diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index fcd071c..b1e2e13 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -27,15 +27,16 @@ jobs:
       fail-fast: false
       matrix:
         config:
+          - { name: "3.12", os: ubuntu-latest, python: "3.12", r: release }
           - { name: "3.11", os: ubuntu-latest, python: "3.11", r: release }
           - { name: "3.10", os: ubuntu-latest, python: "3.10", r: release }
-          - { name: "3.9", os: ubuntu-latest, python: "3.9", r: release }
-          - { name: "3.8", os: ubuntu-latest, python: "3.8", r: oldrel }
+          - { name: "3.9", os: ubuntu-latest, python: "3.9", r: oldrel }
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          filter: blob:none
 
       - name: Install system dependencies
         if: runner.os == 'Linux'
@@ -72,6 +73,8 @@ jobs:
           packages: |
             bioc::SingleCellExperiment
             bioc::scRNAseq
+            bioc::BiocFileCache@2.10.1
+          # BiocFileCache because of https://github.com/Bioconductor/AnnotationHub/issues/46
 
       - name: Install anndata2ri
         run: |
diff --git a/pyproject.toml b/pyproject.toml
index 134eaa8..752723c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ urls.'Documentation' = 'https://icb-anndata2ri.readthedocs-hosted.com/'
 urls.'Source Code' = 'https://github.com/theislab/anndata2ri'
 urls.'Issue Tracker' = 'https://github.com/theislab/anndata2ri/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc'
 dynamic = ['version']
-requires-python = '>= 3.8'
+requires-python = '>= 3.9'
 dependencies = [
     'rpy2 >= 3.5.2',  # first with get_conversion
     'tzlocal',  # for pandas2ri
@@ -36,7 +36,6 @@ doc = [
     'sphinx>=3.0',
     'scanpydoc[theme,typehints]',
     'lxml',  # For scraping the R link info
-    'importlib_resources; python_version < "3.9"',
 ]
 
 [tool.hatch.version]
@@ -52,7 +51,7 @@ features = ['doc']
 build = 'sphinx-build -M html docs docs/_build'
 
 [[tool.hatch.envs.test.matrix]]
-python = ['3.8', '3.9', '3.10', '3.11']
+python = ['3.9', '3.10', '3.11', '3.12']
 [tool.hatch.envs.test]
 features = ['test']
 [tool.hatch.envs.test.scripts]
diff --git a/src/anndata2ri/scipy2ri/_py2r.py b/src/anndata2ri/scipy2ri/_py2r.py
index 551299a..c456305 100644
--- a/src/anndata2ri/scipy2ri/_py2r.py
+++ b/src/anndata2ri/scipy2ri/_py2r.py
@@ -1,14 +1,9 @@
 from __future__ import annotations
 
 from functools import lru_cache, wraps
+from importlib.resources import files
 from typing import TYPE_CHECKING
 
-
-try:
-    from importlib.resources import files
-except ImportError:  # Python < 3.9
-    from importlib_resources import files
-
 import numpy as np
 from rpy2.robjects import default_converter, numpy2ri
 from rpy2.robjects.conversion import localconverter
diff --git a/src/anndata2ri/scipy2ri/_support.py b/src/anndata2ri/scipy2ri/_support.py
index 75fb1b0..5460194 100644
--- a/src/anndata2ri/scipy2ri/_support.py
+++ b/src/anndata2ri/scipy2ri/_support.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from functools import lru_cache
+from functools import cache
 from typing import TYPE_CHECKING, Literal, get_args
 
 
@@ -15,7 +15,7 @@
 supported_r_matrix_storage: frozenset[SupportedMatStor] = frozenset(get_args(SupportedMatStor))
 
 
-@lru_cache(maxsize=None)
+@cache
 def supported_r_matrix_classes(
     types: Iterable[SupportedMatType] | SupportedMatType = supported_r_matrix_types,
     storage: Iterable[SupportedMatStor] | SupportedMatStor = supported_r_matrix_storage,