diff --git a/hypothesis-python/RELEASE.rst b/hypothesis-python/RELEASE.rst
new file mode 100644
index 0000000000..aab3eb2b2a
--- /dev/null
+++ b/hypothesis-python/RELEASE.rst
@@ -0,0 +1,3 @@
+RELEASE_TYPE: patch
+
+This is a formatting-only patch, enabled by a new version of :pypi:`isort`.
diff --git a/hypothesis-python/src/hypothesis/__init__.py b/hypothesis-python/src/hypothesis/__init__.py
index 6d172ba706..c3beab0080 100644
--- a/hypothesis-python/src/hypothesis/__init__.py
+++ b/hypothesis-python/src/hypothesis/__init__.py
@@ -22,14 +22,14 @@
 failing examples it finds.
 """
 
+from __future__ import absolute_import, division, print_function
 
-from hypothesis._settings import settings, Verbosity, Phase, HealthCheck, unlimited
-from hypothesis.version import __version_info__, __version__
-from hypothesis.control import assume, note, reject, event
-from hypothesis.core import given, find, example, seed, reproduce_failure, PrintSettings
+from hypothesis._settings import HealthCheck, Phase, Verbosity, settings, unlimited
+from hypothesis.control import assume, event, note, reject
+from hypothesis.core import PrintSettings, example, find, given, reproduce_failure, seed
 from hypothesis.internal.entropy import register_random
 from hypothesis.utils.conventions import infer
-
+from hypothesis.version import __version__, __version_info__
 
 __all__ = [
     "settings",
diff --git a/hypothesis-python/src/hypothesis/extra/__init__.py b/hypothesis-python/src/hypothesis/extra/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/src/hypothesis/extra/__init__.py
+++ b/hypothesis-python/src/hypothesis/extra/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/src/hypothesis/extra/django/__init__.py b/hypothesis-python/src/hypothesis/extra/django/__init__.py
index 203b881a9f..2c5b922c80 100644
--- a/hypothesis-python/src/hypothesis/extra/django/__init__.py
+++ b/hypothesis-python/src/hypothesis/extra/django/__init__.py
@@ -15,12 +15,14 @@
 #
 # END HEADER
 
+from __future__ import absolute_import, division, print_function
+
 from hypothesis.extra.django._fields import from_field, register_field_strategy
 from hypothesis.extra.django._impl import (
     TestCase,
     TransactionTestCase,
-    from_model,
     from_form,
+    from_model,
 )
 
 __all__ = [
diff --git a/hypothesis-python/src/hypothesis/extra/pandas/__init__.py b/hypothesis-python/src/hypothesis/extra/pandas/__init__.py
index c8d4166b7f..7224c5bf86 100644
--- a/hypothesis-python/src/hypothesis/extra/pandas/__init__.py
+++ b/hypothesis-python/src/hypothesis/extra/pandas/__init__.py
@@ -15,15 +15,15 @@
 #
 # END HEADER
 
-from __future__ import division, print_function, absolute_import
+from __future__ import absolute_import, division, print_function
 
 from hypothesis.extra.pandas.impl import (
-    series,
-    data_frames,
     column,
     columns,
+    data_frames,
     indexes,
     range_indexes,
+    series,
 )
 
 __all__ = ["indexes", "range_indexes", "series", "column", "columns", "data_frames"]
diff --git a/hypothesis-python/src/hypothesis/internal/__init__.py b/hypothesis-python/src/hypothesis/internal/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/src/hypothesis/internal/__init__.py
+++ b/hypothesis-python/src/hypothesis/internal/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/src/hypothesis/internal/conjecture/__init__.py b/hypothesis-python/src/hypothesis/internal/conjecture/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/src/hypothesis/internal/conjecture/__init__.py
+++ b/hypothesis-python/src/hypothesis/internal/conjecture/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/src/hypothesis/internal/conjecture/shrinking/__init__.py b/hypothesis-python/src/hypothesis/internal/conjecture/shrinking/__init__.py
index 073d50488c..5f987c4eff 100644
--- a/hypothesis-python/src/hypothesis/internal/conjecture/shrinking/__init__.py
+++ b/hypothesis-python/src/hypothesis/internal/conjecture/shrinking/__init__.py
@@ -15,10 +15,11 @@
 #
 # END HEADER
 
+from __future__ import absolute_import, division, print_function
+
+from hypothesis.internal.conjecture.shrinking.floats import Float
 from hypothesis.internal.conjecture.shrinking.integer import Integer
 from hypothesis.internal.conjecture.shrinking.lexical import Lexical
 from hypothesis.internal.conjecture.shrinking.ordering import Ordering
-from hypothesis.internal.conjecture.shrinking.floats import Float
-
 
 __all__ = ["Lexical", "Integer", "Ordering", "Float"]
diff --git a/hypothesis-python/src/hypothesis/searchstrategy/__init__.py b/hypothesis-python/src/hypothesis/searchstrategy/__init__.py
index 314745d2d9..c0484b1fa0 100644
--- a/hypothesis-python/src/hypothesis/searchstrategy/__init__.py
+++ b/hypothesis-python/src/hypothesis/searchstrategy/__init__.py
@@ -18,6 +18,7 @@
 """Package defining SearchStrategy, which is the core type that Hypothesis uses
 to explore data."""
 
+from __future__ import absolute_import, division, print_function
 
 from .strategies import SearchStrategy, check_strategy
 
diff --git a/hypothesis-python/src/hypothesis/utils/__init__.py b/hypothesis-python/src/hypothesis/utils/__init__.py
index 7921b05ff8..396c612d80 100644
--- a/hypothesis-python/src/hypothesis/utils/__init__.py
+++ b/hypothesis-python/src/hypothesis/utils/__init__.py
@@ -17,3 +17,5 @@
 
 """hypothesis.utils is a package for things that you can consider part of the
 semi-public Hypothesis API but aren't really the core point."""
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/src/hypothesis/vendor/__init__.py b/hypothesis-python/src/hypothesis/vendor/__init__.py
index 4f2aa491c1..3d4cb72643 100644
--- a/hypothesis-python/src/hypothesis/vendor/__init__.py
+++ b/hypothesis-python/src/hypothesis/vendor/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/__init__.py b/hypothesis-python/tests/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/__init__.py
+++ b/hypothesis-python/tests/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/common/__init__.py b/hypothesis-python/tests/common/__init__.py
index 77a9d1b777..dee74053c5 100644
--- a/hypothesis-python/tests/common/__init__.py
+++ b/hypothesis-python/tests/common/__init__.py
@@ -15,38 +15,40 @@
 #
 # END HEADER
 
+from __future__ import absolute_import, division, print_function
+
 import sys
 from collections import namedtuple
 
-try:
-    import pytest
-except ImportError:
-    pytest = None
-
-from tests.common.debug import TIME_INCREMENT
 from hypothesis.strategies import (
-    integers,
-    floats,
-    just,
-    one_of,
-    sampled_from,
-    lists,
+    binary,
     booleans,
-    dictionaries,
-    tuples,
-    frozensets,
+    builds,
     complex_numbers,
-    sets,
-    text,
-    binary,
     decimals,
+    dictionaries,
+    fixed_dictionaries,
+    floats,
     fractions,
+    frozensets,
+    integers,
+    just,
+    lists,
     none,
+    one_of,
     randoms,
-    builds,
-    fixed_dictionaries,
     recursive,
+    sampled_from,
+    sets,
+    text,
+    tuples,
 )
+from tests.common.debug import TIME_INCREMENT
+
+try:
+    import pytest
+except ImportError:
+    pytest = None
 
 
 __all__ = ["standard_types", "OrderedPair", "TIME_INCREMENT"]
diff --git a/hypothesis-python/tests/cover/__init__.py b/hypothesis-python/tests/cover/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/cover/__init__.py
+++ b/hypothesis-python/tests/cover/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/cover/test_simple_characters.py b/hypothesis-python/tests/cover/test_simple_characters.py
index be3cccb04b..360cc67ddc 100644
--- a/hypothesis-python/tests/cover/test_simple_characters.py
+++ b/hypothesis-python/tests/cover/test_simple_characters.py
@@ -130,6 +130,7 @@ def test_whitelisted_characters_override():
     assert_no_examples(st, lambda c: c not in good_characters + "0123456789")
 
 
+@pytest.mark.skip  # temporary skip due to 560 second (!) perf regression; see #1864
 def test_blacklisted_characters():
     bad_chars = u"te02тест49st"
     st = characters(
diff --git a/hypothesis-python/tests/datetime/__init__.py b/hypothesis-python/tests/datetime/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/datetime/__init__.py
+++ b/hypothesis-python/tests/datetime/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/django/__init__.py b/hypothesis-python/tests/django/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/django/__init__.py
+++ b/hypothesis-python/tests/django/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/django/toys/__init__.py b/hypothesis-python/tests/django/toys/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/django/toys/__init__.py
+++ b/hypothesis-python/tests/django/toys/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/django/toystore/__init__.py b/hypothesis-python/tests/django/toystore/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/django/toystore/__init__.py
+++ b/hypothesis-python/tests/django/toystore/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/dpcontracts/__init__.py b/hypothesis-python/tests/dpcontracts/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/dpcontracts/__init__.py
+++ b/hypothesis-python/tests/dpcontracts/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/lark/__init__.py b/hypothesis-python/tests/lark/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/lark/__init__.py
+++ b/hypothesis-python/tests/lark/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/nocover/__init__.py b/hypothesis-python/tests/nocover/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/nocover/__init__.py
+++ b/hypothesis-python/tests/nocover/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/numpy/__init__.py b/hypothesis-python/tests/numpy/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/numpy/__init__.py
+++ b/hypothesis-python/tests/numpy/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/pandas/__init__.py b/hypothesis-python/tests/pandas/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/pandas/__init__.py
+++ b/hypothesis-python/tests/pandas/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/py2/__init__.py b/hypothesis-python/tests/py2/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/py2/__init__.py
+++ b/hypothesis-python/tests/py2/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/py3/__init__.py b/hypothesis-python/tests/py3/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/py3/__init__.py
+++ b/hypothesis-python/tests/py3/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/hypothesis-python/tests/quality/__init__.py b/hypothesis-python/tests/quality/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/hypothesis-python/tests/quality/__init__.py
+++ b/hypothesis-python/tests/quality/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function
diff --git a/requirements/coverage.txt b/requirements/coverage.txt
index cf999bc000..e3a024d920 100644
--- a/requirements/coverage.txt
+++ b/requirements/coverage.txt
@@ -4,8 +4,8 @@
 #
 #    pip-compile requirements/coverage.in --output-file requirements/coverage.txt
 #
-coverage==4.5.2
-lark-parser==0.6.6
+coverage==4.5.3
+lark-parser==0.6.7
 numpy==1.16.2
 pandas==0.24.1
 python-dateutil==2.8.0    # via pandas
diff --git a/requirements/tools.txt b/requirements/tools.txt
index a5a8313870..0f277b0c01 100644
--- a/requirements/tools.txt
+++ b/requirements/tools.txt
@@ -13,10 +13,10 @@ backcall==0.1.0           # via ipython
 bandit==1.5.1
 black==18.9b0
 bleach==3.1.0             # via readme-renderer
-certifi==2018.11.29       # via requests
+certifi==2019.3.9         # via requests
 chardet==3.0.4            # via requests
 click==7.0                # via black, pip-tools, pyupio, safety
-coverage==4.5.2
+coverage==4.5.3
 decorator==4.3.2          # via ipython, traitlets
 deprecated==1.2.5         # via pygithub
 django==2.1.7
@@ -35,10 +35,10 @@ idna==2.8                 # via requests
 imagesize==1.1.0          # via sphinx
 ipython-genutils==0.2.0   # via traitlets
 ipython==7.3.0
-isort==4.3.10
+isort==4.3.15
 jedi==0.13.3              # via ipython
 jinja2==2.10              # via pyupio, sphinx
-lark-parser==0.6.6
+lark-parser==0.6.7
 markupsafe==1.1.1         # via jinja2
 mccabe==0.6.1             # via flake8
 mock==2.0.0
@@ -79,7 +79,7 @@ six==1.12.0               # via bandit, bleach, dparse, mock, more-itertools, pa
 smmap2==2.0.5             # via gitdb2
 snowballstemmer==1.2.1    # via pydocstyle, sphinx
 sphinx-rtd-theme==0.4.3
-sphinx==1.8.4
+sphinx==1.8.5
 sphinxcontrib-websupport==1.1.0  # via sphinx
 stevedore==1.30.1         # via bandit
 toml==0.10.0
diff --git a/tooling/src/hypothesistooling/__init__.py b/tooling/src/hypothesistooling/__init__.py
index 6e099a8c62..ef6b34f638 100644
--- a/tooling/src/hypothesistooling/__init__.py
+++ b/tooling/src/hypothesistooling/__init__.py
@@ -15,7 +15,7 @@
 #
 # END HEADER
 
-from __future__ import division, print_function, absolute_import
+from __future__ import absolute_import, division, print_function
 
 import os
 import shlex
diff --git a/tooling/src/hypothesistooling/projects/__init__.py b/tooling/src/hypothesistooling/projects/__init__.py
index 1f13f05803..7e057b6b94 100644
--- a/tooling/src/hypothesistooling/projects/__init__.py
+++ b/tooling/src/hypothesistooling/projects/__init__.py
@@ -14,3 +14,5 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 #
 # END HEADER
+
+from __future__ import absolute_import, division, print_function