diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1c9847e..caa0aeb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8]
+        python-version: ["3.8"]
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
@@ -38,13 +38,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.9", "3.10"]
+        python-version: ["3.9", "3.10", "3.11"]
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Get number of CPU cores
+        uses: SimenB/github-actions-cpu-cores@v1
+        id: cpu-cores
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
@@ -52,15 +55,15 @@ jobs:
           pip install -e .[dev]
       - name: Download test data
         run: python data/download_test_files.py > /dev/null
-      - name: Test with pytest
+      - name: Test with pytest (compiled)
         run: |
           PHASESPACE_EAGER=0 pytest --basetemp={envtmpdir} tests
           cd docs
-          PHASESPACE_EAGER=0 pytest --nbval-lax --ignore=.ipynb_checkpoints
+          PHASESPACE_EAGER=0 pytest --dist loadscope --nbval-lax --ignore=.ipynb_checkpoints -n${{ steps.cpu-cores.outputs.count }}
           cd ..
       - name: Test with pytest (eager mode)
         run: |
           PHASESPACE_EAGER=1 pytest --basetemp={envtmpdir} tests
           cd docs
-          PHASESPACE_EAGER=1 pytest --nbval-lax --ignore=.ipynb_checkpoints
+          PHASESPACE_EAGER=1 pytest --dist loadscope --nbval-lax --ignore=.ipynb_checkpoints -n${{ steps.cpu-cores.outputs.count }}
           cd ..
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 9ee7ca8..fa4cb54 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -24,7 +24,7 @@ repos:
       - id: check-ast
 
   - repo: https://github.com/PyCQA/docformatter
-    rev: v1.7.3
+    rev: v1.7.5
     hooks:
       - id: docformatter
         args:
@@ -52,10 +52,10 @@ repos:
       - id: isort
 
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.8.0
+    rev: v3.9.0
     hooks:
       - id: pyupgrade
-        args: [--py37-plus]
+        args: [--py38-plus]
 
   - repo: https://github.com/mgedmin/check-manifest
     rev: "0.49"
@@ -70,12 +70,12 @@ repos:
         args: ["--futures=true"]
 
   - repo: https://github.com/psf/black
-    rev: 23.3.0
+    rev: 23.7.0
     hooks:
       - id: black
 
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v3.0.0-alpha.9-for-vscode
+    rev: v3.0.0
     hooks:
       - id: prettier
 
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 83609d9..4e6e4f2 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -22,6 +22,10 @@ Requirement changes
 
 Thanks
 ------
+1.9.0 (20 Jul 2023)
+===================
+
+Add support for Python 3.11, drop support for 3.7
 
 1.8.0 (27 Jan 2023)
 ===================
diff --git a/phasespace/__init__.py b/phasespace/__init__.py
index cb74534..b24e664 100644
--- a/phasespace/__init__.py
+++ b/phasespace/__init__.py
@@ -1,10 +1,6 @@
 """Top-level package for TensorFlow PhaseSpace."""
-import sys
 
-if sys.version_info < (3, 8):
-    from importlib_metadata import PackageNotFoundError, version
-else:
-    from importlib.metadata import PackageNotFoundError, version
+from importlib.metadata import PackageNotFoundError, version
 
 try:
     __version__ = version("phasespace")
diff --git a/phasespace/fromdecay/__init__.py b/phasespace/fromdecay/__init__.py
index 2e2ab21..7bc4572 100644
--- a/phasespace/fromdecay/__init__.py
+++ b/phasespace/fromdecay/__init__.py
@@ -20,7 +20,6 @@
         file=sys.stderr,
     ) from error
 
-
 __all__ = ("GenMultiDecay",)
 
 
diff --git a/setup.cfg b/setup.cfg
index 53e6cea..cf33993 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,10 +19,10 @@ classifiers =
     Operating System :: Unix
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
     Topic :: Scientific/Engineering :: Physics
 keywords = TensorFlow, phasespace, HEP
 
@@ -31,9 +31,8 @@ packages = find:
 setup_requires =
     setuptools_scm
 install_requires =
-    tensorflow>=2.7
-    tensorflow_probability>=0.15,<=0.18
-    importlib-metadata; python_version <"3.8.0"
+    tensorflow>=2.11.0
+    tensorflow_probability>=0.19.0
 python_requires = >=3.7
 include_package_data = True
 testpaths = tests
@@ -47,8 +46,8 @@ tensorflow =
     %(tf)s
 fromdecay =
     particle >= 0.16.0
-    zfit >=0.10.0
-    zfit-physics >= 0.3
+    zfit >=0.12.0
+    zfit-physics >= 0.6
     decaylanguage >= 0.12.0     # not required but everyone using this feature will likely use DecayLanguage
 test =
     %(fromdecay)s