diff --git a/cellprofiler_core/__init__.py b/cellprofiler_core/__init__.py
index 6e96fc64..213df64a 100644
--- a/cellprofiler_core/__init__.py
+++ b/cellprofiler_core/__init__.py
@@ -1 +1 @@
-__version__ = "4.2.7"
+__version__ = "4.2.8"
diff --git a/cellprofiler_core/__main__.py b/cellprofiler_core/__main__.py
index e2d6fe32..e69de29b 100644
--- a/cellprofiler_core/__main__.py
+++ b/cellprofiler_core/__main__.py
@@ -1,55 +0,0 @@
-import os
-import pathlib
-
-import click
-
-import cellprofiler_core.commands
-
-CONTEXT_SETTINGS = dict(auto_envvar_prefix="COMPLEX")
-
-
-class Command(click.MultiCommand):
-    def get_command(self, context, name):
-        try:
-            name = f"cellprofiler_core.commands._{name}_command"
-
-            imported_module = __import__(name, None, None, ["command"])
-        except ImportError:
-            return
-
-        return imported_module.command
-
-    def list_commands(self, context):
-        command_names = []
-
-        commands_pathname = cellprofiler_core.commands.__file__
-
-        commands_directory = pathlib.Path(commands_pathname).parent
-
-        for filename in os.listdir(commands_directory):
-            if filename.endswith("_command.py") and filename.startswith("_"):
-                command_name = filename[1:-11]
-
-                command_names += [command_name]
-
-        command_names.sort()
-
-        return command_names
-
-
-class Environment:
-    def __init__(self):
-        pass
-
-
-pass_environment = click.make_pass_decorator(Environment, ensure=True)
-
-
-@click.command(cls=Command, context_settings=CONTEXT_SETTINGS)
-@pass_environment
-def main(context):
-    pass
-
-
-if __name__ == "__main__":
-    main({})
diff --git a/cellprofiler_core/commands/__init__.py b/cellprofiler_core/commands/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/cellprofiler_core/commands/_pipeline_command.py b/cellprofiler_core/commands/_pipeline_command.py
deleted file mode 100644
index 4a5d3d78..00000000
--- a/cellprofiler_core/commands/_pipeline_command.py
+++ /dev/null
@@ -1,40 +0,0 @@
-import click
-
-from ..__main__ import pass_environment
-
-
-@click.group("pipeline")
-@pass_environment
-def command(context):
-    pass
-
-
-@command.command("measurements", help="returns measurements extracted by the pipeline")
-@pass_environment
-def measurements(context):
-    pass
-
-
-@command.command("run", help="executes the pipeline")
-@click.argument("pipeline", type=click.File("r"))
-@click.option("--batch-size", type=int)
-@click.option("--data", type=click.Path())
-@click.option("--default-images-directory", type=click.Path())
-@click.option("--default-output-directory", type=click.Path())
-@click.option("--images", multiple=True, type=click.Path())
-@click.option("--beginning", default=1, type=int)
-@click.option("--end", type=int)
-@click.option("--group", type=str)
-@pass_environment
-def run(
-    context,
-    batch_size,
-    data,
-    images_directory,
-    output_directory,
-    images,
-    beginning,
-    end,
-    grouping,
-):
-    pass
diff --git a/cellprofiler_core/commands/_worker_command.py b/cellprofiler_core/commands/_worker_command.py
deleted file mode 100644
index b2298f77..00000000
--- a/cellprofiler_core/commands/_worker_command.py
+++ /dev/null
@@ -1,15 +0,0 @@
-import click
-
-from ..__main__ import pass_environment
-
-
-@click.group("worker")
-@pass_environment
-def command(context):
-    pass
-
-
-@command.command("start")
-@pass_environment
-def start(context):
-    pass
diff --git a/docs/conf.py b/docs/conf.py
index 3f7911ab..aff4ad8f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -12,6 +12,6 @@
 
 project = "CellProfiler-core"
 
-release = "4.2.7"
+release = "4.2.8"
 
 templates_path = ["_templates"]
diff --git a/setup.cfg b/setup.cfg
index 90ece8ce..4441e861 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,6 +3,6 @@ filterwarnings =
     ignore::DeprecationWarning
     ignore::FutureWarning
 minversion =
-    4.2.7
+    4.2.8
 testpaths =
     ./tests/
diff --git a/setup.py b/setup.py
index e3cef28b..a3461f70 100644
--- a/setup.py
+++ b/setup.py
@@ -8,16 +8,14 @@
         "License :: OSI Approved :: MIT License",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
     ],
     extras_require={
         "dev": [
-            "black==19.10b0",
-            "click>=7.1.2",
-            "pre-commit==2.2.0",
             "sphinx==3.1.2",
             "twine==3.1.1",
         ],
-        "test": ["pytest==5.4.1"],
+        "test": ["pytest~=7.4.1"],
         "wx": ["wxPython==4.1.0"],
     },
     install_requires=[
@@ -29,8 +27,8 @@
         "numpy>=1.18.2",
         "prokaryote==2.4.4",
         "psutil>=5.7.0",
-        "python-bioformats==4.0.7",
-        "python-javabridge==4.0.3",
+        "python-bioformats>=4.0.7,<5",
+        "python-javabridge>=4.0.3,<5",
         "pyzmq~=22.3",
         "scikit-image==0.18.3",
         "scipy>=1.4.1",
@@ -41,6 +39,6 @@
     packages=setuptools.find_packages(exclude=["tests"]),
     python_requires=">=3.8",
     url="https://github.com/CellProfiler/core",
-    version="4.2.7",
+    version="4.2.8",
     zip_safe=False,
 )