diff --git a/buildspec.yml b/buildspec.yml
index 63cba6fb..76fcbf88 100644
--- a/buildspec.yml
+++ b/buildspec.yml
@@ -17,7 +17,7 @@ phases:
       # run unit tests
       - AWS_ACCESS_KEY_ID= AWS_SECRET_ACCESS_KEY= AWS_SESSION_TOKEN=
         AWS_CONTAINER_CREDENTIALS_RELATIVE_URI= AWS_DEFAULT_REGION=
-        tox -v -e py38,py39,py310 --parallel all -- test/unit
+        tox -v -e py38,py39,py310 -- test/unit
 
       # build toolkit
       - python setup.py sdist
diff --git a/src/sagemaker_training/modules.py b/src/sagemaker_training/modules.py
index c791f4e5..8ba0ef63 100644
--- a/src/sagemaker_training/modules.py
+++ b/src/sagemaker_training/modules.py
@@ -128,7 +128,7 @@ def install(path, capture_error=False):  # type: (str, bool) -> None
             index = _get_codeartifact_index()
             cmd += " -i {}".format(index)
 
-    logger.info("Installing module with the following command:\n%s", cmd)
+    logger.info("Installing module.")
 
     process.check_error(
         shlex.split(cmd), errors.InstallModuleError, 1, cwd=path, capture_error=capture_error
@@ -148,7 +148,7 @@ def install_requirements(path, capture_error=False):  # type: (str, bool) -> Non
         index = _get_codeartifact_index()
         cmd += " -i {}".format(index)
 
-    logger.info("Installing dependencies from requirements.txt:\n{}".format(cmd))
+    logger.info("Installing dependencies from requirements.txt")
 
     process.check_error(
         shlex.split(cmd), errors.InstallRequirementsError, 1, cwd=path, capture_error=capture_error
diff --git a/tox.ini b/tox.ini
index 7d2d6e23..b2ea2266 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = black-format,flake8,pylint,twine,py39,py310
+envlist = black-format,flake8,pylint,twine,py38,py39,py310
 
 skip_missing_interpreters = False
 
@@ -44,6 +44,7 @@ commands =
 
 deps =
     pytest==6.2.5
+    coverage
     pytest-cov
     pytest-xdist
     pytest-asyncio