diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 75a91fccb..29869655c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.11']
+        python-version: ['3.10', '3.12']
 
     steps:
     - name: Check out repository
@@ -63,7 +63,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        python-version: ['3.11']
+        python-version: ['3.12']
 
     steps:
     - name: Check out repository
@@ -99,7 +99,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        python-version: ['3.11']
+        python-version: ['3.12']
 
     steps:
     - name: Check out repository
@@ -132,7 +132,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.11']
+        python-version: ['3.10', '3.12']
 
     steps:
     - name: Check out repository
@@ -171,7 +171,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.11']
+        python-version: ['3.10', '3.12']
 
     # needed to allow julia-actions/cache to delete old caches that it has created
     permissions:
@@ -225,8 +225,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        # ipopt does not work on 3.9 (https://github.com/mechmotum/cyipopt/issues/225)
-        python-version: ['3.11']
+        python-version: ['3.12']
 
     steps:
     - name: Check out repository
@@ -262,7 +261,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.11']
+        python-version: ['3.10', '3.12']
 
     steps:
     - name: Check out repository
@@ -298,7 +297,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.11']
+        python-version: ['3.10', '3.12']
 
     steps:
     - name: Check out repository
@@ -334,7 +333,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.11']
+        python-version: ['3.12']
 
     steps:
     - name: Check out repository
@@ -399,7 +398,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9']
+        python-version: ['3.10']
 
     steps:
     - name: Check out repository
@@ -429,7 +428,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9']
+        python-version: ['3.10']
 
     steps:
     - name: Check out repository
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 4cb46a6e3..e1ed397bb 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9']
+        python-version: ['3.12']
 
     steps:
     - name: Check out repository
diff --git a/setup.cfg b/setup.cfg
index e5d201411..4d94bb3b7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,9 +33,9 @@ classifiers =
     License :: OSI Approved :: BSD License
     Operating System :: OS Independent
     Programming Language :: Python
+    Programming Language :: Python :: 3.12
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.10
-    Programming Language :: Python :: 3.9
 keywords =
     parameter inference
     optimization
@@ -58,7 +58,7 @@ install_requires =
     tqdm >= 4.46.0
     tabulate >= 0.8.10
 
-python_requires = >=3.9
+python_requires = >=3.10
 include_package_data = True
 
 # Where is my code
diff --git a/test/base/test_objective.py b/test/base/test_objective.py
index d2c556927..998a1f0af 100644
--- a/test/base/test_objective.py
+++ b/test/base/test_objective.py
@@ -2,6 +2,7 @@
 
 import copy
 import numbers
+import sys
 from functools import partial
 
 import numpy as np
@@ -12,6 +13,11 @@
 
 from ..util import CRProblem, poly_for_sensi, rosen_for_sensi
 
+pytest_skip_aesara = pytest.mark.skipif(
+    sys.version_info >= (3, 12),
+    reason="Skipped Aesara tests on Python 3.12 or higher",
+)
+
 
 @pytest.fixture(params=[True, False])
 def integrated(request):
@@ -178,6 +184,7 @@ def rel_err(eps_):
     )
 
 
+@pytest_skip_aesara
 def test_aesara(max_sensi_order, integrated):
     """Test function composition and gradient computation via aesara"""
     import aesara.tensor as aet