diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1dac31f..2e06d31 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,7 @@
 name: Test
 
+# note: when updating the matrix, make sure the `workflow_dispatch` and `generate-matrix` entries match
+
 on:
   workflow_dispatch:
     inputs:
@@ -15,13 +17,12 @@ on:
       python_version:
         type: choice
         description: Python version to test with
-        default: '3.12'
+        default: '3.13'
         options:
         - 'all'
         - '3.9'
-        - '3.10'
-        - '3.11'
-        - '3.12'
+        - '3.13t'
+        - '3.13'
         - 'pypy3.9'
         - 'pypy3.10'
       test_specification:
@@ -57,9 +58,8 @@ jobs:
         - windows-latest
       PYTHON_VERSION: |
         - '3.9'
-        - '3.10'
-        - '3.11'
-        - '3.12'
+        - '3.13t'
+        - '3.13'
         - 'pypy3.9'
         - 'pypy3.10'
     steps:
diff --git a/Contributing.md b/Contributing.md
index 8ae74f5..4a77fad 100644
--- a/Contributing.md
+++ b/Contributing.md
@@ -50,5 +50,5 @@ a PR, but generally stick to conforming to the suggested linter rules.
 2. Update `Changelog.md` to reflect the new changes.
 3. Check out the commit you want to make a release from.
 4. Run `git tag <version>` e.g. `git tag v0.1.0`.
-5. Run `git push origin <version>` e.g. `git tag v0.1.0`.
+5. Run `git push origin <version>` e.g. `git push origin v0.1.0`.
     - This will trigger the 'release' github action which will upload to PyPi.
diff --git a/tests/test_import_hook/common.py b/tests/test_import_hook/common.py
index fda11b3..375bfff 100644
--- a/tests/test_import_hook/common.py
+++ b/tests/test_import_hook/common.py
@@ -8,6 +8,7 @@
 import shutil
 import subprocess
 import sys
+import sysconfig
 import tempfile
 import time
 from collections.abc import Iterator
@@ -22,7 +23,10 @@
 
 # the CI does not have enough space to keep the outputs.
 # When running locally you may set this to False for debugging
-CLEAR_WORKSPACE = False
+CLEAR_WORKSPACE = True
+
+# https://docs.python.org/3/howto/free-threading-python.html#identifying-free-threaded-python
+IS_FREE_THREADED = sysconfig.get_config_var("Py_GIL_DISABLED")
 
 MATURIN_DIR = (script_dir / "../maturin").resolve()
 TEST_CRATES_DIR = MATURIN_DIR / "test-crates"
@@ -33,6 +37,13 @@
     "pyo3-bin",  # not imported as a python module (subprocess only)
     "workspace-inverted-order",  # this directory is not a maturin package, only the subdirectory
 }
+# these test-crates do not work with free-threaded python
+# (to verify: run `maturin develop` to install them into an appropriate virtualenv and try to run the
+# corresponding `check_installed.py` script)
+if IS_FREE_THREADED:
+    IGNORED_TEST_CRATES |= {
+        "pyo3-ffi-pure",
+    }
 
 
 IMPORT_HOOK_HEADER = """
diff --git a/tests/test_import_hook/file_importer_helpers/my_script_1.rs b/tests/test_import_hook/file_importer_helpers/my_script_1.rs
index c426d7c..2b36198 100644
--- a/tests/test_import_hook/file_importer_helpers/my_script_1.rs
+++ b/tests/test_import_hook/file_importer_helpers/my_script_1.rs
@@ -3,7 +3,7 @@ use pyo3::prelude::*;
 #[pyfunction]
 fn get_num() -> usize { 10 }
 
-#[pymodule]
+#[pymodule(gil_used = false)]
 fn my_script(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(get_num, m)?)?;
     Ok(())
diff --git a/tests/test_import_hook/file_importer_helpers/my_script_2.rs b/tests/test_import_hook/file_importer_helpers/my_script_2.rs
index f87e88d..8436598 100644
--- a/tests/test_import_hook/file_importer_helpers/my_script_2.rs
+++ b/tests/test_import_hook/file_importer_helpers/my_script_2.rs
@@ -6,7 +6,7 @@ fn get_num() -> usize { 20 }
 #[pyfunction]
 fn get_other_num() -> usize { 100 }
 
-#[pymodule]
+#[pymodule(gil_used = false)]
 fn my_script(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(get_num, m)?)?;
     m.add_function(wrap_pyfunction!(get_other_num, m)?)?;
diff --git a/tests/test_import_hook/file_importer_helpers/my_script_3.rs b/tests/test_import_hook/file_importer_helpers/my_script_3.rs
index b58dd62..3b94b05 100644
--- a/tests/test_import_hook/file_importer_helpers/my_script_3.rs
+++ b/tests/test_import_hook/file_importer_helpers/my_script_3.rs
@@ -9,7 +9,7 @@ fn get_num() -> usize {
     }
 }
 
-#[pymodule]
+#[pymodule(gil_used = false)]
 fn my_script(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(get_num, m)?)?;
     Ok(())
diff --git a/tests/test_import_hook/file_importer_helpers/reload_template.rs b/tests/test_import_hook/file_importer_helpers/reload_template.rs
index 35a7fad..fea9997 100644
--- a/tests/test_import_hook/file_importer_helpers/reload_template.rs
+++ b/tests/test_import_hook/file_importer_helpers/reload_template.rs
@@ -95,7 +95,7 @@ fn register_child_module(py: Python<'_>, parent_module: &Bound<'_, PyModule>) ->
     Ok(())
 }
 
-#[pymodule]
+#[pymodule(gil_used = false)]
 fn my_module(py: Python, m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(get_num, m)?)?;
     m.add_function(wrap_pyfunction!(get_global_num, m)?)?;
diff --git a/tests/test_import_hook/project_importer_helpers/blank-project/src/lib.rs b/tests/test_import_hook/project_importer_helpers/blank-project/src/lib.rs
index 1cee12c..3cd2f81 100644
--- a/tests/test_import_hook/project_importer_helpers/blank-project/src/lib.rs
+++ b/tests/test_import_hook/project_importer_helpers/blank-project/src/lib.rs
@@ -1,6 +1,6 @@
 use pyo3::prelude::*;
 
-#[pymodule]
+#[pymodule(gil_used = false)]
 fn blank_project(_m: &Bound<'_, PyModule>) -> PyResult<()> {
     Ok(())
 }
diff --git a/tests/test_import_hook/project_importer_helpers/my_project.rs b/tests/test_import_hook/project_importer_helpers/my_project.rs
index 18e82e8..dda92e3 100644
--- a/tests/test_import_hook/project_importer_helpers/my_project.rs
+++ b/tests/test_import_hook/project_importer_helpers/my_project.rs
@@ -10,7 +10,7 @@ fn get_num() -> usize {
     }
 }
 
-#[pymodule]
+#[pymodule(gil_used = false)]
 fn my_project(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_wrapped(wrap_pyfunction!(get_num))?;
     Ok(())
diff --git a/tests/test_import_hook/project_importer_helpers/reload_template.rs b/tests/test_import_hook/project_importer_helpers/reload_template.rs
index 03cb9af..46cd3ff 100644
--- a/tests/test_import_hook/project_importer_helpers/reload_template.rs
+++ b/tests/test_import_hook/project_importer_helpers/reload_template.rs
@@ -95,7 +95,7 @@ fn register_child_module(py: Python<'_>, parent_module: &Bound<'_, PyModule>) ->
     Ok(())
 }
 
-#[pymodule]
+#[pymodule(gil_used = false)]
 fn my_project(py: Python, m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_wrapped(wrap_pyfunction!(get_num))?;
     m.add_wrapped(wrap_pyfunction!(get_global_num))?;