backports.shutil_get_terminal_size/issues/7
-    src = fetchFromGitHub {
-      owner = "chrippa";
-      repo = "backports.shutil_get_terminal_size";
-      rev = "159e269450dbf37c3a837f6ea7e628d59acbb96a";
-      sha256 = "17sgv8vg0xxfdnca45l1mmwwvj29gich5c8kqznnj51kfccch7sg";
-    };
-
-    nativeCheckInputs = [ pytest ];
-
-    meta = with lib; {
-      description = "Backport of the get_terminal_size function from Python 3.3’s shutil";
-      homepage = "https://github.com/chrippa/backports.shutil_get_terminal_size";
-      license = with licenses; [ mit ];
-      maintainers = teams.sage.members;
-    };
-  }
diff --git a/pkgs/development/python-modules/backports-shutil-which/default.nix b/pkgs/development/python-modules/backports-shutil-which/default.nix
deleted file mode 100644
index 07335b5bf6b1..000000000000
--- a/pkgs/development/python-modules/backports-shutil-which/default.nix
+++ /dev/null
@@ -1,30 +0,0 @@
-{
-  lib,
-  fetchPypi,
-  buildPythonPackage,
-  pytest,
-}:
-
-buildPythonPackage rec {
-  pname = "backports-shutil-which";
-  version = "3.5.2";
-
-  src = fetchPypi {
-    pname = "backports.shutil_which";
-    inherit version;
-    sha256 = "fe39f567cbe4fad89e8ac4dbeb23f87ef80f7fe8e829669d0221ecdb0437c133";
-  };
-
-  nativeCheckInputs = [ pytest ];
-
-  checkPhase = ''
-    py.test test
-  '';
-
-  meta = with lib; {
-    description = "Backport of shutil.which from Python 3.3";
-    homepage = "https://github.com/minrk/backports.shutil_which";
-    license = licenses.psfl;
-    maintainers = with maintainers; [ jluttine ];
-  };
-}
diff --git a/pkgs/development/python-modules/backports-zoneinfo/default.nix b/pkgs/development/python-modules/backports-zoneinfo/default.nix
deleted file mode 100644
index 8dbefd22d281..000000000000
--- a/pkgs/development/python-modules/backports-zoneinfo/default.nix
+++ /dev/null
@@ -1,80 +0,0 @@
-{
-  lib,
-  buildPythonPackage,
-  fetchFromGitHub,
-  pythonAtLeast,
-  pythonOlder,
-  python,
-  substituteAll,
-  importlib-resources,
-  tzdata,
-  hypothesis,
-  pytestCheckHook,
-  fetchpatch,
-}:
-
-buildPythonPackage rec {
-  pname = "backports-zoneinfo";
-  version = "0.2.1";
-  format = "setuptools";
-
-  disabled = pythonAtLeast "3.9";
-
-  src = fetchFromGitHub {
-    owner = "pganssle";
-    repo = "zoneinfo";
-    rev = version;
-    hash = "sha256-00xdDOVdDanfsjQTd3yjMN2RFGel4cWRrAA3CvSnl24=";
-  };
-
-  # Make sure test data update patch applies
-  prePatch = ''
-    substituteInPlace tests/data/zoneinfo_data.json --replace \"2020a\" \"2021a\"
-  '';
-
-  patches = [
-    # Update test suite's test data to zoneinfo 2022a
-    # https://github.com/pganssle/zoneinfo/pull/115
-    (fetchpatch {
-      name = "backports-zoneinfo-2022a-update-test-data1.patch";
-      url = "https://github.com/pganssle/zoneinfo/pull/115/commits/837e2a0f9f1a1332e4233f83e3648fa564a9ec9e.patch";
-      sha256 = "196knwa212mr0b7zsh8papzr3f5mii87gcjjjx1r9zzvmk3g3ri0";
-    })
-    (fetchpatch {
-      name = "backports-zoneinfo-2022a-update-test-data2.patch";
-      url = "https://github.com/pganssle/zoneinfo/pull/115/commits/9fd330265b177916d6182249439bb40d5691eb58.patch";
-      sha256 = "1zxa5bkwi8hbnh4c0qv72wv6vdp5jlxqizfjsc05ymzvwa99cf75";
-    })
-
-    (substituteAll {
-      name = "zoneinfo-path";
-      src = ./zoneinfo.patch;
-      zoneinfo = "${tzdata}/${python.sitePackages}/tzdata/zoneinfo";
-    })
-  ];
-
-  propagatedBuildInputs = [ tzdata ] ++ lib.optionals (pythonOlder "3.7") [ importlib-resources ];
-
-  pythonImportsCheck = [ "backports.zoneinfo" ];
-
-  nativeCheckInputs = [
-    hypothesis
-    pytestCheckHook
-  ];
-
-  disabledTests = [
-    # AssertionError: 'AEDT' != 'AEST'
-    "test_folds_and_gaps"
-    # AssertionError: 0 != 1 : (datetime.datetime(1917, 3, 25, 2, 0, 1, tzinfo=backports.zoneinfo.ZoneInfo(key='Australia/Sydney')), datetime.datetime(1917, 3, 24, 15, 0, tzinfo=datetime.timezone.utc))
-    "test_folds_from_utc"
-    # backports.zoneinfo._common.ZoneInfoNotFoundError: 'No time zone found with key Eurasia/Badzone'
-    "test_bad_keys"
-  ];
-
-  meta = with lib; {
-    description = "Backport of the standard library module zoneinfo";
-    homepage = "https://github.com/pganssle/zoneinfo";
-    license = licenses.asl20;
-    maintainers = [ ];
-  };
-}
diff --git a/pkgs/development/python-modules/backports-zoneinfo/zoneinfo.patch b/pkgs/development/python-modules/backports-zoneinfo/zoneinfo.patch
deleted file mode 100644
index 69dd75030ab2..000000000000
--- a/pkgs/development/python-modules/backports-zoneinfo/zoneinfo.patch
+++ /dev/null
@@ -1,17 +0,0 @@
-diff --git a/src/backports/zoneinfo/_tzpath.py b/src/backports/zoneinfo/_tzpath.py
-index 9baaf6b..3f842af 100644
---- a/src/backports/zoneinfo/_tzpath.py
-+++ b/src/backports/zoneinfo/_tzpath.py
-@@ -24,10 +24,7 @@ def reset_tzpath(to=None):
-             base_tzpath = _parse_python_tzpath(env_var)
-         elif sys.platform != "win32":
-             base_tzpath = [
--                "/usr/share/zoneinfo",
--                "/usr/lib/zoneinfo",
--                "/usr/share/lib/zoneinfo",
--                "/etc/zoneinfo",
-+                "@zoneinfo@"
-             ]
- 
-             base_tzpath.sort(key=lambda x: not os.path.exists(x))
-
diff --git a/pkgs/development/python-modules/curtsies/default.nix b/pkgs/development/python-modules/curtsies/default.nix
index 7be20c559019..b979610a7411 100644
--- a/pkgs/development/python-modules/curtsies/default.nix
+++ b/pkgs/development/python-modules/curtsies/default.nix
@@ -1,7 +1,6 @@
 {
   lib,
   stdenv,
-  backports-cached-property,
   blessed,
   buildPythonPackage,
   cwcwidth,
@@ -29,7 +28,7 @@ buildPythonPackage rec {
   propagatedBuildInputs = [
     blessed
     cwcwidth
-  ] ++ lib.optionals (pythonOlder "3.8") [ backports-cached-property ];
+  ];
 
   nativeCheckInputs = [
     pyte
diff --git a/pkgs/development/python-modules/icalendar/default.nix b/pkgs/development/python-modules/icalendar/default.nix
index fb88bcfebc84..4c6d6da0e88e 100644
--- a/pkgs/development/python-modules/icalendar/default.nix
+++ b/pkgs/development/python-modules/icalendar/default.nix
@@ -3,10 +3,8 @@
   buildPythonPackage,
   fetchFromGitHub,
   replaceVars,
-  pythonOlder,
   hatch-vcs,
   hatchling,
-  backports-zoneinfo,
   python-dateutil,
   tzdata,
   hypothesis,
@@ -39,7 +37,7 @@ buildPythonPackage rec {
   dependencies = [
     python-dateutil
     tzdata
-  ] ++ lib.optionals (pythonOlder "3.9") [ backports-zoneinfo ];
+  ];
 
   nativeCheckInputs = [
     hypothesis
diff --git a/pkgs/development/python-modules/kombu/default.nix b/pkgs/development/python-modules/kombu/default.nix
index 1d04da99d071..c0cbb4a981d0 100644
--- a/pkgs/development/python-modules/kombu/default.nix
+++ b/pkgs/development/python-modules/kombu/default.nix
@@ -4,7 +4,6 @@
   azure-identity,
   azure-servicebus,
   azure-storage-queue,
-  backports-zoneinfo,
   boto3,
   buildPythonPackage,
   confluent-kafka,
diff --git a/pkgs/development/python-modules/libagent/default.nix b/pkgs/development/python-modules/libagent/default.nix
index 3422ae2ced2d..15d3cefb88ca 100644
--- a/pkgs/development/python-modules/libagent/default.nix
+++ b/pkgs/development/python-modules/libagent/default.nix
@@ -13,7 +13,6 @@
   unidecode,
   mock,
   pytestCheckHook,
-  backports-shutil-which,
   configargparse,
   python-daemon,
   pymsgbox,
@@ -43,9 +42,11 @@ buildPythonPackage rec {
 
   build-system = [ setuptools ];
 
+  # https://github.com/romanz/trezor-agent/pull/481
+  pythonRemoveDeps = [ "backports.shutil-which" ];
+
   dependencies = [
     unidecode
-    backports-shutil-which
     configargparse
     python-daemon
     pymsgbox
diff --git a/pkgs/development/python-modules/pelican/default.nix b/pkgs/development/python-modules/pelican/default.nix
index 0472bf106c50..b6b03a7714ea 100644
--- a/pkgs/development/python-modules/pelican/default.nix
+++ b/pkgs/development/python-modules/pelican/default.nix
@@ -14,7 +14,6 @@
   typogrify,
 
   # dependencies
-  backports-zoneinfo,
   blinker,
   docutils,
   feedgenerator,
diff --git a/pkgs/development/python-modules/pendulum/default.nix b/pkgs/development/python-modules/pendulum/default.nix
index bd74e66c6915..cd49841eecad 100644
--- a/pkgs/development/python-modules/pendulum/default.nix
+++ b/pkgs/development/python-modules/pendulum/default.nix
@@ -14,7 +14,6 @@
   iconv,
 
   # dependencies
-  backports-zoneinfo,
   importlib-resources,
   python-dateutil,
   time-machine,
@@ -69,7 +68,6 @@ buildPythonPackage rec {
     ]
     ++ lib.optional (!isPyPy) [ time-machine ]
     ++ lib.optionals (pythonOlder "3.9") [
-      backports-zoneinfo
       importlib-resources
     ];
 
diff --git a/pkgs/development/python-modules/psycopg/default.nix b/pkgs/development/python-modules/psycopg/default.nix
index 3338ad86ce2e..7cba53cb3ec0 100644
--- a/pkgs/development/python-modules/psycopg/default.nix
+++ b/pkgs/development/python-modules/psycopg/default.nix
@@ -12,7 +12,6 @@
   setuptools,
 
   # propagates
-  backports-zoneinfo,
   typing-extensions,
 
   # psycopg-c
@@ -153,7 +152,7 @@ buildPythonPackage rec {
   propagatedBuildInputs = [
     psycopg-c
     typing-extensions
-  ] ++ lib.optionals (pythonOlder "3.9") [ backports-zoneinfo ];
+  ];
 
   pythonImportsCheck = [
     "psycopg"
diff --git a/pkgs/development/python-modules/pytz-deprecation-shim/default.nix b/pkgs/development/python-modules/pytz-deprecation-shim/default.nix
index ef40519c544a..6725091b76c5 100644
--- a/pkgs/development/python-modules/pytz-deprecation-shim/default.nix
+++ b/pkgs/development/python-modules/pytz-deprecation-shim/default.nix
@@ -4,7 +4,6 @@
   fetchPypi,
   pythonAtLeast,
   pythonOlder,
-  backports-zoneinfo,
   python-dateutil,
   setuptools,
   tzdata,
@@ -28,8 +27,7 @@ buildPythonPackage rec {
   nativeBuildInputs = [ setuptools ];
 
   propagatedBuildInputs =
-    (lib.optionals (pythonAtLeast "3.6" && pythonOlder "3.9") [ backports-zoneinfo ])
-    ++ (lib.optionals (pythonOlder "3.6") [ python-dateutil ])
+    (lib.optionals (pythonOlder "3.6") [ python-dateutil ])
     ++ (lib.optionals (pythonAtLeast "3.6") [ tzdata ]);
 
   nativeCheckInputs = [
diff --git a/pkgs/development/python-modules/urllib3/default.nix b/pkgs/development/python-modules/urllib3/default.nix
index 943bed05fb02..7350e3ffa74e 100644
--- a/pkgs/development/python-modules/urllib3/default.nix
+++ b/pkgs/development/python-modules/urllib3/default.nix
@@ -14,10 +14,8 @@
   pysocks,
 
   # tests
-  backports-zoneinfo,
   pytestCheckHook,
   pytest-timeout,
-  pythonOlder,
   tornado,
   trustme,
 }:
@@ -43,15 +41,12 @@ let
       socks = [ pysocks ];
     };
 
-    nativeCheckInputs =
-      [
-        pytest-timeout
-        pytestCheckHook
-        tornado
-        trustme
-      ]
-      ++ lib.optionals (pythonOlder "3.9") [ backports-zoneinfo ]
-      ++ lib.flatten (builtins.attrValues optional-dependencies);
+    nativeCheckInputs = [
+      pytest-timeout
+      pytestCheckHook
+      tornado
+      trustme
+    ] ++ lib.flatten (builtins.attrValues optional-dependencies);
 
     # Tests in urllib3 are mostly timeout-based instead of event-based and
     # are therefore inherently flaky. On your own machine, the tests will
diff --git a/pkgs/servers/home-assistant/default.nix b/pkgs/servers/home-assistant/default.nix
index c754cb34576f..d373e2528b40 100644
--- a/pkgs/servers/home-assistant/default.nix
+++ b/pkgs/servers/home-assistant/default.nix
@@ -95,7 +95,7 @@ let
             --replace-fail "poetry>=1.0.0b1" "poetry-core" \
             --replace-fail "poetry.masonry" "poetry.core.masonry"
         '';
-        propagatedBuildInputs = oldAttrs.propagatedBuildInputs ++ [
+        propagatedBuildInputs = (oldAttrs.propagatedBuildInputs or []) ++ [
           self.pytz
         ];
       });
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index 8602eeca2980..27a73c44ae36 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -68,6 +68,10 @@ mapAliases ({
   awkward0 = throw "awkward0 has been removed, use awkward instead"; # added 2022-12-13
   azure-functions-devops-build = throw "azure-functions-devops-build has been removed, because it is abandoned"; # added 2024-10-04
   Babel = babel; # added 2022-05-06
+  backports-cached-property = throw "backports-cached-property has been removed, since we no longer need to backport to python3.7"; # added 2024-11-12
+  backports-shutil-get-terminal-size = throw "backports-shutil-get-terminal-size has been removed, since we no longer need to backport to python3.2"; # added 2024-11-12
+  backports-shutil-which = throw "backports-shutil-which has been removed, since we no longer need to backport to python3.2"; # added 2024-11-12
+  backports-zoneinfo = throw "backports-zoneinfo has been removed, since we no longer need to backport to python3.8"; # added 2024-11-12
   backports_csv = throw "backports_csv has been removed, since we no longer need to backport to python2"; # added 2023-07-28
   backports_functools_lru_cache = throw "backports_functools_lru_cache has been removed, since we no longer need to backport to python3.2"; # added 2023-07-28
   backports_shutil_get_terminal_size = backports-shutil-get-terminal-size; # added 2024-04-21
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 05eb314e06b1..62f9ae46754d 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1436,22 +1436,14 @@ self: super: with self; {
 
   backoff = callPackage ../development/python-modules/backoff { };
 
-  backports-cached-property = callPackage ../development/python-modules/backports-cached-property { };
-
   backports-datetime-fromisoformat = callPackage ../development/python-modules/backports-datetime-fromisoformat { };
 
   backports-entry-points-selectable = callPackage ../development/python-modules/backports-entry-points-selectable { };
 
-  backports-shutil-get-terminal-size = callPackage ../development/python-modules/backports-shutil-get-terminal-size { };
-
-  backports-shutil-which = callPackage ../development/python-modules/backports-shutil-which { };
-
   backports-strenum = callPackage ../development/python-modules/backports-strenum { };
 
   backports-tarfile = callPackage ../development/python-modules/backports-tarfile { };
 
-  backports-zoneinfo = callPackage ../development/python-modules/backports-zoneinfo { };
-
   bacpypes = callPackage ../development/python-modules/bacpypes { };
 
   bagit = callPackage ../development/python-modules/bagit { };