diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index c422629..2796621 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.8.1
+current_version = 3.9.0
 
 [bumpversion:file:mkdocs_include_markdown_plugin/__init__.py]
 
diff --git a/.editorconfig b/.editorconfig
index 077bcf0..6fd1d19 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -7,7 +7,7 @@ indent_style = space
 indent_size = 2
 trim_trailing_whitespace = true
 
-[*.{py,cfg}]
+[*.{py,cfg,ini}]
 indent_size = 4
 
 [*.{py,md}]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a4ec11f..a1316ca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,13 +13,15 @@ jobs:
   test:
     name: Test
     runs-on: ${{ matrix.os }}
+    env:
+      PYTEST_ADDOPTS: -vv
     strategy:
       matrix:
         os:
           - ubuntu-latest
           - windows-latest
+          - macos-latest
         python-version:
-          - 3.6
           - 3.7
           - 3.8
           - 3.9
@@ -27,23 +29,21 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python v${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip coveralls
-          python -m pip install .[test]
-          pip list
-      - name: Test with pytest
-        run: pytest -svv
+          python -m pip install -U pip coveralls tox tox-gh-actions
+      - name: Run tests
+        run: tox
       - name: Coveralls
         run: coveralls
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COVERALLS_SERVICE_NAME: github
       - name: Test examples
-        run: pytest -svv tests/_test_examples.py
+        run: tox -e examples
 
   build-sdist:
     if: startsWith(github.ref, 'refs/tags/')
diff --git a/.github/workflows/pre-commit-autoupdate.yml b/.github/workflows/pre-commit-autoupdate.yml
index 5fb410c..4b3bb4b 100644
--- a/.github/workflows/pre-commit-autoupdate.yml
+++ b/.github/workflows/pre-commit-autoupdate.yml
@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: 3.x
       - name: Install pre-commit
diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index a4be678..c38ee14 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: 3.x
       - name: Run pre-commit
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b7ef0c1..6c01a88 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.38.0
+    rev: v2.38.2
     hooks:
       - id: pyupgrade
         args:
@@ -15,7 +15,7 @@ repos:
       - id: double-quote-string-fixer
         name: double-quote-string-fixer
   - repo: https://github.com/asottile/add-trailing-comma
-    rev: v2.2.3
+    rev: v2.3.0
     hooks:
       - id: add-trailing-comma
         name: add-trailing-comma
@@ -42,7 +42,7 @@ repos:
           - --filter-files
         files: \.py$
   - repo: https://github.com/mondeja/mdpo
-    rev: v1.0.1
+    rev: v1.0.3
     hooks:
       - id: md2po2md
         files: ^README\.md
diff --git a/mkdocs_include_markdown_plugin/__init__.py b/mkdocs_include_markdown_plugin/__init__.py
index 9b44e07..cf59bca 100644
--- a/mkdocs_include_markdown_plugin/__init__.py
+++ b/mkdocs_include_markdown_plugin/__init__.py
@@ -1,2 +1,2 @@
 __title__ = 'mkdocs_include_markdown_plugin'
-__version__ = '3.8.1'
+__version__ = '3.9.0'
diff --git a/mkdocs_include_markdown_plugin/event.py b/mkdocs_include_markdown_plugin/event.py
index a127215..debae9d 100644
--- a/mkdocs_include_markdown_plugin/event.py
+++ b/mkdocs_include_markdown_plugin/event.py
@@ -122,6 +122,7 @@ def get_file_content(
     default_trailing_newlines,
     default_comments=CONFIG_DEFAULTS['comments'],
     cumulative_heading_offset=0,
+    build=None,
 ):
 
     def found_include_tag(match):
@@ -199,6 +200,8 @@ def found_include_tag(match):
                 f':{lineno}',
             )
             return ''
+        elif build is not None:
+            build.included_files.extend(file_paths_to_include)
 
         bool_options = {
             'preserve-includer-indent': {
@@ -312,6 +315,7 @@ def found_include_tag(match):
                 default_preserve_includer_indent,
                 default_dedent,
                 default_trailing_newlines,
+                build=build,
             )
 
             # trailing newlines right stripping
@@ -435,6 +439,8 @@ def found_include_markdown_tag(match):
                 f':{lineno}',
             )
             return ''
+        elif build is not None:
+            build.included_files.extend(file_paths_to_include)
 
         bool_options = {
             'rewrite-relative-urls': {
@@ -583,6 +589,7 @@ def found_include_markdown_tag(match):
                 default_dedent,
                 default_trailing_newlines,
                 default_comments=default_comments,
+                build=build,
             )
 
             # trailing newlines right stripping
@@ -674,6 +681,7 @@ def on_page_markdown(
     page,
     docs_dir,
     config={},
+    build=None,
 ):
     escaped_opening_tag = re.escape(
         config.get('opening_tag', CONFIG_DEFAULTS['opening_tag']),
@@ -713,4 +721,5 @@ def on_page_markdown(
         config.get('dedent', CONFIG_DEFAULTS['dedent']),
         config.get('trailing_newlines', CONFIG_DEFAULTS['trailing_newlines']),
         default_comments=config.get('comments', CONFIG_DEFAULTS['comments']),
+        build=build,
     )
diff --git a/mkdocs_include_markdown_plugin/plugin.py b/mkdocs_include_markdown_plugin/plugin.py
index 7640e35..94e41a9 100644
--- a/mkdocs_include_markdown_plugin/plugin.py
+++ b/mkdocs_include_markdown_plugin/plugin.py
@@ -6,13 +6,67 @@
 )
 
 
-class IncludeMarkdownPlugin(mkdocs.plugins.BasePlugin):
-    config_scheme = CONFIG_SCHEME
-
-    def on_page_markdown(self, markdown, page, **kwargs):
-        return _on_page_markdown(
-            markdown,
-            page,
-            kwargs['config']['docs_dir'],
-            config=self.config,
-        )
+mkdocs__version_info__ = tuple(
+    int(num) for num in mkdocs.__version__.split('.') if num.isdigit()
+)
+
+if mkdocs__version_info__ < (1, 4, 0):
+    class IncludeMarkdownPlugin(mkdocs.plugins.BasePlugin):
+        config_scheme = CONFIG_SCHEME
+
+        def on_page_markdown(self, markdown, page, **kwargs):
+            return _on_page_markdown(
+                markdown,
+                page,
+                kwargs['config']['docs_dir'],
+                config=self.config,
+                build=None,
+            )
+else:
+
+    class WatchingFiles:
+        def __init__(self):
+            self.prev_included_files = []
+            self.included_files = []
+
+    SERVER = None
+    WATCHING_FILES = None
+
+    class IncludeMarkdownPlugin(mkdocs.plugins.BasePlugin):
+        config_scheme = CONFIG_SCHEME
+
+        def _watch_included_files(self):
+            for filepath in WATCHING_FILES.prev_included_files:
+                if filepath not in WATCHING_FILES.included_files:
+                    SERVER.unwatch(filepath)
+            WATCHING_FILES.prev_included_files = (
+                WATCHING_FILES.included_files[:]
+            )
+
+            for filepath in WATCHING_FILES.included_files:
+                SERVER.watch(filepath, recursive=False)
+            WATCHING_FILES.included_files = []
+
+        def on_page_content(self, html, *args, **kwargs):
+            if SERVER:
+                self._watch_included_files()
+            return html
+
+        def on_serve(self, server, builder, **kwargs):
+            global SERVER
+            if SERVER is None:
+                SERVER = server
+                self._watch_included_files()
+
+        @mkdocs.plugins.event_priority(-100)
+        def on_page_markdown(self, markdown, page, **kwargs):
+            global WATCHING_FILES
+            if WATCHING_FILES is None:
+                WATCHING_FILES = WatchingFiles()
+            return _on_page_markdown(
+                markdown,
+                page,
+                kwargs['config']['docs_dir'],
+                config=self.config,
+                build=WATCHING_FILES,
+            )
diff --git a/setup.cfg b/setup.cfg
index ddcacf9..acc1eb7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = mkdocs_include_markdown_plugin
-version = 3.8.1
+version = 3.9.0
 description = Mkdocs Markdown includer plugin.
 long_description = file: README.md
 long_description_content_type = text/markdown
@@ -42,25 +42,16 @@ mkdocs.plugins =
 [options.extras_require]
 dev =
     bump2version==1.0.1
-    flake8==3.9.2
-    flake8-implicit-str-concat==0.2.0
-    flake8-print==4.0.0
-    isort==5.9.1
-    mdpo==0.3.61
-    mkdocs==1.3.1
-    pre-commit==2.13.0
-    pytest==6.2.5
+    mkdocs==1.4.0
+    pre-commit
+    pytest==7.1.3
     pytest-cov==3.0.0
-    pyupgrade==2.19.4
-    yamllint==1.26.1
+    tox
 test =
-    mkdocs==1.3.1
-    pytest==6.2.5
+    mkdocs==1.4.0
+    pytest==7.1.3
     pytest-cov==3.0.0
 
-[tool:pytest]
-addopts = --cov=mkdocs_include_markdown_plugin --cov-report=html --cov-config=setup.cfg
-
 [coverage:run]
 omit = mkdocs_include_markdown_plugin/plugin.py
 
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..6a3c36a
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,26 @@
+[tox]
+envlist = py3{7,8,9,10}-mkdocs{124,131,140}
+skip_missing_interpreters = true
+
+[gh-actions]
+python =
+    3.7: py37
+    3.8: py38
+    3.9: py39
+    3.10: py310
+
+[testenv]
+extras =
+    test
+deps =
+    mkdocs124: mkdocs==1.2.4
+    mkdocs131: mkdocs==1.3.1
+    mkdocs140: mkdocs==1.4.0
+commands = pytest --cov=mkdocs_include_markdown_plugin \
+             --cov-report=html \
+             --cov-config=setup.cfg \
+             {posargs}
+package = wheel
+
+[testenv:examples]
+commands = pytest tests/_test_examples.py {posargs}