diff --git a/Pipfile b/Pipfile
index 7ca6ae1e9..818700743 100644
--- a/Pipfile
+++ b/Pipfile
@@ -29,7 +29,7 @@ twilio = ">=7.0.0"
 uvloop = {version = "*", markers = "sys_platform != 'win32'"}
 
 [dev-packages]
-hypothesis = "<=6.47.1"  # Later versions add a prerelease dependency. See https://github.com/pypa/pipenv/issues/1760
+hypothesis = "*"  # Versions between 6.47.1 and 6.56.4 added a prerelease dependency. See https://github.com/pypa/pipenv/issues/1760
 pdoc3 = "*"
 pytest = "*"
 pytest-asyncio = "*"
diff --git a/Pipfile.lock b/Pipfile.lock
index d99ed9e25..80d8f40df 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "dda5f2cc5ba985d2e558bad43e5994fbf581c42bf1fd2a40ad8ca6f27cac9f74"
+            "sha256": "b3da1b047f70a6659401f07cd87ba09dbec53472d498b333134e4e7e4db7d9f6"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -670,7 +670,7 @@
                 "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86",
                 "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2'",
             "version": "==2.8.2"
         },
         "pytz": {
@@ -747,7 +747,7 @@
                 "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
                 "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2'",
             "version": "==1.16.0"
         },
         "sortedcontainers": {
@@ -1049,11 +1049,11 @@
         },
         "hypothesis": {
             "hashes": [
-                "sha256:4ad26c5d434171ffc02aba569dd52255573d615554c062bc30734dbe6f318c61",
-                "sha256:69978811f1d9c19710c7d2bf8233dc43c80efa964251b72efbe8274044e073b4"
+                "sha256:1901688aac1fc8d78d5431c4a1d48cc50940e247dd8b6ebc3d4167ef31204e10",
+                "sha256:2fd2c9640ea4b64d06fafc8d9aa8e9cbae365879d109a859afd37dda5c1ffb55"
             ],
             "index": "pypi",
-            "version": "==6.47.1"
+            "version": "==6.72.1"
         },
         "iniconfig": {
             "hashes": [
@@ -1204,7 +1204,7 @@
                 "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
                 "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
             ],
-            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2'",
             "version": "==0.10.2"
         },
         "tomli": {
diff --git a/tests/utils/hypothesis.py b/tests/utils/hypothesis.py
index d1dc0a154..f6cb81163 100644
--- a/tests/utils/hypothesis.py
+++ b/tests/utils/hypothesis.py
@@ -1,11 +1,12 @@
 import asyncio
 import contextlib
-import inspect
 import itertools
+from inspect import Parameter, Signature
 
 import pytest
 from hypothesis.internal.reflection import (
     define_function_signature,
+    get_signature,
     impersonate
 )
 
@@ -18,13 +19,13 @@ def autocontext(*auto_args):
     that requires the `request` fixture won't work.
     """
     def decorate_test(test):
-        original_argspec = inspect.getfullargspec(test)
-        argspec = new_argspec(original_argspec, auto_args)
+        original_signature = get_signature(test)
+        signature = new_signature(original_signature, auto_args)
 
         if asyncio.iscoroutinefunction(test):
             @pytest.mark.asyncio
             @impersonate(test)
-            @define_function_signature(test.__name__, test.__doc__, argspec)
+            @define_function_signature(test.__name__, test.__doc__, signature)
             async def wrapped_test(*args, **kwargs):
                 # Tell pytest to omit the body of this function from tracebacks
                 __tracebackhide__ = True
@@ -54,7 +55,7 @@ async def wrapped_test(*args, **kwargs):
             return wrapped_test
         else:
             @impersonate(test)
-            @define_function_signature(test.__name__, test.__doc__, argspec)
+            @define_function_signature(test.__name__, test.__doc__, signature)
             def wrapped_test(*args, **kwargs):
                 # Tell pytest to omit the body of this function from tracebacks
                 __tracebackhide__ = True
@@ -77,25 +78,19 @@ def wrapped_test(*args, **kwargs):
     return decorate_test
 
 
-def new_argspec(original_argspec, auto_args):
-    """Make an updated argspec for the wrapped test."""
-    replaced_args = {
-        original_arg: auto_arg
-        for original_arg, auto_arg in zip(
-            original_argspec.args[:len(auto_args)],
-            auto_args
-        )
-    }
-    new_args = tuple(itertools.chain(
-        auto_args,
-        original_argspec.args[len(auto_args):]
+def new_signature(original_signature: Signature, auto_args):
+    """Make an updated signature for the wrapped test."""
+    # Replace the parameter names in the original signature with the names
+    # of the fixtures given to @autocontext(...) so that pytest will inject the
+    # right fixtures.
+    new_parameters = tuple(itertools.chain(
+        [
+            Parameter(name, Parameter.POSITIONAL_OR_KEYWORD)
+            for name in auto_args
+        ],
+        list(original_signature.parameters.values())[len(auto_args):]
     ))
-    annots = {
-        replaced_args.get(k) or k: v
-        for k, v in original_argspec.annotations.items()
-    }
-    annots["return"] = None
-    return original_argspec._replace(
-        args=new_args,
-        annotations=annots
+    return original_signature.replace(
+        parameters=new_parameters,
+        return_annotation=None
     )