diff --git a/.travis.yml b/.travis.yml
index 03b502c80..750f93f81 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -86,6 +86,9 @@ jobs:
     - env: TOXENV=py36-xdist
       python: '3.6'
     - env: TOXENV=linting,docs,doctesting PYTEST_COVERAGE=1
+      cache:
+        directories:
+          - $HOME/.cache/pre-commit
 
     - stage: deploy
       python: '3.6'
@@ -144,7 +147,4 @@ notifications:
     skip_join: true
   email:
     - pytest-commit@python.org
-cache:
-    directories:
-        - $HOME/.cache/pip
-        - $HOME/.cache/pre-commit
+cache: false
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 9f98f6408..839b4c439 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -18,6 +18,28 @@ with advance notice in the **Deprecations** section of releases.
 
 .. towncrier release notes start
 
+pytest 4.3.1 (2019-03-11)
+=========================
+
+Bug Fixes
+---------
+
+- `#4810 <https://github.com/pytest-dev/pytest/issues/4810>`_: Logging messages inside ``pytest_runtest_logreport()`` are now properly captured and displayed.
+
+
+- `#4861 <https://github.com/pytest-dev/pytest/issues/4861>`_: Improve validation of contents written to captured output so it behaves the same as when capture is disabled.
+
+
+- `#4898 <https://github.com/pytest-dev/pytest/issues/4898>`_: Fix ``AttributeError: FixtureRequest has no 'confg' attribute`` bug in ``testdir.copy_example``.
+
+
+
+Trivial/Internal Changes
+------------------------
+
+- `#4768 <https://github.com/pytest-dev/pytest/issues/4768>`_: Avoid pkg_resources import at the top-level.
+
+
 pytest 4.3.0 (2019-02-16)
 =========================
 
diff --git a/changelog/4810.bugfix.rst b/changelog/4810.bugfix.rst
deleted file mode 100644
index 32d9b97a5..000000000
--- a/changelog/4810.bugfix.rst
+++ /dev/null
@@ -1 +0,0 @@
-Logging messages inside ``pytest_runtest_logreport()`` are now properly captured and displayed.
diff --git a/changelog/4861.bugfix.rst b/changelog/4861.bugfix.rst
deleted file mode 100644
index b4bf125d1..000000000
--- a/changelog/4861.bugfix.rst
+++ /dev/null
@@ -1 +0,0 @@
-Improve validation of contents written to captured output so it behaves the same as when capture is disabled.
diff --git a/changelog/4903.bugfix.rst b/changelog/4903.bugfix.rst
new file mode 100644
index 000000000..116e1b0fd
--- /dev/null
+++ b/changelog/4903.bugfix.rst
@@ -0,0 +1 @@
+Use the correct modified time for years after 2038 in rewritten ``.pyc`` files.
diff --git a/changelog/4912.trivial.rst b/changelog/4912.trivial.rst
new file mode 100644
index 000000000..9c5ca6d8e
--- /dev/null
+++ b/changelog/4912.trivial.rst
@@ -0,0 +1 @@
+Remove deprecated Sphinx directive, ``add_description_unit()``.
diff --git a/changelog/4913.trivial.rst b/changelog/4913.trivial.rst
new file mode 100644
index 000000000..7846775cc
--- /dev/null
+++ b/changelog/4913.trivial.rst
@@ -0,0 +1 @@
+Fix pytest tests invocation with custom ``PYTHONPATH``.
diff --git a/doc/en/announce/index.rst b/doc/en/announce/index.rst
index 9574229d0..96123f3fb 100644
--- a/doc/en/announce/index.rst
+++ b/doc/en/announce/index.rst
@@ -6,6 +6,7 @@ Release announcements
    :maxdepth: 2
 
 
+   release-4.3.1
    release-4.3.0
    release-4.2.1
    release-4.2.0
diff --git a/doc/en/announce/release-4.3.1.rst b/doc/en/announce/release-4.3.1.rst
new file mode 100644
index 000000000..45d14fffe
--- /dev/null
+++ b/doc/en/announce/release-4.3.1.rst
@@ -0,0 +1,29 @@
+pytest-4.3.1
+=======================================
+
+pytest 4.3.1 has just been released to PyPI.
+
+This is a bug-fix release, being a drop-in replacement. To upgrade::
+
+  pip install --upgrade pytest
+
+The full changelog is available at https://docs.pytest.org/en/latest/changelog.html.
+
+Thanks to all who contributed to this release, among them:
+
+* Andras Mitzki
+* Anthony Sottile
+* Bruno Oliveira
+* Daniel Hahler
+* Danilo Horta
+* Grygorii Iermolenko
+* Jeff Hale
+* Kyle Altendorf
+* Stephan Hoyer
+* Zac Hatfield-Dodds
+* Zac-HD
+* songbowen
+
+
+Happy testing,
+The pytest Development Team
diff --git a/doc/en/conf.py b/doc/en/conf.py
index 74a43596e..5daa15a06 100644
--- a/doc/en/conf.py
+++ b/doc/en/conf.py
@@ -335,7 +335,7 @@ intersphinx_mapping = {"python": ("https://docs.python.org/3", None)}
 def setup(app):
     # from sphinx.ext.autodoc import cut_lines
     # app.connect('autodoc-process-docstring', cut_lines(4, what=['module']))
-    app.add_description_unit(
+    app.add_object_type(
         "confval",
         "confval",
         objname="configuration value",
diff --git a/doc/en/example/parametrize.rst b/doc/en/example/parametrize.rst
index 05932d164..b5d4693ad 100644
--- a/doc/en/example/parametrize.rst
+++ b/doc/en/example/parametrize.rst
@@ -436,8 +436,10 @@ Running it results in some skips if we don't have all the python interpreters in
 .. code-block:: pytest
 
    . $ pytest -rs -q multipython.py
-   ...........................                                          [100%]
-   27 passed in 0.12 seconds
+   ...sss...sssssssss...sss...                                          [100%]
+   ========================= short test summary info ==========================
+   SKIPPED [15] $REGENDOC_TMPDIR/CWD/multipython.py:30: 'python3.4' not found
+   12 passed, 15 skipped in 0.12 seconds
 
 Indirect parametrization of optional implementations/imports
 --------------------------------------------------------------------
diff --git a/doc/en/reference.rst b/doc/en/reference.rst
index 7ab734075..ca1061a8f 100644
--- a/doc/en/reference.rst
+++ b/doc/en/reference.rst
@@ -584,6 +584,8 @@ Initialization hooks called for plugins and ``conftest.py`` files.
 .. autofunction:: pytest_sessionstart
 .. autofunction:: pytest_sessionfinish
 
+.. autofunction:: pytest_plugin_registered
+
 Test running hooks
 ~~~~~~~~~~~~~~~~~~
 
@@ -607,6 +609,8 @@ into interactive debugging when a test failure occurs.
 The :py:mod:`_pytest.terminal` reported specifically uses
 the reporting hook to print information about a test run.
 
+.. autofunction:: pytest_pyfunc_call
+
 Collection hooks
 ~~~~~~~~~~~~~~~~
 
@@ -616,6 +620,7 @@ Collection hooks
 .. autofunction:: pytest_ignore_collect
 .. autofunction:: pytest_collect_directory
 .. autofunction:: pytest_collect_file
+.. autofunction:: pytest_pycollect_makemodule
 
 For influencing the collection of objects in Python modules
 you can use the following hook:
@@ -629,12 +634,15 @@ items, delete or otherwise amend the test items:
 
 .. autofunction:: pytest_collection_modifyitems
 
+.. autofunction:: pytest_collection_finish
+
 Reporting hooks
 ~~~~~~~~~~~~~~~
 
 Session related reporting hooks:
 
 .. autofunction:: pytest_collectstart
+.. autofunction:: pytest_make_collect_report
 .. autofunction:: pytest_itemcollected
 .. autofunction:: pytest_collectreport
 .. autofunction:: pytest_deselected
diff --git a/doc/en/requirements.txt b/doc/en/requirements.txt
index 4e2b8ce1a..320ee8dcd 100644
--- a/doc/en/requirements.txt
+++ b/doc/en/requirements.txt
@@ -1,4 +1,4 @@
 pygments-pytest>=1.1.0
-sphinx>=1.8.2
+sphinx>=1.8.2,<2.0
 sphinxcontrib-trio
 sphinx-removed-in>=0.1.3
diff --git a/doc/en/tmpdir.rst b/doc/en/tmpdir.rst
index e2b8fc32b..f16b9260c 100644
--- a/doc/en/tmpdir.rst
+++ b/doc/en/tmpdir.rst
@@ -66,7 +66,6 @@ Running this would result in a passed test except for the last
     test_tmp_path.py:13: AssertionError
     ========================= 1 failed in 0.12 seconds =========================
 
-
 .. _`tmp_path_factory example`:
 
 The ``tmp_path_factory`` fixture
diff --git a/src/_pytest/assertion/rewrite.py b/src/_pytest/assertion/rewrite.py
index 19192c9d9..18506d2e1 100644
--- a/src/_pytest/assertion/rewrite.py
+++ b/src/_pytest/assertion/rewrite.py
@@ -347,9 +347,11 @@ def _write_pyc(state, co, source_stat, pyc):
     try:
         with atomicwrites.atomic_write(pyc, mode="wb", overwrite=True) as fp:
             fp.write(imp.get_magic())
-            mtime = int(source_stat.mtime)
+            # as of now, bytecode header expects 32-bit numbers for size and mtime (#4903)
+            mtime = int(source_stat.mtime) & 0xFFFFFFFF
             size = source_stat.size & 0xFFFFFFFF
-            fp.write(struct.pack("<ll", mtime, size))
+            # "<LL" stands for 2 unsigned longs, little-ending
+            fp.write(struct.pack("<LL", mtime, size))
             fp.write(marshal.dumps(co))
     except EnvironmentError as e:
         state.trace("error writing pyc file at %s: errno=%s" % (pyc, e.errno))
@@ -444,7 +446,7 @@ def _read_pyc(source, pyc, trace=lambda x: None):
         if (
             len(data) != 12
             or data[:4] != imp.get_magic()
-            or struct.unpack("<ll", data[4:]) != (mtime, size)
+            or struct.unpack("<LL", data[4:]) != (mtime & 0xFFFFFFFF, size & 0xFFFFFFFF)
         ):
             trace("_read_pyc(%s): invalid or out of date pyc" % source)
             return None
diff --git a/src/_pytest/config/__init__.py b/src/_pytest/config/__init__.py
index 1da72032b..22eeaa33d 100644
--- a/src/_pytest/config/__init__.py
+++ b/src/_pytest/config/__init__.py
@@ -14,7 +14,6 @@ import warnings
 
 import py
 import six
-from pkg_resources import parse_version
 from pluggy import HookimplMarker
 from pluggy import HookspecMarker
 from pluggy import PluginManager
@@ -853,6 +852,7 @@ class Config(object):
 
     def _checkversion(self):
         import pytest
+        from pkg_resources import parse_version
 
         minver = self.inicfg.get("minversion", None)
         if minver:
diff --git a/src/_pytest/pytester.py b/src/_pytest/pytester.py
index d667452d1..810041de7 100644
--- a/src/_pytest/pytester.py
+++ b/src/_pytest/pytester.py
@@ -652,7 +652,7 @@ class Testdir(object):
             else:
                 raise LookupError(
                     "{} cant be found as module or package in {}".format(
-                        func_name, example_dir.bestrelpath(self.request.confg.rootdir)
+                        func_name, example_dir.bestrelpath(self.request.config.rootdir)
                     )
                 )
         else:
diff --git a/src/_pytest/python.py b/src/_pytest/python.py
index e41acfecc..0b4fb9a24 100644
--- a/src/_pytest/python.py
+++ b/src/_pytest/python.py
@@ -238,25 +238,24 @@ class PyobjMixin(PyobjContext):
     def __init__(self, *k, **kw):
         super(PyobjMixin, self).__init__(*k, **kw)
 
-    def obj():
-        def fget(self):
-            obj = getattr(self, "_obj", None)
-            if obj is None:
-                self._obj = obj = self._getobj()
-                # XXX evil hack
-                # used to avoid Instance collector marker duplication
-                if self._ALLOW_MARKERS:
-                    self.own_markers.extend(get_unpacked_marks(self.obj))
-            return obj
+    @property
+    def obj(self):
+        """Underlying Python object."""
+        obj = getattr(self, "_obj", None)
+        if obj is None:
+            self._obj = obj = self._getobj()
+            # XXX evil hack
+            # used to avoid Instance collector marker duplication
+            if self._ALLOW_MARKERS:
+                self.own_markers.extend(get_unpacked_marks(self.obj))
+        return obj
 
-        def fset(self, value):
-            self._obj = value
-
-        return property(fget, fset, None, "underlying python object")
-
-    obj = obj()
+    @obj.setter
+    def obj(self, value):
+        self._obj = value
 
     def _getobj(self):
+        """Gets the underlying Python object. May be overwritten by subclasses."""
         return getattr(self.parent.obj, self.name)
 
     def getmodpath(self, stopatmodule=True, includemodule=False):
diff --git a/testing/test_assertrewrite.py b/testing/test_assertrewrite.py
index 098e106f9..bdfbf823c 100644
--- a/testing/test_assertrewrite.py
+++ b/testing/test_assertrewrite.py
@@ -1197,6 +1197,29 @@ class TestIssue2121:
         result.stdout.fnmatch_lines("*E*assert (1 + 1) == 3")
 
 
+@pytest.mark.parametrize("offset", [-1, +1])
+def test_source_mtime_long_long(testdir, offset):
+    """Support modification dates after 2038 in rewritten files (#4903).
+
+    pytest would crash with:
+
+            fp.write(struct.pack("<ll", mtime, size))
+        E   struct.error: argument out of range
+    """
+    p = testdir.makepyfile(
+        """
+        def test(): pass
+    """
+    )
+    # use unsigned long timestamp which overflows signed long,
+    # which was the cause of the bug
+    # +1 offset also tests masking of 0xFFFFFFFF
+    timestamp = 2 ** 32 + offset
+    os.utime(str(p), (timestamp, timestamp))
+    result = testdir.runpytest()
+    assert result.ret == 0
+
+
 def test_rewrite_infinite_recursion(testdir, pytestconfig, monkeypatch):
     """Fix infinite recursion when writing pyc files: if an import happens to be triggered when writing the pyc
     file, this would cause another call to the hook, which would trigger another pyc writing, which could
diff --git a/testing/test_collection.py b/testing/test_collection.py
index 97c46d8c2..37f7ad89c 100644
--- a/testing/test_collection.py
+++ b/testing/test_collection.py
@@ -2,6 +2,7 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
+import os
 import pprint
 import sys
 import textwrap
@@ -1108,7 +1109,7 @@ def test_collect_pyargs_with_testpaths(testdir, monkeypatch):
     """
         )
     )
-    monkeypatch.setenv("PYTHONPATH", str(testdir.tmpdir))
+    monkeypatch.setenv("PYTHONPATH", str(testdir.tmpdir), prepend=os.pathsep)
     with root.as_cwd():
         result = testdir.runpytest_subprocess()
     result.stdout.fnmatch_lines(["*1 passed in*"])
diff --git a/testing/test_pdb.py b/testing/test_pdb.py
index f9a050b10..5b62def2d 100644
--- a/testing/test_pdb.py
+++ b/testing/test_pdb.py
@@ -459,7 +459,7 @@ class TestPDB(object):
         child.read()
         self.flush(child)
 
-    def test_pdb_interaction_doctest(self, testdir):
+    def test_pdb_interaction_doctest(self, testdir, monkeypatch):
         p1 = testdir.makepyfile(
             """
             import pytest
@@ -470,11 +470,18 @@ class TestPDB(object):
                 '''
         """
         )
+        # Prevent ~/.pdbrc etc to output anything.
+        monkeypatch.setenv("HOME", str(testdir))
+
         child = testdir.spawn_pytest("--doctest-modules --pdb %s" % p1)
         child.expect("Pdb")
-        child.sendline("i")
-        child.expect("0")
+
+        assert "UNEXPECTED EXCEPTION: AssertionError()" in child.before.decode("utf8")
+
+        child.sendline("'i=%i.' % i")
         child.expect("Pdb")
+        assert "\r\n'i=0.'\r\n" in child.before.decode("utf8")
+
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -530,15 +537,13 @@ class TestPDB(object):
                     import sys
                     import types
 
-                    newglobals = {
-                        'Pdb': self.__class__,  # NOTE: different with pdb.Pdb
-                        'sys': sys,
-                    }
                     if sys.version_info < (3, ):
                         do_debug_func = pdb.Pdb.do_debug.im_func
                     else:
                         do_debug_func = pdb.Pdb.do_debug
 
+                    newglobals = do_debug_func.__globals__.copy()
+                    newglobals['Pdb'] = self.__class__
                     orig_do_debug = types.FunctionType(
                         do_debug_func.__code__, newglobals,
                         do_debug_func.__name__, do_debug_func.__defaults__,