diff --git a/.github/workflows/ci-lint.yml b/.github/workflows/ci-lint.yml
index 10fdfff..e1cac55 100644
--- a/.github/workflows/ci-lint.yml
+++ b/.github/workflows/ci-lint.yml
@@ -9,3 +9,5 @@ jobs:
       - uses: actions/checkout@v4
       - uses: psf/black@stable
       - uses: isort/isort-action@v1
+        with:
+          sort-paths: PyEMD
diff --git a/.github/workflows/ci-pr-test.yml b/.github/workflows/ci-pr-test.yml
index 3f8d74f..455bf6a 100644
--- a/.github/workflows/ci-pr-test.yml
+++ b/.github/workflows/ci-pr-test.yml
@@ -15,7 +15,12 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.8, 3.9, 3.10, 3.11, 3.12]
+        python-version: 
+          - "3.8"
+          - "3.9"
+          - "3.10"
+          - "3.11"
+          - "3.12"
 
     steps:
       - uses: actions/checkout@v4
diff --git a/Makefile b/Makefile
index 2169760..d41b949 100644
--- a/Makefile
+++ b/Makefile
@@ -10,8 +10,8 @@ doc:
 	cd doc && make html
 
 format:
-	black PyEMD
+	python -m black PyEMD doc
 
 lint-check:
 	python -m isort --check PyEMD
-	python -m black --check PyEMD
\ No newline at end of file
+	python -m black --check PyEMD doc
\ No newline at end of file
diff --git a/PyEMD/checks.py b/PyEMD/checks.py
index 80d14a1..8818d11 100644
--- a/PyEMD/checks.py
+++ b/PyEMD/checks.py
@@ -1,4 +1,5 @@
 """Calculate the statistical Significance of IMFs."""
+
 import logging
 import math
 
diff --git a/PyEMD/tests/test_checks.py b/PyEMD/tests/test_checks.py
index 7945e35..874f359 100644
--- a/PyEMD/tests/test_checks.py
+++ b/PyEMD/tests/test_checks.py
@@ -1,4 +1,5 @@
 """Tests for checks.py."""
+
 import unittest
 
 import numpy as np
diff --git a/doc/conf.py b/doc/conf.py
index 6d91db0..183b63e 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -65,25 +65,25 @@
 master_doc = "index"
 
 # General information about the project.
-project = u"PyEMD"
-copyright = u"2016-{year}, Dawid Laszuk".format(year=datetime.datetime.now().year)
-author = u"Dawid Laszuk"
+project = "PyEMD"
+copyright = "2016-{year}, Dawid Laszuk".format(year=datetime.datetime.now().year)
+author = "Dawid Laszuk"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
-version = u"0.4.0"
+version = "0.4.0"
 # The full version, including alpha/beta/rc tags.
-release = u"0.4.0"
+release = "0.4.0"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = 'en'
+language = "en"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
@@ -142,7 +142,7 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, "PyEMD.tex", u"PyEMD Documentation", u"Dawid Laszuk", "manual"),
+    (master_doc, "PyEMD.tex", "PyEMD Documentation", "Dawid Laszuk", "manual"),
 ]
 
 
@@ -150,7 +150,7 @@
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [(master_doc, "PyEMD", u"PyEMD Documentation", [author], 1)]
+man_pages = [(master_doc, "PyEMD", "PyEMD Documentation", [author], 1)]
 
 
 # -- Options for Texinfo output -------------------------------------------
@@ -159,7 +159,7 @@
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-    (master_doc, "PyEMD", u"PyEMD Documentation", author, "PyEMD", "One line description of project.", "Miscellaneous"),
+    (master_doc, "PyEMD", "PyEMD Documentation", author, "PyEMD", "One line description of project.", "Miscellaneous"),
 ]