diff --git a/.gitignore b/.gitignore
index 8a6358d7..8bbcbaec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -142,4 +142,7 @@ cython_debug/
 docs/build
 
 .vscode
-.idea/
\ No newline at end of file
+.idea/
+
+# Developer's playground
+/playground/
diff --git a/Makefile b/Makefile
index 9abc3175..675a6f7b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,12 @@
 ifeq ($(check),1)
-	ISORT_ARG= --check-only
-	BLACK_ARG= --check
+	CHECK_ARG= --check
 else
-	ISORT_ARG=
-	BLACK_ARG=
+	CHECK_ARG=
 endif
 
 lint:
-	isort $(ISORT_ARG) --project popmon --thirdparty histogrammar --thirdparty pybase64 --multi-line=3 --trailing-comma --force-grid-wrap=0 --use-parentheses --line-width=88 -y
-	black $(BLACK_ARG) .
+	isort $(CHECK_ARG) --profile black --project popmon --thirdparty histogrammar --thirdparty pybase64 .
+	black $(CHECK_ARG) .
 
 install:
 	pip install -e .
diff --git a/make.bat b/make.bat
index 9cdb7d92..2c7bfbc9 100644
--- a/make.bat
+++ b/make.bat
@@ -4,14 +4,12 @@ setlocal enabledelayedexpansion
 
 IF "%1%" == "lint" (
 	IF "%2%" == "check" (
-		SET ISORT_ARG= --check-only
-		SET BLACK_ARG= --check
+		SET CHECK_ARG= --check
 	) ELSE (
-		set ISORT_ARG=
-		set BLACK_ARG=
+		set CHECK_ARG=
 	)
-	isort !ISORT_ARG! --project popmon --thirdparty histogrammar --thirdparty pybase64 --multi-line=3 --trailing-comma --force-grid-wrap=0 --use-parentheses --line-width=88 -y
-	black !BLACK_ARG! .
+	isort !CHECK_ARG! --profile black --project popmon --thirdparty histogrammar --thirdparty pybase64 .
+	black !CHECK_ARG! .
 	GOTO end
 )
 
diff --git a/popmon/analysis/profiling/hist_profiler.py b/popmon/analysis/profiling/hist_profiler.py
index db0f410d..d09e5689 100644
--- a/popmon/analysis/profiling/hist_profiler.py
+++ b/popmon/analysis/profiling/hist_profiler.py
@@ -22,7 +22,7 @@
 import pandas as pd
 from phik import phik
 
-import popmon.stats.numpy as pm_np
+from popmon.stats import numpy as pm_np
 
 from ...analysis.hist_numpy import get_2dgrid
 from ...base import Module
diff --git a/popmon/hist/filling/spark_histogrammar.py b/popmon/hist/filling/spark_histogrammar.py
index cddf698d..e5d0b7f3 100644
--- a/popmon/hist/filling/spark_histogrammar.py
+++ b/popmon/hist/filling/spark_histogrammar.py
@@ -15,7 +15,8 @@
 
 try:
     from pyspark.sql import DataFrame
-    from pyspark.sql.functions import col as sparkcol, approxCountDistinct
+    from pyspark.sql.functions import approxCountDistinct
+    from pyspark.sql.functions import col as sparkcol
 except (ModuleNotFoundError, AttributeError):
     pass
 
diff --git a/popmon/visualization/backend.py b/popmon/visualization/backend.py
index 954a8859..3c6e50fa 100644
--- a/popmon/visualization/backend.py
+++ b/popmon/visualization/backend.py
@@ -148,7 +148,7 @@ def in_ipynb():
     :rtype: bool
     """
     try:
-        import IPython.core.getipython as gip
+        from IPython.core import getipython as gip
 
         cfg = gip.get_ipython().config
         return True if "IPKernelApp" in cfg.keys() else False
diff --git a/popmon/visualization/utils.py b/popmon/visualization/utils.py
index 3a6411d7..ad51c59f 100644
--- a/popmon/visualization/utils.py
+++ b/popmon/visualization/utils.py
@@ -22,11 +22,11 @@
 import math
 from io import BytesIO
 
-import matplotlib.pyplot as plt
 import numpy as np
 import pandas as pd
 import pybase64
 from ing_theme_matplotlib import mpl_style
+from matplotlib import pyplot as plt
 
 NUM_NS_DAY = 24 * 3600 * int(1e9)
 
diff --git a/requirements-test.txt b/requirements-test.txt
index ac78bb5d..d935bc45 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,8 +1,7 @@
 flake8>=3.7.8
 pytest>=4.0.2
-pytest-pylint>=0.13.0
 nbconvert>=5.3.1
 jupyter_client>=5.2.3
 ipykernel>=5.1.3
 black>=19.10b0
-isort==4.3.21
+isort>=5.0.7
\ No newline at end of file