diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 77754fc021..7f466d4f0a 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 60.8.1
+current_version = 60.8.2
 commit = True
 tag = True
 
diff --git a/.github/workflows/ci-sage.yml b/.github/workflows/ci-sage.yml
index 573b269b3b..b802a58c79 100644
--- a/.github/workflows/ci-sage.yml
+++ b/.github/workflows/ci-sage.yml
@@ -7,7 +7,7 @@ name: Run Sage CI for Linux
 ##  - continuous integration, by building and testing other software
 ##    that depends on this project.
 ##
-## It runs on every pull request and push of a tag to the GitHub repository.
+## It runs on every push of a tag to the GitHub repository.
 ##
 ## The testing can be monitored in the "Actions" tab of the GitHub repository.
 ##
@@ -33,11 +33,7 @@ name: Run Sage CI for Linux
 ## Many copies of the second step are run in parallel for each of the tested
 ## systems/configurations.
 
-#on: [push, pull_request]
-
 on:
-  pull_request:
-    types: [opened, synchronize]
   push:
     tags:
       - '*'
diff --git a/CHANGES.rst b/CHANGES.rst
index 0183241bb7..cd46ace6a0 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,15 @@
+v60.8.2
+-------
+
+
+Misc
+^^^^
+* #3091: Make ``concurrent.futures`` import lazy in vendored ``more_itertools``
+  package to a  avoid importing threading as a side effect (which caused
+  `gevent/gevent#1865 <https://github.com/gevent/gevent/issues/1865>`__).
+  -- by :user:`maciejp-ro`
+
+
 v60.8.1
 -------
 
diff --git a/bootstrap.py b/bootstrap.py
deleted file mode 100644
index 229b996503..0000000000
--- a/bootstrap.py
+++ /dev/null
@@ -1,7 +0,0 @@
-import warnings
-
-
-msg = "bootstrap.py is no longer needed. Use a PEP-517-compatible builder instead."
-
-
-__name__ == '__main__' and warnings.warn(msg)
diff --git a/pkg_resources/_vendor/more_itertools/more.py b/pkg_resources/_vendor/more_itertools/more.py
index 630af973f2..6b6a5cab25 100644
--- a/pkg_resources/_vendor/more_itertools/more.py
+++ b/pkg_resources/_vendor/more_itertools/more.py
@@ -2,7 +2,6 @@
 
 from collections import Counter, defaultdict, deque, abc
 from collections.abc import Sequence
-from concurrent.futures import ThreadPoolExecutor
 from functools import partial, reduce, wraps
 from heapq import merge, heapify, heapreplace, heappop
 from itertools import (
@@ -3656,7 +3655,7 @@ def __init__(self, func, callback_kwd='callback', wait_seconds=0.1):
         self._aborted = False
         self._future = None
         self._wait_seconds = wait_seconds
-        self._executor = ThreadPoolExecutor(max_workers=1)
+        self._executor = __import__("concurrent.futures").futures.ThreadPoolExecutor(max_workers=1)
         self._iterator = self._reader()
 
     def __enter__(self):
diff --git a/setup.cfg b/setup.cfg
index d6f08caa50..24eda5a36c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = setuptools
-version = 60.8.1
+version = 60.8.2
 author = Python Packaging Authority
 author_email = distutils-sig@python.org
 description = Easily download, build, install, upgrade, and uninstall Python packages
diff --git a/setuptools/_vendor/more_itertools/more.py b/setuptools/_vendor/more_itertools/more.py
index 0f7d282aa5..e6fca4d47f 100644
--- a/setuptools/_vendor/more_itertools/more.py
+++ b/setuptools/_vendor/more_itertools/more.py
@@ -2,7 +2,6 @@
 
 from collections import Counter, defaultdict, deque, abc
 from collections.abc import Sequence
-from concurrent.futures import ThreadPoolExecutor
 from functools import partial, reduce, wraps
 from heapq import merge, heapify, heapreplace, heappop
 from itertools import (
@@ -3454,7 +3453,7 @@ def __init__(self, func, callback_kwd='callback', wait_seconds=0.1):
         self._aborted = False
         self._future = None
         self._wait_seconds = wait_seconds
-        self._executor = ThreadPoolExecutor(max_workers=1)
+        self._executor = __import__("concurrent.futures").futures.ThreadPoolExecutor(max_workers=1)
         self._iterator = self._reader()
 
     def __enter__(self):
diff --git a/tools/vendored.py b/tools/vendored.py
index 7447890237..8a122ad778 100644
--- a/tools/vendored.py
+++ b/tools/vendored.py
@@ -74,6 +74,21 @@ def rewrite_importlib_metadata(pkg_files, new_root):
         file.write_text(text)
 
 
+def rewrite_more_itertools(pkg_files: Path):
+    """
+    Defer import of concurrent.futures. Workaround for #3090.
+    """
+    more_file = pkg_files.joinpath('more.py')
+    text = more_file.read_text()
+    text = re.sub(r'^.*concurrent.futures.*?\n', '', text, flags=re.MULTILINE)
+    text = re.sub(
+        'ThreadPoolExecutor',
+        '__import__("concurrent.futures").futures.ThreadPoolExecutor',
+        text,
+    )
+    more_file.write_text(text)
+
+
 def clean(vendor):
     """
     Remove all files out of the vendor directory except the meta
@@ -106,6 +121,7 @@ def update_pkg_resources():
     rewrite_jaraco_text(vendor / 'jaraco/text', 'pkg_resources.extern')
     rewrite_jaraco(vendor / 'jaraco', 'pkg_resources.extern')
     rewrite_importlib_resources(vendor / 'importlib_resources', 'pkg_resources.extern')
+    rewrite_more_itertools(vendor / "more_itertools")
 
 
 def update_setuptools():
@@ -116,6 +132,7 @@ def update_setuptools():
     rewrite_jaraco(vendor / 'jaraco', 'setuptools.extern')
     rewrite_importlib_resources(vendor / 'importlib_resources', 'setuptools.extern')
     rewrite_importlib_metadata(vendor / 'importlib_metadata', 'setuptools.extern')
+    rewrite_more_itertools(vendor / "more_itertools")
 
 
 __name__ == '__main__' and update_vendored()