diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 24a7a36..0f4fe03 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -53,12 +53,6 @@ Make a new release tag:
     $ git tag x.x.x
     $ git push --tags
 
-If you have a development install locally, you can verify:
-
-.. code-block:: bash
-
-    $ merkle-tree-stream --version
-
 Then run the release process:
 
 .. code-block:: bash
diff --git a/README.rst b/README.rst
index 622fa6f..00ae367 100644
--- a/README.rst
+++ b/README.rst
@@ -1,8 +1,8 @@
 .. _header:
 
-************************
+******************
 merkle-tree-stream
-************************
+******************
 
 .. image:: https://img.shields.io/badge/license-MIT-brightgreen.svg
    :target: LICENSE
diff --git a/merkle-tree-stream/__init__.py b/merkle_tree_stream/__init__.py
similarity index 71%
rename from merkle-tree-stream/__init__.py
rename to merkle_tree_stream/__init__.py
index 4d429f8..4dc634a 100644
--- a/merkle-tree-stream/__init__.py
+++ b/merkle_tree_stream/__init__.py
@@ -7,6 +7,6 @@ except ImportError:
 
 
 try:
-    __version__ = pkg_resources.get_distribution('merkle-tree-stream').version
+    __version__ = pkg_resources.get_distribution('merkle_tree_stream').version
 except Exception:
     __version__ = 'unknown'
diff --git a/pyproject.toml b/pyproject.toml
index 343e51d..07b72d6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ include = '\.pyi?$'
 directory = "changelog/"
 filename = "CHANGELOG.rst"
 package = "merkle-tree-stream"
-package_dir = "merkle-tree-stream"
+package_dir = "merkle_tree_stream"
 
   [[tool.towncrier.type]]
   directory = "removal"
diff --git a/setup.cfg b/setup.cfg
index 7a50782..81f099b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -5,7 +5,7 @@ testpaths = test
 max-line-length = 80
 
 [isort]
-known_first_party = merkle-tree-stream
+known_first_party = merkle_tree_stream
 known_third_party = pytest
 line_length = 80
 multi_line_output = 3
diff --git a/test/test_version.py b/test/test_version.py
index 085ba9a..38e370c 100644
--- a/test/test_version.py
+++ b/test/test_version.py
@@ -4,6 +4,6 @@
 def test_version_fails_gracefully(mocker):
     target = 'pkg_resources.get_distribution'
     with mocker.patch(target, side_effect=Exception()):
-        from merkle-tree-stream.__init__ import __version__
+        from merkle_tree_stream.__init__ import __version__
 
         assert __version__ == 'unknown'
diff --git a/tox.ini b/tox.ini
index 216c91a..21ed0ae 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ deps =
   pytest-cov
   pytest-mock
 commands = 
-  pytest test/ --cov={toxinidir}/merkle-tree-stream/ --no-cov-on-fail {posargs}
+  pytest test/ --cov={toxinidir}/merkle_tree_stream/ --no-cov-on-fail {posargs}
 
 [testenv:lint]
 description = lint the source
@@ -26,7 +26,7 @@ skipdist = True
 deps = 
   flake8
 commands = 
-  flake8 {posargs} merkle-tree-stream/ test/
+  flake8 {posargs} merkle_tree_stream/ test/
 
 [testenv:sort]
 description = sort the source
@@ -34,7 +34,7 @@ skipdist = True
 deps = 
   isort
 commands = 
-  isort {posargs:-rc -c} -sp setup.cfg merkle-tree-stream/ test/
+  isort {posargs:-rc -c} -sp setup.cfg merkle_tree_stream/ test/
 
 [testenv:format]
 description = format the source
@@ -43,7 +43,7 @@ basepython = python3.6
 deps = 
   black
 commands = 
-  black {posargs:--check} merkle-tree-stream/ test/
+  black {posargs:--check} merkle_tree_stream/ test/
 
 [testenv:type]
 description = type check the source
@@ -52,7 +52,7 @@ skipdist = True
 deps = 
   mypy
 commands = 
-  mypy merkle-tree-stream/ test/
+  mypy merkle_tree_stream/ test/
 
 [testenv:docs]
 description = build the documentation