diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 74c3c7b8..457a4e48 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -19,7 +19,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Type Checking
         run: |
-          uvx --with . mypy ptpython
+          uvx --with . mypy src/ptpython
       - name: Code formatting
         run: |
           uvx ruff check .
diff --git a/pyproject.toml b/pyproject.toml
index 3780f9d6..680d7087 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -74,11 +74,11 @@ lint.ignore = [
 [tool.ruff.lint.per-file-ignores]
 "examples/*" = ["T201"]  # Print allowed in examples.
 "examples/ptpython_config/config.py" = ["F401"]  # Unused imports in config.
-"ptpython/entry_points/run_ptipython.py" = ["T201", "F401"] # Print, import usage.
-"ptpython/entry_points/run_ptpython.py" = ["T201"]  # Print usage.
-"ptpython/ipython.py" = ["T100"]  # Import usage.
-"ptpython/repl.py" = ["T201"]  # Print usage.
-"ptpython/printer.py" = ["T201"]  # Print usage.
+"src/ptpython/entry_points/run_ptipython.py" = ["T201", "F401"] # Print, import usage.
+"src/ptpython/entry_points/run_ptpython.py" = ["T201"]  # Print usage.
+"src/ptpython/ipython.py" = ["T100"]  # Import usage.
+"src/ptpython/repl.py" = ["T201"]  # Print usage.
+"src/ptpython/printer.py" = ["T201"]  # Print usage.
 
 
 [tool.ruff.lint.isort]
diff --git a/ptpython/__init__.py b/src/ptpython/__init__.py
similarity index 100%
rename from ptpython/__init__.py
rename to src/ptpython/__init__.py
diff --git a/ptpython/__main__.py b/src/ptpython/__main__.py
similarity index 100%
rename from ptpython/__main__.py
rename to src/ptpython/__main__.py
diff --git a/ptpython/completer.py b/src/ptpython/completer.py
similarity index 100%
rename from ptpython/completer.py
rename to src/ptpython/completer.py
diff --git a/ptpython/contrib/__init__.py b/src/ptpython/contrib/__init__.py
similarity index 100%
rename from ptpython/contrib/__init__.py
rename to src/ptpython/contrib/__init__.py
diff --git a/ptpython/contrib/asyncssh_repl.py b/src/ptpython/contrib/asyncssh_repl.py
similarity index 100%
rename from ptpython/contrib/asyncssh_repl.py
rename to src/ptpython/contrib/asyncssh_repl.py
diff --git a/ptpython/entry_points/__init__.py b/src/ptpython/entry_points/__init__.py
similarity index 100%
rename from ptpython/entry_points/__init__.py
rename to src/ptpython/entry_points/__init__.py
diff --git a/ptpython/entry_points/run_ptipython.py b/src/ptpython/entry_points/run_ptipython.py
similarity index 100%
rename from ptpython/entry_points/run_ptipython.py
rename to src/ptpython/entry_points/run_ptipython.py
diff --git a/ptpython/entry_points/run_ptpython.py b/src/ptpython/entry_points/run_ptpython.py
similarity index 100%
rename from ptpython/entry_points/run_ptpython.py
rename to src/ptpython/entry_points/run_ptpython.py
diff --git a/ptpython/eventloop.py b/src/ptpython/eventloop.py
similarity index 100%
rename from ptpython/eventloop.py
rename to src/ptpython/eventloop.py
diff --git a/ptpython/filters.py b/src/ptpython/filters.py
similarity index 100%
rename from ptpython/filters.py
rename to src/ptpython/filters.py
diff --git a/ptpython/history_browser.py b/src/ptpython/history_browser.py
similarity index 100%
rename from ptpython/history_browser.py
rename to src/ptpython/history_browser.py
diff --git a/ptpython/ipython.py b/src/ptpython/ipython.py
similarity index 100%
rename from ptpython/ipython.py
rename to src/ptpython/ipython.py
diff --git a/ptpython/key_bindings.py b/src/ptpython/key_bindings.py
similarity index 100%
rename from ptpython/key_bindings.py
rename to src/ptpython/key_bindings.py
diff --git a/ptpython/layout.py b/src/ptpython/layout.py
similarity index 100%
rename from ptpython/layout.py
rename to src/ptpython/layout.py
diff --git a/ptpython/lexer.py b/src/ptpython/lexer.py
similarity index 100%
rename from ptpython/lexer.py
rename to src/ptpython/lexer.py
diff --git a/ptpython/printer.py b/src/ptpython/printer.py
similarity index 100%
rename from ptpython/printer.py
rename to src/ptpython/printer.py
diff --git a/ptpython/prompt_style.py b/src/ptpython/prompt_style.py
similarity index 100%
rename from ptpython/prompt_style.py
rename to src/ptpython/prompt_style.py
diff --git a/ptpython/py.typed b/src/ptpython/py.typed
similarity index 100%
rename from ptpython/py.typed
rename to src/ptpython/py.typed
diff --git a/ptpython/python_input.py b/src/ptpython/python_input.py
similarity index 100%
rename from ptpython/python_input.py
rename to src/ptpython/python_input.py
diff --git a/ptpython/repl.py b/src/ptpython/repl.py
similarity index 100%
rename from ptpython/repl.py
rename to src/ptpython/repl.py
diff --git a/ptpython/signatures.py b/src/ptpython/signatures.py
similarity index 100%
rename from ptpython/signatures.py
rename to src/ptpython/signatures.py
diff --git a/ptpython/style.py b/src/ptpython/style.py
similarity index 100%
rename from ptpython/style.py
rename to src/ptpython/style.py
diff --git a/ptpython/utils.py b/src/ptpython/utils.py
similarity index 100%
rename from ptpython/utils.py
rename to src/ptpython/utils.py
diff --git a/ptpython/validator.py b/src/ptpython/validator.py
similarity index 100%
rename from ptpython/validator.py
rename to src/ptpython/validator.py