diff --git a/Pipfile b/Pipfile
index 5df74b0b..3ebde53c 100644
--- a/Pipfile
+++ b/Pipfile
@@ -7,7 +7,4 @@ sphinx = "<=1.5.5"
 "-e ." = "*"
 twine = "*"
 "sphinx-click" = "*"
-"pytest-xdist" = {version = "*", os_name = "=='posix'"}
-
-
-
+"pytest-xdist" = *
\ No newline at end of file
diff --git a/appveyor.yml b/appveyor.yml
index 364857c8..cf243cd9 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -52,4 +52,4 @@ install:
   - "pipenv install --system --dev --skip-lock"
 
 test_script:
-  - "pytest tests/test_pipenv.py tests/test_project.py tests/test_utils.py"
+  - "pipenv run pytest -n 8 tests/test_pipenv.py tests/test_project.py tests/test_utils.py"