diff --git a/.github/workflows/antsibull-lint-tests.yml b/.github/workflows/antsibull-lint-tests.yml
index 0f3658b1..e6072a8f 100644
--- a/.github/workflows/antsibull-lint-tests.yml
+++ b/.github/workflows/antsibull-lint-tests.yml
@@ -34,11 +34,11 @@ jobs:
 
       - name: antsibull-lint collection-docs
         run: |
-          coverage run -p --source antsibull -m antsibull.cli.antsibull_lint collection-docs community.general
+          coverage run -p --source src/antsibull -m antsibull.cli.antsibull_lint collection-docs community.general
 
       - name: antsibull-lint changelog-yaml
         run: |
-          coverage run -p --source antsibull -m antsibull.cli.antsibull_lint changelog-yaml community.general/changelogs/changelog.yaml
+          coverage run -p --source src/antsibull -m antsibull.cli.antsibull_lint changelog-yaml community.general/changelogs/changelog.yaml
 
       - name: Combine and upload coverage stats
         run: |
diff --git a/.github/workflows/build-css.yml b/.github/workflows/build-css.yml
index d70e44b6..2cb839b2 100644
--- a/.github/workflows/build-css.yml
+++ b/.github/workflows/build-css.yml
@@ -31,4 +31,4 @@ jobs:
       - name: Build CSS
         run: |
           ./build.sh
-        working-directory: ./sphinx_antsibull_ext/css
+        working-directory: ./src/sphinx_antsibull_ext/css
diff --git a/.github/workflows/build-simple-docsite.yml b/.github/workflows/build-simple-docsite.yml
index 97376683..da60d24e 100644
--- a/.github/workflows/build-simple-docsite.yml
+++ b/.github/workflows/build-simple-docsite.yml
@@ -29,12 +29,12 @@ jobs:
 
       - name: Use antsibull-docs sphinx-init
         run: |
-          coverage run -p --source antsibull -m antsibull.cli.antsibull_docs sphinx-init --use-current --lenient --dest-dir .
+          coverage run -p --source src/antsibull -m antsibull.cli.antsibull_docs sphinx-init --use-current --lenient --dest-dir .
 
       - name: Patch build.sh to supply code coverage
         run: |
-          sed -i build.sh -e 's/antsibull-docs /coverage run -p --source antsibull -m antsibull.cli.antsibull_docs /g'
-          sed -i build.sh -e 's/sphinx-build /coverage run -p --source antsibull --source sphinx_antsibull_ext -m sphinx.cmd.build /g'
+          sed -i build.sh -e 's!antsibull-docs !coverage run -p --source src/antsibull -m antsibull.cli.antsibull_docs !g'
+          sed -i build.sh -e 's!sphinx-build !coverage run -p --source src/antsibull --source src/sphinx_antsibull_ext -m sphinx.cmd.build !g'
 
       - name: Install dependencies
         run: |
diff --git a/lint-flake8.sh b/lint-flake8.sh
index d43d550e..6c202824 100755
--- a/lint-flake8.sh
+++ b/lint-flake8.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
 set -e
-poetry run flake8 antsibull sphinx_antsibull_ext --count --max-complexity=10 --max-line-length=100 --statistics "$@"
+poetry run flake8 src/antsibull src/sphinx_antsibull_ext --count --max-complexity=10 --max-line-length=100 --statistics "$@"
diff --git a/lint-mypy.sh b/lint-mypy.sh
index 14df6a29..07cbdbea 100755
--- a/lint-mypy.sh
+++ b/lint-mypy.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
 set -e
-MYPYPATH=stubs/ poetry run mypy antsibull sphinx_antsibull_ext "$@"
+MYPYPATH=stubs/ poetry run mypy src/antsibull sphinx_antsibull_ext "$@"
diff --git a/lint-pylint.sh b/lint-pylint.sh
index 9aa07a0f..b48f6598 100755
--- a/lint-pylint.sh
+++ b/lint-pylint.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
 set -e
-poetry run pylint --rcfile .pylintrc.automated antsibull sphinx_antsibull_ext "$@"
+poetry run pylint --rcfile .pylintrc.automated src/antsibull sphinx_antsibull_ext "$@"
diff --git a/lint-pyre.sh b/lint-pyre.sh
index f1d40c86..72417748 100755
--- a/lint-pyre.sh
+++ b/lint-pyre.sh
@@ -3,4 +3,4 @@ set -e
 
 PURELIB=$(poetry run python -c 'from distutils.sysconfig import get_python_lib;print(get_python_lib(0))')
 PLATLIB=$(poetry run python -c 'from distutils.sysconfig import get_python_lib;print(get_python_lib(1))')
-poetry run pyre --source-directory antsibull --source-directory sphinx_antsibull_ext --search-path "$PURELIB" --search-path "$PLATLIB" --search-path stubs/ --search-path . "$@"
+poetry run pyre --source-directory src --search-path "$PURELIB" --search-path "$PLATLIB" --search-path stubs/ "$@"
diff --git a/pyproject.toml b/pyproject.toml
index aada352e..c6f2e4dd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
-requires = ["poetry>=0.12"]
-build-backend = "poetry.masonry.api"
+requires = ["poetry-core>=1.0.7"]
+build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "antsibull"
@@ -11,8 +11,8 @@ license = "GPL-3.0-or-later"
 readme = "README.md"
 repository = "https://github.com/ansible-community/antsibull"
 packages = [
-    { include = "antsibull" },
-    { include = "sphinx_antsibull_ext" },
+    { include = "antsibull", from="src" },
+    { include = "sphinx_antsibull_ext", from="src" },
     { include = "tests", format = "sdist" }
 ]
 classifiers = [
diff --git a/antsibull/__init__.py b/src/antsibull/__init__.py
similarity index 100%
rename from antsibull/__init__.py
rename to src/antsibull/__init__.py
diff --git a/antsibull/ansible_base.py b/src/antsibull/ansible_base.py
similarity index 100%
rename from antsibull/ansible_base.py
rename to src/antsibull/ansible_base.py
diff --git a/antsibull/app_context.py b/src/antsibull/app_context.py
similarity index 100%
rename from antsibull/app_context.py
rename to src/antsibull/app_context.py
diff --git a/antsibull/args.py b/src/antsibull/args.py
similarity index 100%
rename from antsibull/args.py
rename to src/antsibull/args.py
diff --git a/antsibull/augment_docs.py b/src/antsibull/augment_docs.py
similarity index 100%
rename from antsibull/augment_docs.py
rename to src/antsibull/augment_docs.py
diff --git a/antsibull/build_ansible_commands.py b/src/antsibull/build_ansible_commands.py
similarity index 100%
rename from antsibull/build_ansible_commands.py
rename to src/antsibull/build_ansible_commands.py
diff --git a/antsibull/build_changelog.py b/src/antsibull/build_changelog.py
similarity index 100%
rename from antsibull/build_changelog.py
rename to src/antsibull/build_changelog.py
diff --git a/antsibull/build_collection.py b/src/antsibull/build_collection.py
similarity index 100%
rename from antsibull/build_collection.py
rename to src/antsibull/build_collection.py
diff --git a/antsibull/changelog.py b/src/antsibull/changelog.py
similarity index 100%
rename from antsibull/changelog.py
rename to src/antsibull/changelog.py
diff --git a/antsibull/cli/__init__.py b/src/antsibull/cli/__init__.py
similarity index 100%
rename from antsibull/cli/__init__.py
rename to src/antsibull/cli/__init__.py
diff --git a/antsibull/cli/antsibull_build.py b/src/antsibull/cli/antsibull_build.py
similarity index 100%
rename from antsibull/cli/antsibull_build.py
rename to src/antsibull/cli/antsibull_build.py
diff --git a/antsibull/cli/antsibull_docs.py b/src/antsibull/cli/antsibull_docs.py
similarity index 100%
rename from antsibull/cli/antsibull_docs.py
rename to src/antsibull/cli/antsibull_docs.py
diff --git a/antsibull/cli/antsibull_lint.py b/src/antsibull/cli/antsibull_lint.py
similarity index 100%
rename from antsibull/cli/antsibull_lint.py
rename to src/antsibull/cli/antsibull_lint.py
diff --git a/antsibull/cli/doc_commands/__init__.py b/src/antsibull/cli/doc_commands/__init__.py
similarity index 100%
rename from antsibull/cli/doc_commands/__init__.py
rename to src/antsibull/cli/doc_commands/__init__.py
diff --git a/antsibull/cli/doc_commands/collection.py b/src/antsibull/cli/doc_commands/collection.py
similarity index 100%
rename from antsibull/cli/doc_commands/collection.py
rename to src/antsibull/cli/doc_commands/collection.py
diff --git a/antsibull/cli/doc_commands/current.py b/src/antsibull/cli/doc_commands/current.py
similarity index 100%
rename from antsibull/cli/doc_commands/current.py
rename to src/antsibull/cli/doc_commands/current.py
diff --git a/antsibull/cli/doc_commands/devel.py b/src/antsibull/cli/doc_commands/devel.py
similarity index 100%
rename from antsibull/cli/doc_commands/devel.py
rename to src/antsibull/cli/doc_commands/devel.py
diff --git a/antsibull/cli/doc_commands/plugin.py b/src/antsibull/cli/doc_commands/plugin.py
similarity index 100%
rename from antsibull/cli/doc_commands/plugin.py
rename to src/antsibull/cli/doc_commands/plugin.py
diff --git a/antsibull/cli/doc_commands/sphinx_init.py b/src/antsibull/cli/doc_commands/sphinx_init.py
similarity index 100%
rename from antsibull/cli/doc_commands/sphinx_init.py
rename to src/antsibull/cli/doc_commands/sphinx_init.py
diff --git a/antsibull/cli/doc_commands/stable.py b/src/antsibull/cli/doc_commands/stable.py
similarity index 100%
rename from antsibull/cli/doc_commands/stable.py
rename to src/antsibull/cli/doc_commands/stable.py
diff --git a/antsibull/collections.py b/src/antsibull/collections.py
similarity index 100%
rename from antsibull/collections.py
rename to src/antsibull/collections.py
diff --git a/antsibull/compat.py b/src/antsibull/compat.py
similarity index 100%
rename from antsibull/compat.py
rename to src/antsibull/compat.py
diff --git a/antsibull/config.py b/src/antsibull/config.py
similarity index 100%
rename from antsibull/config.py
rename to src/antsibull/config.py
diff --git a/antsibull/constants.py b/src/antsibull/constants.py
similarity index 100%
rename from antsibull/constants.py
rename to src/antsibull/constants.py
diff --git a/antsibull/data/README_md.txt b/src/antsibull/data/README_md.txt
similarity index 100%
rename from antsibull/data/README_md.txt
rename to src/antsibull/data/README_md.txt
diff --git a/antsibull/data/__init__.py b/src/antsibull/data/__init__.py
similarity index 100%
rename from antsibull/data/__init__.py
rename to src/antsibull/data/__init__.py
diff --git a/antsibull/data/ansible-readme.rst b/src/antsibull/data/ansible-readme.rst
similarity index 100%
rename from antsibull/data/ansible-readme.rst
rename to src/antsibull/data/ansible-readme.rst
diff --git a/antsibull/data/ansible-release_py.j2 b/src/antsibull/data/ansible-release_py.j2
similarity index 100%
rename from antsibull/data/ansible-release_py.j2
rename to src/antsibull/data/ansible-release_py.j2
diff --git a/antsibull/data/ansible-setup_py.j2 b/src/antsibull/data/ansible-setup_py.j2
similarity index 100%
rename from antsibull/data/ansible-setup_py.j2
rename to src/antsibull/data/ansible-setup_py.j2
diff --git a/antsibull/data/ansible_2_10_routing.yml b/src/antsibull/data/ansible_2_10_routing.yml
similarity index 100%
rename from antsibull/data/ansible_2_10_routing.yml
rename to src/antsibull/data/ansible_2_10_routing.yml
diff --git a/antsibull/data/build-ansible.sh.j2 b/src/antsibull/data/build-ansible.sh.j2
similarity index 100%
rename from antsibull/data/build-ansible.sh.j2
rename to src/antsibull/data/build-ansible.sh.j2
diff --git a/antsibull/data/collection-enum.py b/src/antsibull/data/collection-enum.py
similarity index 100%
rename from antsibull/data/collection-enum.py
rename to src/antsibull/data/collection-enum.py
diff --git a/antsibull/data/collection-readme.j2 b/src/antsibull/data/collection-readme.j2
similarity index 100%
rename from antsibull/data/collection-readme.j2
rename to src/antsibull/data/collection-readme.j2
diff --git a/antsibull/data/collection-setup_py.j2 b/src/antsibull/data/collection-setup_py.j2
similarity index 100%
rename from antsibull/data/collection-setup_py.j2
rename to src/antsibull/data/collection-setup_py.j2
diff --git a/antsibull/data/debian/changelog.j2 b/src/antsibull/data/debian/changelog.j2
similarity index 100%
rename from antsibull/data/debian/changelog.j2
rename to src/antsibull/data/debian/changelog.j2
diff --git a/antsibull/data/debian/control.j2 b/src/antsibull/data/debian/control.j2
similarity index 100%
rename from antsibull/data/debian/control.j2
rename to src/antsibull/data/debian/control.j2
diff --git a/antsibull/data/debian/copyright b/src/antsibull/data/debian/copyright
similarity index 100%
rename from antsibull/data/debian/copyright
rename to src/antsibull/data/debian/copyright
diff --git a/antsibull/data/debian/rules b/src/antsibull/data/debian/rules
similarity index 100%
rename from antsibull/data/debian/rules
rename to src/antsibull/data/debian/rules
diff --git a/antsibull/data/docsite/__init__.py b/src/antsibull/data/docsite/__init__.py
similarity index 100%
rename from antsibull/data/docsite/__init__.py
rename to src/antsibull/data/docsite/__init__.py
diff --git a/antsibull/data/docsite/list_of_collections.rst.j2 b/src/antsibull/data/docsite/list_of_collections.rst.j2
similarity index 100%
rename from antsibull/data/docsite/list_of_collections.rst.j2
rename to src/antsibull/data/docsite/list_of_collections.rst.j2
diff --git a/antsibull/data/docsite/list_of_collections_by_namespace.rst.j2 b/src/antsibull/data/docsite/list_of_collections_by_namespace.rst.j2
similarity index 100%
rename from antsibull/data/docsite/list_of_collections_by_namespace.rst.j2
rename to src/antsibull/data/docsite/list_of_collections_by_namespace.rst.j2
diff --git a/antsibull/data/docsite/list_of_plugins.rst.j2 b/src/antsibull/data/docsite/list_of_plugins.rst.j2
similarity index 100%
rename from antsibull/data/docsite/list_of_plugins.rst.j2
rename to src/antsibull/data/docsite/list_of_plugins.rst.j2
diff --git a/antsibull/data/docsite/macros/deprecates.rst.j2 b/src/antsibull/data/docsite/macros/deprecates.rst.j2
similarity index 100%
rename from antsibull/data/docsite/macros/deprecates.rst.j2
rename to src/antsibull/data/docsite/macros/deprecates.rst.j2
diff --git a/antsibull/data/docsite/plugin-deprecation.rst.j2 b/src/antsibull/data/docsite/plugin-deprecation.rst.j2
similarity index 100%
rename from antsibull/data/docsite/plugin-deprecation.rst.j2
rename to src/antsibull/data/docsite/plugin-deprecation.rst.j2
diff --git a/antsibull/data/docsite/plugin-error.rst.j2 b/src/antsibull/data/docsite/plugin-error.rst.j2
similarity index 100%
rename from antsibull/data/docsite/plugin-error.rst.j2
rename to src/antsibull/data/docsite/plugin-error.rst.j2
diff --git a/antsibull/data/docsite/plugin-redirect.rst.j2 b/src/antsibull/data/docsite/plugin-redirect.rst.j2
similarity index 100%
rename from antsibull/data/docsite/plugin-redirect.rst.j2
rename to src/antsibull/data/docsite/plugin-redirect.rst.j2
diff --git a/antsibull/data/docsite/plugin-tombstone.rst.j2 b/src/antsibull/data/docsite/plugin-tombstone.rst.j2
similarity index 100%
rename from antsibull/data/docsite/plugin-tombstone.rst.j2
rename to src/antsibull/data/docsite/plugin-tombstone.rst.j2
diff --git a/antsibull/data/docsite/plugin.rst.j2 b/src/antsibull/data/docsite/plugin.rst.j2
similarity index 100%
rename from antsibull/data/docsite/plugin.rst.j2
rename to src/antsibull/data/docsite/plugin.rst.j2
diff --git a/antsibull/data/docsite/plugins_by_collection.rst.j2 b/src/antsibull/data/docsite/plugins_by_collection.rst.j2
similarity index 100%
rename from antsibull/data/docsite/plugins_by_collection.rst.j2
rename to src/antsibull/data/docsite/plugins_by_collection.rst.j2
diff --git a/antsibull/data/docsite/role.rst.j2 b/src/antsibull/data/docsite/role.rst.j2
similarity index 100%
rename from antsibull/data/docsite/role.rst.j2
rename to src/antsibull/data/docsite/role.rst.j2
diff --git a/antsibull/data/galaxy_yml.j2 b/src/antsibull/data/galaxy_yml.j2
similarity index 100%
rename from antsibull/data/galaxy_yml.j2
rename to src/antsibull/data/galaxy_yml.j2
diff --git a/antsibull/data/gplv3.txt b/src/antsibull/data/gplv3.txt
similarity index 100%
rename from antsibull/data/gplv3.txt
rename to src/antsibull/data/gplv3.txt
diff --git a/antsibull/data/sphinx_init/_gitignore.j2 b/src/antsibull/data/sphinx_init/_gitignore.j2
similarity index 100%
rename from antsibull/data/sphinx_init/_gitignore.j2
rename to src/antsibull/data/sphinx_init/_gitignore.j2
diff --git a/antsibull/data/sphinx_init/build_sh.j2 b/src/antsibull/data/sphinx_init/build_sh.j2
similarity index 100%
rename from antsibull/data/sphinx_init/build_sh.j2
rename to src/antsibull/data/sphinx_init/build_sh.j2
diff --git a/antsibull/data/sphinx_init/conf_py.j2 b/src/antsibull/data/sphinx_init/conf_py.j2
similarity index 100%
rename from antsibull/data/sphinx_init/conf_py.j2
rename to src/antsibull/data/sphinx_init/conf_py.j2
diff --git a/antsibull/data/sphinx_init/requirements_txt.j2 b/src/antsibull/data/sphinx_init/requirements_txt.j2
similarity index 100%
rename from antsibull/data/sphinx_init/requirements_txt.j2
rename to src/antsibull/data/sphinx_init/requirements_txt.j2
diff --git a/antsibull/data/sphinx_init/rst_index_rst.j2 b/src/antsibull/data/sphinx_init/rst_index_rst.j2
similarity index 100%
rename from antsibull/data/sphinx_init/rst_index_rst.j2
rename to src/antsibull/data/sphinx_init/rst_index_rst.j2
diff --git a/antsibull/dependency_files.py b/src/antsibull/dependency_files.py
similarity index 100%
rename from antsibull/dependency_files.py
rename to src/antsibull/dependency_files.py
diff --git a/antsibull/docs_parsing/__init__.py b/src/antsibull/docs_parsing/__init__.py
similarity index 100%
rename from antsibull/docs_parsing/__init__.py
rename to src/antsibull/docs_parsing/__init__.py
diff --git a/antsibull/docs_parsing/ansible_doc.py b/src/antsibull/docs_parsing/ansible_doc.py
similarity index 100%
rename from antsibull/docs_parsing/ansible_doc.py
rename to src/antsibull/docs_parsing/ansible_doc.py
diff --git a/antsibull/docs_parsing/ansible_internal.py b/src/antsibull/docs_parsing/ansible_internal.py
similarity index 100%
rename from antsibull/docs_parsing/ansible_internal.py
rename to src/antsibull/docs_parsing/ansible_internal.py
diff --git a/antsibull/docs_parsing/fqcn.py b/src/antsibull/docs_parsing/fqcn.py
similarity index 100%
rename from antsibull/docs_parsing/fqcn.py
rename to src/antsibull/docs_parsing/fqcn.py
diff --git a/antsibull/docs_parsing/parsing.py b/src/antsibull/docs_parsing/parsing.py
similarity index 100%
rename from antsibull/docs_parsing/parsing.py
rename to src/antsibull/docs_parsing/parsing.py
diff --git a/antsibull/docs_parsing/routing.py b/src/antsibull/docs_parsing/routing.py
similarity index 100%
rename from antsibull/docs_parsing/routing.py
rename to src/antsibull/docs_parsing/routing.py
diff --git a/antsibull/extra_docs.py b/src/antsibull/extra_docs.py
similarity index 100%
rename from antsibull/extra_docs.py
rename to src/antsibull/extra_docs.py
diff --git a/antsibull/filesystem.py b/src/antsibull/filesystem.py
similarity index 100%
rename from antsibull/filesystem.py
rename to src/antsibull/filesystem.py
diff --git a/antsibull/galaxy.py b/src/antsibull/galaxy.py
similarity index 100%
rename from antsibull/galaxy.py
rename to src/antsibull/galaxy.py
diff --git a/antsibull/hashing.py b/src/antsibull/hashing.py
similarity index 100%
rename from antsibull/hashing.py
rename to src/antsibull/hashing.py
diff --git a/antsibull/jinja2/__init__.py b/src/antsibull/jinja2/__init__.py
similarity index 100%
rename from antsibull/jinja2/__init__.py
rename to src/antsibull/jinja2/__init__.py
diff --git a/antsibull/jinja2/environment.py b/src/antsibull/jinja2/environment.py
similarity index 100%
rename from antsibull/jinja2/environment.py
rename to src/antsibull/jinja2/environment.py
diff --git a/antsibull/jinja2/filters.py b/src/antsibull/jinja2/filters.py
similarity index 100%
rename from antsibull/jinja2/filters.py
rename to src/antsibull/jinja2/filters.py
diff --git a/antsibull/jinja2/tests.py b/src/antsibull/jinja2/tests.py
similarity index 100%
rename from antsibull/jinja2/tests.py
rename to src/antsibull/jinja2/tests.py
diff --git a/antsibull/lint_extra_docs.py b/src/antsibull/lint_extra_docs.py
similarity index 100%
rename from antsibull/lint_extra_docs.py
rename to src/antsibull/lint_extra_docs.py
diff --git a/antsibull/logging.py b/src/antsibull/logging.py
similarity index 100%
rename from antsibull/logging.py
rename to src/antsibull/logging.py
diff --git a/antsibull/new_ansible.py b/src/antsibull/new_ansible.py
similarity index 100%
rename from antsibull/new_ansible.py
rename to src/antsibull/new_ansible.py
diff --git a/antsibull/schemas/__init__.py b/src/antsibull/schemas/__init__.py
similarity index 100%
rename from antsibull/schemas/__init__.py
rename to src/antsibull/schemas/__init__.py
diff --git a/antsibull/schemas/ansible_doc.py b/src/antsibull/schemas/ansible_doc.py
similarity index 100%
rename from antsibull/schemas/ansible_doc.py
rename to src/antsibull/schemas/ansible_doc.py
diff --git a/antsibull/schemas/config.py b/src/antsibull/schemas/config.py
similarity index 100%
rename from antsibull/schemas/config.py
rename to src/antsibull/schemas/config.py
diff --git a/antsibull/schemas/context.py b/src/antsibull/schemas/context.py
similarity index 100%
rename from antsibull/schemas/context.py
rename to src/antsibull/schemas/context.py
diff --git a/antsibull/schemas/docs/__init__.py b/src/antsibull/schemas/docs/__init__.py
similarity index 100%
rename from antsibull/schemas/docs/__init__.py
rename to src/antsibull/schemas/docs/__init__.py
diff --git a/antsibull/schemas/docs/ansible_doc.py b/src/antsibull/schemas/docs/ansible_doc.py
similarity index 100%
rename from antsibull/schemas/docs/ansible_doc.py
rename to src/antsibull/schemas/docs/ansible_doc.py
diff --git a/antsibull/schemas/docs/base.py b/src/antsibull/schemas/docs/base.py
similarity index 100%
rename from antsibull/schemas/docs/base.py
rename to src/antsibull/schemas/docs/base.py
diff --git a/antsibull/schemas/docs/callback.py b/src/antsibull/schemas/docs/callback.py
similarity index 100%
rename from antsibull/schemas/docs/callback.py
rename to src/antsibull/schemas/docs/callback.py
diff --git a/antsibull/schemas/docs/module.py b/src/antsibull/schemas/docs/module.py
similarity index 100%
rename from antsibull/schemas/docs/module.py
rename to src/antsibull/schemas/docs/module.py
diff --git a/antsibull/schemas/docs/plugin.py b/src/antsibull/schemas/docs/plugin.py
similarity index 100%
rename from antsibull/schemas/docs/plugin.py
rename to src/antsibull/schemas/docs/plugin.py
diff --git a/antsibull/schemas/docs/role.py b/src/antsibull/schemas/docs/role.py
similarity index 100%
rename from antsibull/schemas/docs/role.py
rename to src/antsibull/schemas/docs/role.py
diff --git a/antsibull/schemas/validators.py b/src/antsibull/schemas/validators.py
similarity index 100%
rename from antsibull/schemas/validators.py
rename to src/antsibull/schemas/validators.py
diff --git a/antsibull/tarball.py b/src/antsibull/tarball.py
similarity index 100%
rename from antsibull/tarball.py
rename to src/antsibull/tarball.py
diff --git a/antsibull/utils/__init__.py b/src/antsibull/utils/__init__.py
similarity index 100%
rename from antsibull/utils/__init__.py
rename to src/antsibull/utils/__init__.py
diff --git a/antsibull/utils/collections.py b/src/antsibull/utils/collections.py
similarity index 100%
rename from antsibull/utils/collections.py
rename to src/antsibull/utils/collections.py
diff --git a/antsibull/utils/get_pkg_data.py b/src/antsibull/utils/get_pkg_data.py
similarity index 100%
rename from antsibull/utils/get_pkg_data.py
rename to src/antsibull/utils/get_pkg_data.py
diff --git a/antsibull/utils/http.py b/src/antsibull/utils/http.py
similarity index 100%
rename from antsibull/utils/http.py
rename to src/antsibull/utils/http.py
diff --git a/antsibull/utils/transformations.py b/src/antsibull/utils/transformations.py
similarity index 100%
rename from antsibull/utils/transformations.py
rename to src/antsibull/utils/transformations.py
diff --git a/antsibull/vendored/__init__.py b/src/antsibull/vendored/__init__.py
similarity index 100%
rename from antsibull/vendored/__init__.py
rename to src/antsibull/vendored/__init__.py
diff --git a/antsibull/vendored/_argparse_booleanoptionalaction.py b/src/antsibull/vendored/_argparse_booleanoptionalaction.py
similarity index 100%
rename from antsibull/vendored/_argparse_booleanoptionalaction.py
rename to src/antsibull/vendored/_argparse_booleanoptionalaction.py
diff --git a/antsibull/vendored/collections.py b/src/antsibull/vendored/collections.py
similarity index 100%
rename from antsibull/vendored/collections.py
rename to src/antsibull/vendored/collections.py
diff --git a/antsibull/vendored/json_utils.py b/src/antsibull/vendored/json_utils.py
similarity index 100%
rename from antsibull/vendored/json_utils.py
rename to src/antsibull/vendored/json_utils.py
diff --git a/antsibull/venv.py b/src/antsibull/venv.py
similarity index 100%
rename from antsibull/venv.py
rename to src/antsibull/venv.py
diff --git a/antsibull/write_docs.py b/src/antsibull/write_docs.py
similarity index 100%
rename from antsibull/write_docs.py
rename to src/antsibull/write_docs.py
diff --git a/antsibull/yaml.py b/src/antsibull/yaml.py
similarity index 100%
rename from antsibull/yaml.py
rename to src/antsibull/yaml.py
diff --git a/sphinx_antsibull_ext/__init__.py b/src/sphinx_antsibull_ext/__init__.py
similarity index 100%
rename from sphinx_antsibull_ext/__init__.py
rename to src/sphinx_antsibull_ext/__init__.py
diff --git a/sphinx_antsibull_ext/antsibull-minimal.css b/src/sphinx_antsibull_ext/antsibull-minimal.css
similarity index 100%
rename from sphinx_antsibull_ext/antsibull-minimal.css
rename to src/sphinx_antsibull_ext/antsibull-minimal.css
diff --git a/sphinx_antsibull_ext/assets.py b/src/sphinx_antsibull_ext/assets.py
similarity index 100%
rename from sphinx_antsibull_ext/assets.py
rename to src/sphinx_antsibull_ext/assets.py
diff --git a/sphinx_antsibull_ext/css/antsibull-minimal.scss b/src/sphinx_antsibull_ext/css/antsibull-minimal.scss
similarity index 100%
rename from sphinx_antsibull_ext/css/antsibull-minimal.scss
rename to src/sphinx_antsibull_ext/css/antsibull-minimal.scss
diff --git a/sphinx_antsibull_ext/css/browserslistrc b/src/sphinx_antsibull_ext/css/browserslistrc
similarity index 100%
rename from sphinx_antsibull_ext/css/browserslistrc
rename to src/sphinx_antsibull_ext/css/browserslistrc
diff --git a/sphinx_antsibull_ext/css/build.sh b/src/sphinx_antsibull_ext/css/build.sh
similarity index 100%
rename from sphinx_antsibull_ext/css/build.sh
rename to src/sphinx_antsibull_ext/css/build.sh
diff --git a/sphinx_antsibull_ext/css/cssnano.config.js b/src/sphinx_antsibull_ext/css/cssnano.config.js
similarity index 100%
rename from sphinx_antsibull_ext/css/cssnano.config.js
rename to src/sphinx_antsibull_ext/css/cssnano.config.js
diff --git a/test-pytest.sh b/test-pytest.sh
index 4b52040d..882cab9f 100755
--- a/test-pytest.sh
+++ b/test-pytest.sh
@@ -1,4 +1,4 @@
 #!/bin/sh
 set -e
-poetry run python -W 'ignore:"@coroutine" decorator is deprecated::asynctest.case' \
+PYTHONPATH=src poetry run python -W 'ignore:"@coroutine" decorator is deprecated::asynctest.case' \
 	-m pytest --cov-branch --cov=antsibull --cov=sphinx_antsibull_ext --cov-report term-missing -vv tests "$@"