diff --git a/Makefile b/Makefile
index 8ec1f9c..b802845 100644
--- a/Makefile
+++ b/Makefile
@@ -39,7 +39,9 @@ test: ## run tests quickly with the default Python
 	py.test
 
 install: clean ## install the package to the active Python's site-packages
-	python setup.py install
+	pip install -e .
+#	pip install -r requirements.txt
+	pip install -r dev-requirements.txt
 
 clean: clean-build clean-pyc clean-test ## remove all build, test, coverage and Python artifacts
 
@@ -61,3 +63,6 @@ clean-test: ## remove test and coverage artifacts
 	rm -f .coverage
 	rm -fr htmlcov/
 	rm -fr .pytest_cache
+
+venv: ## Set up a new virtualenvironment
+	test -d .venv || virtualenv .venv --prompt='(toggl) '
diff --git a/dev-requirements.txt b/dev-requirements.txt
index e079f8a..ca225f9 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1 +1,3 @@
 pytest
+black
+jupyterlab
diff --git a/setup.py b/setup.py
index 643b042..6289f2b 100644
--- a/setup.py
+++ b/setup.py
@@ -8,9 +8,9 @@
     description="Toggl datawrangling in python.",
     packages=find_packages(),
     install_requires=[
-        "certifi==2018.1.18",
-        "pandas==0.22.0",
-        "pyaml==17.12.1",
-        "dateparser==0.6.0",
+        "certifi",
+        "pandas",
+        "pyaml",
+        "dateparser",
     ],
 )
diff --git a/tests/test_endpoints.py b/tests/test_endpoints.py
index 133ae4f..d2e4b5d 100644
--- a/tests/test_endpoints.py
+++ b/tests/test_endpoints.py
@@ -9,10 +9,7 @@ def test_static_endpoints():
     assert Endpoints.REPORT_SUMMARY == "https://toggl.com/reports/api/v2/summary"
     assert Endpoints.START_TIME == "https://www.toggl.com/api/v8/time_entries/start"
     assert Endpoints.TIME_ENTRIES == "https://www.toggl.com/api/v8/time_entries"
-    assert (
-        Endpoints.CURRENT_RUNNING_TIME
-        == "https://www.toggl.com/api/v8/time_entries/current"
-    )
+    assert Endpoints.CURRENT_RUNNING_TIME == "https://www.toggl.com/api/v8/time_entries/current"
     assert Endpoints.REPORT_WEEKLY == "https://toggl.com/reports/api/v2/weekly"
 
 
@@ -21,14 +18,8 @@ def test_stop_time():
 
 
 def test_workspacde_projects():
-    assert (
-        Endpoints.WORKSPACE_PROJECTS(1)
-        == "https://www.toggl.com/api/v8/workspaces/1/projects"
-    )
+    assert Endpoints.WORKSPACE_PROJECTS(1) == "https://www.toggl.com/api/v8/workspaces/1/projects"
 
 
 def test_client_projects():
-    assert (
-        Endpoints.CLIENT_PROJECTS(1)
-        == "https://www.toggl.com/api/v8/clients/1/projects"
-    )
+    assert Endpoints.CLIENT_PROJECTS(1) == "https://www.toggl.com/api/v8/clients/1/projects"
diff --git a/toggl/intacct/intacct.py b/toggl/intacct/intacct.py
index 330200a..aa8ad99 100644
--- a/toggl/intacct/intacct.py
+++ b/toggl/intacct/intacct.py
@@ -1,5 +1,4 @@
 import yaml
-
 import toggl
 
 INTACCT_CODE_MAPPING_FILENAME = "code_mapping.yml"