diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a3edd7e6..2425d108 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,6 +12,9 @@ jobs:
   install-linux:
     name: (Linux) Install package and run tests
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.11', '3.12']
 
     steps:
       - name: Checkout repository
@@ -20,7 +23,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: ${{ matrix.python-version }}
 
       - name: Install and test
         run: |
@@ -34,6 +37,9 @@ jobs:
   install-macos:
     name: (MacOS) Install package and run tests
     runs-on: macos-latest
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.11', '3.12']
 
     steps:
       - name: Checkout repository
@@ -42,7 +48,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: ${{ matrix.python-version }}
 
       - name: Install and test
         run: |
@@ -53,6 +59,9 @@ jobs:
   install-windows:
     name: (Windows) Install package and run tests
     runs-on: windows-latest
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.11', '3.12']
 
     steps:
       - name: Checkout repository
@@ -61,7 +70,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: ${{ matrix.python-version }}
 
       - name: Install and test
         run: |
diff --git a/pyproject.toml b/pyproject.toml
index 48a0e1f8..ca738a05 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ name = "pydrex"
 dynamic = ["version"]  # Managed by setuptools_scm.
 description = "Dynamic CPO calculations for olivine-enstatite polycrystal aggregates"
 readme = "README.md"
-requires-python = ">=3.11"  # We use tomllib: <https://docs.python.org/3/library/tomllib.html>.
+requires-python = ">=3.10"  # We use tomllib on 3.11: <https://docs.python.org/3/library/tomllib.html>.
 license = {file = "LICENSE"}
 authors = [
     {name = "Thomas Duvernay", email = "td75013@hotmail.fr"},
@@ -33,6 +33,7 @@ classifiers = [
 ]
 
 dependencies = [
+    "tomli >= 1.1.0 ; python-version < '3.11'",  # https://github.com/hukkin/tomli?tab=readme-ov-file#building-a-tomlitomllib-compatibility-layer
     "numpy >= 1.8",  # <https://numpy.org/doc/stable/reference/generated/numpy.linalg.eigvalsh.html>
     "numba >= 0.57",  # <https://numba.readthedocs.io/en/stable/release-notes.html#version-0-57-0-1-may-2023>
     "scipy >= 1.2",  # <https://github.com/scipy/scipy/pull/9176>
diff --git a/src/pydrex/io.py b/src/pydrex/io.py
index e85da3a0..f07d3295 100644
--- a/src/pydrex/io.py
+++ b/src/pydrex/io.py
@@ -19,7 +19,13 @@
 import io
 import os
 import pathlib
-import tomllib
+import sys
+
+if sys.version_info >= (3, 11):
+    import tomllib
+else:
+    import tomli as tomllib
+
 from importlib.resources import files
 
 import h5py