diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9ddbad0..d339bbe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,9 +10,9 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python 3.8
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: 3.8
     - name: Install dependencies
@@ -28,12 +28,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
       fail-fast: false
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -48,9 +48,9 @@ jobs:
     needs: [check, test]
     if: github.repository == 'Zac-HD/hypothesmith' &&  github.ref == 'refs/heads/master'
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python 3.8
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: 3.8
     - name: Install tools
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97f0b14..01fa84f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+### 0.3.3 - 2024-02-16
+- Add Python 3.12 and 3.13 to CI
+- Can now be imported on Python 3.13
+
 ### 0.3.2 - 2024-01-13
 - Performance improvements based on
   [Hypothesis 6.93.0](https://hypothesis.readthedocs.io/en/latest/changes.html#v6-93-0)
diff --git a/deps/check.txt b/deps/check.txt
index eeb656b..5662214 100644
--- a/deps/check.txt
+++ b/deps/check.txt
@@ -10,9 +10,9 @@ attrs==23.2.0
     #   hypothesis
 autoflake==2.2.1
     # via shed
-bandit==1.7.6
+bandit==1.7.7
     # via flake8-bandit
-black==23.12.1
+black==24.2.0
     # via shed
 click==8.1.7
     # via black
@@ -29,17 +29,13 @@ flake8==7.0.0
     #   flake8-docstrings
 flake8-bandit==4.1.1
     # via -r deps/check.in
-flake8-bugbear==23.12.2
+flake8-bugbear==24.2.6
     # via -r deps/check.in
 flake8-comprehensions==3.14.0
     # via -r deps/check.in
 flake8-docstrings==1.7.0
     # via -r deps/check.in
-gitdb==4.0.11
-    # via gitpython
-gitpython==3.1.41
-    # via bandit
-hypothesis==6.93.0
+hypothesis==6.98.6
     # via -r deps/check.in
 isort==5.13.2
     # via shed
@@ -64,7 +60,7 @@ pathspec==0.12.1
     # via black
 pbr==6.0.0
     # via stevedore
-platformdirs==4.1.0
+platformdirs==4.2.0
     # via black
 pycodestyle==2.11.1
     # via flake8
@@ -84,10 +80,8 @@ pyyaml==6.0.1
     #   libcst
 rich==13.7.0
     # via bandit
-shed==2023.6.1
+shed==2024.1.1
     # via -r deps/check.in
-smmap==5.0.1
-    # via gitdb
 snowballstemmer==2.2.0
     # via pydocstyle
 sortedcontainers==2.4.0
diff --git a/deps/test.txt b/deps/test.txt
index 66cc169..a41bd55 100644
--- a/deps/test.txt
+++ b/deps/test.txt
@@ -6,11 +6,11 @@
 #
 attrs==23.2.0
     # via hypothesis
-black==23.12.1
+black==24.2.0
     # via -r deps/test.in
 click==8.1.7
     # via black
-coverage[toml]==7.4.0
+coverage[toml]==7.4.1
     # via pytest-cov
 exceptiongroup==1.2.0
     # via
@@ -18,7 +18,7 @@ exceptiongroup==1.2.0
     #   pytest
 execnet==2.0.2
     # via pytest-xdist
-hypothesis[lark]==6.93.0
+hypothesis[lark]==6.98.6
     # via hypothesmith (setup.py)
 iniconfig==2.0.0
     # via pytest
@@ -38,11 +38,11 @@ parso==0.8.3
     # via -r deps/test.in
 pathspec==0.12.1
     # via black
-platformdirs==4.1.0
+platformdirs==4.2.0
     # via black
-pluggy==1.3.0
+pluggy==1.4.0
     # via pytest
-pytest==7.4.4
+pytest==8.0.0
     # via
     #   -r deps/test.in
     #   pytest-cov
diff --git a/setup.py b/setup.py
index 4fda72d..c4c81c4 100644
--- a/setup.py
+++ b/setup.py
@@ -45,6 +45,7 @@ def local_file(name: str) -> str:
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Topic :: Software Development :: Testing",
     ],
     long_description=open(README).read(),
diff --git a/src/hypothesmith/__init__.py b/src/hypothesmith/__init__.py
index 6170bd7..2ab6cde 100644
--- a/src/hypothesmith/__init__.py
+++ b/src/hypothesmith/__init__.py
@@ -3,5 +3,5 @@
 from hypothesmith.cst import from_node
 from hypothesmith.syntactic import from_grammar
 
-__version__ = "0.3.2"
+__version__ = "0.3.3"
 __all__ = ["from_grammar", "from_node"]
diff --git a/src/hypothesmith/syntactic.py b/src/hypothesmith/syntactic.py
index ad99e05..8d67681 100644
--- a/src/hypothesmith/syntactic.py
+++ b/src/hypothesmith/syntactic.py
@@ -3,8 +3,6 @@
 import ast
 import dis
 import sys
-import warnings
-from importlib.resources import read_text
 
 from hypothesis import assume, strategies as st
 from hypothesis.extra.lark import LarkStrategy
@@ -13,10 +11,16 @@
 
 # To update this grammar file, run
 # wget https://raw.githubusercontent.com/lark-parser/lark/master/lark/grammars/python.lark -O src/hypothesmith/python.lark
-with warnings.catch_warnings():
-    # `read_text()` is deprecated; I'll update once I've dropped 3.8 and earlier.
-    warnings.simplefilter("ignore")
+if sys.version_info < (3, 9):  # pragma: no cover
+    from importlib.resources import read_text
+
     LARK_GRAMMAR = read_text("hypothesmith", "python.lark")
+else:  # pragma: no cover  # not on py38, anyway
+    from importlib.resources import files
+
+    LARK_GRAMMAR = (
+        files("hypothesmith").joinpath("python.lark").read_text(encoding="utf8")
+    )
 
 COMPILE_MODES = {
     "eval_input": "eval",
diff --git a/tests/test_cst.py b/tests/test_cst.py
index 8532240..264c9da 100644
--- a/tests/test_cst.py
+++ b/tests/test_cst.py
@@ -1,5 +1,7 @@
 """Tests for the hypothesmith.cst module."""
+
 import ast
+import sys
 from inspect import isabstract
 from operator import attrgetter
 
@@ -83,6 +85,7 @@ def test_compilable_never_raises(s):
     compilable(s)
 
 
+@pytest.mark.xfail(sys.version_info >= (3, 13), reason="parso does not support 3.13")
 @given(source_code=hypothesmith.from_node())
 def test_parso_from_node(source_code):
     result = parso.parse(source_code).get_code()
diff --git a/tests/test_syntactic.py b/tests/test_syntactic.py
index eed06fd..eea1de5 100644
--- a/tests/test_syntactic.py
+++ b/tests/test_syntactic.py
@@ -1,6 +1,8 @@
 """Tests for the hypothesmith.syntactic module."""
+
 import ast
 import io
+import sys
 import tokenize
 
 import black
@@ -96,6 +98,7 @@ def test_generation_without_targeting(source_code):
     compile(source_code, filename="<string>", mode="exec")
 
 
+@pytest.mark.xfail(sys.version_info >= (3, 13), reason="parso does not support 3.13")
 @given(source_code=hypothesmith.from_grammar())
 def test_parso_from_grammar(source_code):
     result = parso.parse(source_code).get_code()
diff --git a/tests/test_version.py b/tests/test_version.py
index 9bd0d48..aab9801 100644
--- a/tests/test_version.py
+++ b/tests/test_version.py
@@ -1,4 +1,5 @@
 """Tests for the hypothesmith package metadata."""
+
 import re
 from datetime import date
 from functools import lru_cache
diff --git a/tox.ini b/tox.ini
index f422156..666b112 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ commands =
     flake8
     ; mypy --config-file=tox.ini src/hypothesmith/
 
-[testenv:test]
+[testenv:{py38-, py39-, py310-, py311-, py312-, py313-,}test]
 description = Runs pytest with posargs - `tox -e test -- -v` == `pytest -v`
 deps =
     --no-deps
@@ -24,6 +24,7 @@ commands =
 
 # Run `tox -e deps` to update pinned dependencies
 [testenv:deps]
+base_python = 3.10
 description = Updates pinned dependencies in the `deps/*.txt` files
 deps =
     pip-tools