diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ca39a6f..6f01234 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -13,7 +13,7 @@ repos:
     - id: reformat-pyproject
 
  - repo: https://github.com/pre-commit/pre-commit-hooks
-   rev: v3.4.0
+   rev: v4.4.0
    hooks:
     - id: check-added-large-files
     - id: check-ast
@@ -54,7 +54,7 @@ repos:
     - id: flake2lint
 
  - repo: https://github.com/pre-commit/pygrep-hooks
-   rev: v1.9.0
+   rev: v1.10.0
    hooks:
     - id: python-no-eval
     - id: rst-backticks
@@ -62,7 +62,7 @@ repos:
     - id: rst-inline-touching-normal
 
  - repo: https://github.com/asottile/pyupgrade
-   rev: v2.12.0
+   rev: v3.3.1
    hooks:
     - id: pyupgrade
       args:
@@ -70,7 +70,7 @@ repos:
        - --keep-runtime-typing
 
  - repo: https://github.com/Lucas-C/pre-commit-hooks
-   rev: v1.3.1
+   rev: v1.5.1
    hooks:
     - id: remove-crlf
     - id: forbid-crlf
diff --git a/requirements.txt b/requirements.txt
index 7aac836..1881e8e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 cawdrey>=0.3.0
 domdf-python-tools>=1.7.0
-matplotlib==3.2.2; platform_machine == "aarch64" and python_version == "3.6"
 matplotlib>=3.2.2; platform_machine != "aarch64" or python_version > "3.6"
+matplotlib==3.2.2; platform_machine == "aarch64" and python_version == "3.6"
 typing-extensions>=3.7.4.3
diff --git a/tests/common.py b/tests/common.py
index e41a23a..040c6f4 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -1,5 +1,7 @@
-# 3rd party
+# stdlib
 import sys
+
+# 3rd party
 import pytest
 from domdf_python_tools.paths import PathPlus
 
diff --git a/tests/image_hashes.json b/tests/image_hashes.json
index a03c4b5..2aaf62b 100644
--- a/tests/image_hashes.json
+++ b/tests/image_hashes.json
@@ -11,4 +11,4 @@
   "tests.test_plots.test_plot_pie_from_tally[default-False]": "98b4851c6ea6e7f77451528432aa80c8e62a6eec1cdba203edb14e847246c839",
   "tests.test_plots.test_plot_pie_from_tally_no_explode[domdf-True]": "341932941d97127a32450562905b42ce9a7a77b2a990c5f76e4dc8875d946299",
   "tests.test_plots.test_plot_pie_from_tally[domdf-True]": "d93c4b4043ee5b0ba8bfa06033f7702693a24d04a4065d0b05a2024477ce9628"
-}
\ No newline at end of file
+}
diff --git a/tests/image_hashes_310.json b/tests/image_hashes_310.json
index ab28538..dc7637a 100644
--- a/tests/image_hashes_310.json
+++ b/tests/image_hashes_310.json
@@ -11,4 +11,4 @@
   "tests.test_plots.test_plot_pie_from_tally[default-True]": "b0bad9b9e409ee553000cfc92593002b77dc7417de1ad6747527f81f5b3e06e1",
   "tests.test_plots.test_plot_pie_from_tally[domdf-True]": "32d73f605f4488ca74652a438b682d65a0c08554d566c84862c0f2bfde4d74c3",
   "tests.test_plots.test_plot_pie_from_tally[default-False]": "268e34adb14bc672923aeadeddb637058cc529be229df3a39dfefdf07d956b9a"
-}
\ No newline at end of file
+}
diff --git a/tests/image_hashes_311.json b/tests/image_hashes_311.json
index 52cfb11..f749a0e 100644
--- a/tests/image_hashes_311.json
+++ b/tests/image_hashes_311.json
@@ -11,4 +11,4 @@
   "tests.test_domplotlib.test_horizontal_legend[h_bar_chart]": "51ac75fbab552c499559454e13f6b4af05e5072ea36211c803d97152631d575b",
   "tests.test_domplotlib.test_horizontal_legend_markevery": "8e04513303384eb0f487b493f1a3e6ea0fb5d230d691fdf170b62e2d1307b7ad",
   "tests.test_domplotlib.test_horizontal_legend[hatch_filled_histograms]": "725fd151c51d077289d408d3869d28dca3e1297e0f91594581cd9054c57daa14"
-}
\ No newline at end of file
+}
diff --git a/tests/image_hashes_37.json b/tests/image_hashes_37.json
index 6a4fbd2..b13a488 100644
--- a/tests/image_hashes_37.json
+++ b/tests/image_hashes_37.json
@@ -11,4 +11,4 @@
   "tests.test_plots.test_plot_pie_from_tally_no_explode[default-True]": "05b6a263d4ea616e125b35f5e926365e216ddd0e66ca2c23e8dd88efdeef97f4",
   "tests.test_plots.test_plot_pie_from_tally_no_explode[domdf-False]": "eb13c236e83285d5d4dc7e597b3b4cddfd6960c8edcda56cc0985af0cbbcc3bb",
   "tests.test_plots.test_plot_pie_from_tally[default-True]": "8b4b95df6df0d6fd38e06ce1e442ad71d4433d411746591d4982e37fa564818d"
-}
\ No newline at end of file
+}
diff --git a/tests/image_hashes_38.json b/tests/image_hashes_38.json
index 75b243d..90c8b74 100644
--- a/tests/image_hashes_38.json
+++ b/tests/image_hashes_38.json
@@ -11,4 +11,4 @@
   "tests.test_plots.test_plot_pie_from_tally[default-False]": "268e34adb14bc672923aeadeddb637058cc529be229df3a39dfefdf07d956b9a",
   "tests.test_plots.test_plot_pie_from_tally[domdf-False]": "8cb25045e767f6881919c262542a5f448ef08fdcdd033a27f0304a3ed5070caf",
   "tests.test_plots.test_plot_pie_from_tally[domdf-True]": "32d73f605f4488ca74652a438b682d65a0c08554d566c84862c0f2bfde4d74c3"
-}
\ No newline at end of file
+}
diff --git a/tests/image_hashes_39.json b/tests/image_hashes_39.json
index a0fc0df..8b07fc2 100644
--- a/tests/image_hashes_39.json
+++ b/tests/image_hashes_39.json
@@ -11,4 +11,4 @@
   "tests.test_domplotlib.test_horizontal_legend[koch_snowflake]": "f651cd5f5e69b28b80d7b07c70a95ab051a0a38ae96c14d9e2e1f4e1278d2f81",
   "tests.test_domplotlib.test_horizontal_legend_markevery": "8e04513303384eb0f487b493f1a3e6ea0fb5d230d691fdf170b62e2d1307b7ad",
   "tests.test_domplotlib.test_horizontal_legend[h_bar_chart]": "51ac75fbab552c499559454e13f6b4af05e5072ea36211c803d97152631d575b"
-}
\ No newline at end of file
+}