diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5cf58c4..5b75e33 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -63,7 +63,7 @@ jobs:
         PYTEST_ADDOPTS: "--durations=0"
       run: |
         aiida-mock-code || true
-        pytest --cov=aiida_test_cache tests/
+        pytest -s --cov=aiida_test_cache tests/
 
     - name: Upload coverage report
       uses: codecov/codecov-action@v5
diff --git a/aiida_test_cache/archive_cache/_fixtures.py b/aiida_test_cache/archive_cache/_fixtures.py
index 6e6e7a3..9073a83 100644
--- a/aiida_test_cache/archive_cache/_fixtures.py
+++ b/aiida_test_cache/archive_cache/_fixtures.py
@@ -269,7 +269,7 @@ def mock_objects_to_hash_calcjob(self):
             if key not in self._hash_ignored_attributes and key not in self._updatable_attributes
         },
                    {
-                       entry.link_label: entry.node.base.caching.get_hash()
+                       entry.link_label: entry.node.base.caching.compute_hash()
                        for entry in self.base.links.get_incoming(
                            link_type=(LinkType.INPUT_CALC, LinkType.INPUT_WORK)
                        ) if entry.link_label not in hash_ignored_inputs
diff --git a/aiida_test_cache/archive_cache/_utils.py b/aiida_test_cache/archive_cache/_utils.py
index da23e14..9c76309 100644
--- a/aiida_test_cache/archive_cache/_utils.py
+++ b/aiida_test_cache/archive_cache/_utils.py
@@ -57,8 +57,19 @@ class MockNodeCaching(node_caching_class):  #type: ignore
             """
 
             def _get_objects_to_hash(self):
+                return self.get_objects_to_hash()
+
+            def get_objects_to_hash(self):
                 return hash_objects_func(self)
 
+            # Compatibility with aiida-core < 2.6
+            # https://github.com/aiidateam/aiida-core/pull/6347
+            def compute_hash(self):
+                try:
+                    return super().compute_hash()
+                except AttributeError:
+                    return super().get_hash()
+
         monkeypatch.setattr(node_class, "_CLS_NODE_CACHING", MockNodeCaching)
 
 
diff --git a/aiida_test_cache/mock_code/__init__.py b/aiida_test_cache/mock_code/__init__.py
index 871f467..948bb63 100644
--- a/aiida_test_cache/mock_code/__init__.py
+++ b/aiida_test_cache/mock_code/__init__.py
@@ -16,5 +16,15 @@
     "testing_config_action",
 )
 
-# ensure aiida's pytest plugin is loaded, which we rely on
-pytest_plugins = ['aiida.manage.tests.pytest_fixtures']
+# Load aiida's pytest fixtures
+# For aiida-core>=2.6 we load new fixtures which use sqlite backend.
+# WARNING: It's not clear what happens if the user later loads
+# the old fixtures as well.
+from aiida import __version__ as aiida_version
+from packaging.version import Version
+
+if Version(aiida_version) >= Version('2.6.0'):
+    aiida_core_fixtures = 'aiida.tools.pytest_fixtures'
+else:
+    aiida_core_fixtures = 'aiida.manage.tests.pytest_fixtures'
+pytest_plugins = [aiida_core_fixtures]
diff --git a/aiida_test_cache/mock_code/_fixtures.py b/aiida_test_cache/mock_code/_fixtures.py
index 92d5471..e4ee764 100644
--- a/aiida_test_cache/mock_code/_fixtures.py
+++ b/aiida_test_cache/mock_code/_fixtures.py
@@ -259,6 +259,6 @@ def _get_mock_code(
     yield _get_mock_code
 
     log_text = log_file.read_text("utf8")
-    print("AiiDA mock code logging:")
     if log_text:
+        print("AiiDA mock code logging:")
         print(log_text)
diff --git a/pyproject.toml b/pyproject.toml
index e923cda..dc5ef0a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,9 +41,10 @@ keywords = [
 urls = {Homepage = "https://aiida-testing.readthedocs.io/"}
 requires-python = ">=3.9"
 dependencies = [
-    "aiida-core>=2.1,<2.6",
+    "aiida-core>=2.1,<3",
     "pytest>=7.0",
     "voluptuous~=0.12",
+    "packaging>=21.0",
 ]
 
 [project.optional-dependencies]
diff --git a/tests/archive_cache/test_archive_cache.py b/tests/archive_cache/test_archive_cache.py
index 0f18178..aed9442 100644
--- a/tests/archive_cache/test_archive_cache.py
+++ b/tests/archive_cache/test_archive_cache.py
@@ -2,6 +2,7 @@
 Test basic usage of the mock code on examples using aiida-diff.
 """
 import os
+from pathlib import Path
 
 import pytest
 from aiida.engine import ToContext, WorkChain, run_get_node
@@ -12,6 +13,7 @@
 from aiida_test_cache.archive_cache._utils import create_node_archive, load_node_archive
 
 CALC_ENTRY_POINT = 'diff'
+CWD = Path(__file__).parent
 
 #### diff workchain for basic tests
 
@@ -44,7 +46,7 @@ def results(self):
 
 @pytest.fixture(name='check_diff_workchain')
 def check_diff_workchain_fixture():
-    """Fixture to check the correct outputs/cachgin of the Diffworkchain
+    """Fixture to check the correct outputs/caching of the Diffworkchain
     in the tests in this file"""
 
     EXPECTED_DIFF = """1,2c1
@@ -62,16 +64,16 @@ def _check_diff_workchain(res, node, should_have_used_cache=True):
 
         #Test if cache was used?
         diffjob = node.base.links.get_outgoing().get_node_by_label('CALL')
-        cache_src = diffjob.base.caching.get_cache_source()
+        assert diffjob.base.caching.is_valid_cache
 
         calc_hash = diffjob.base.caching.get_hash()
         assert calc_hash == EXPECTED_HASH, f'Hash mismatch. hashed objects: {diffjob.base.caching._get_objects_to_hash()}'
 
         #Make sure that the cache was used if it should have been
         if should_have_used_cache:
-            assert cache_src is not None
+            assert diffjob.base.caching.is_created_from_cache, "Workchain did not use cache even though it should have"
         else:
-            assert cache_src is None
+            assert not diffjob.base.caching.is_created_from_cache, "Workchain used the cache even though it shouldn't have"
 
     return _check_diff_workchain
 
@@ -79,7 +81,9 @@ def _check_diff_workchain(res, node, should_have_used_cache=True):
 #### tests
 
 
-def test_create_node_archive(mock_code_factory, generate_diff_inputs, clear_database, tmp_path):
+def test_create_node_archive(
+    aiida_profile_clean, mock_code_factory, generate_diff_inputs, tmp_path
+):
     """
     Basic test of the create node archive fixture functionality,
     runs diff workchain and creates archive, check if archive was created
@@ -88,7 +92,7 @@ def test_create_node_archive(mock_code_factory, generate_diff_inputs, clear_data
     inputs = {'diff': generate_diff_inputs()}
     mock_code = mock_code_factory(
         label='diff',
-        data_dir_abspath=os.path.join(os.path.dirname(os.path.abspath(__file__)), 'calc_data'),
+        data_dir_abspath=CWD / 'calc_data',
         entry_point=CALC_ENTRY_POINT,
         ignore_paths=('_aiidasubmit.sh', 'file*')
     )
@@ -110,7 +114,7 @@ def test_create_node_archive(mock_code_factory, generate_diff_inputs, clear_data
     assert os.path.isfile(archive_path)
 
 
-def test_load_node_archive(clear_database, absolute_archive_path):
+def test_load_node_archive(aiida_profile_clean, absolute_archive_path):
     """Basic test of the load node archive fixture functionality, check if archive is loaded"""
 
     full_archive_path = absolute_archive_path('diff_workchain.tar.gz')
@@ -124,12 +128,12 @@ def test_load_node_archive(clear_database, absolute_archive_path):
     assert n_nodes == 9
 
 
-def test_mock_hash_codes(mock_code_factory, clear_database, liberal_hash):
+def test_mock_hash_codes(aiida_profile_clean, mock_code_factory, liberal_hash):
     """test if mock of _get_objects_to_hash works for Code and Calcs"""
 
     mock_code = mock_code_factory(
         label='diff',
-        data_dir_abspath=os.path.join(os.path.dirname(os.path.abspath(__file__)), 'calc_data'),
+        data_dir_abspath=CWD / 'calc_data',
         entry_point=CALC_ENTRY_POINT,
         ignore_paths=('_aiidasubmit.sh', 'file*')
     )
@@ -138,21 +142,20 @@ def test_mock_hash_codes(mock_code_factory, clear_database, liberal_hash):
 
 
 @pytest.mark.parametrize(
-    'archive_path', [
-        os.path.join(os.path.dirname(os.path.abspath(__file__)), 'caches/test_workchain.tar.gz'),
-        'test_workchain.tar.gz'
-    ]
+    'archive_path', [CWD / 'caches/test_workchain.tar.gz', 'test_workchain.tar.gz']
 )
 def test_enable_archive_cache(
-    archive_path, aiida_local_code_factory, generate_diff_inputs, enable_archive_cache,
-    clear_database, check_diff_workchain
+    archive_path, aiida_profile_clean, aiida_code_installed, generate_diff_inputs,
+    enable_archive_cache, check_diff_workchain
 ):
     """
     Basic test of the enable_archive_cache fixture
     """
 
     inputs = {'diff': generate_diff_inputs()}
-    diff_code = aiida_local_code_factory(executable='diff', entry_point='diff')
+    diff_code = aiida_code_installed(
+        filepath_executable='diff', default_calc_job_plugin=CALC_ENTRY_POINT
+    )
     diff_code.store()
     inputs['diff']['code'] = diff_code
     with enable_archive_cache(archive_path, calculation_class=CalculationFactory(CALC_ENTRY_POINT)):
@@ -162,7 +165,7 @@ def test_enable_archive_cache(
 
 
 def test_enable_archive_cache_non_existent(
-    aiida_local_code_factory, generate_diff_inputs, enable_archive_cache, clear_database,
+    aiida_profile_clean, aiida_code_installed, generate_diff_inputs, enable_archive_cache,
     tmp_path_factory, check_diff_workchain
 ):
     """
@@ -171,7 +174,9 @@ def test_enable_archive_cache_non_existent(
     """
 
     inputs = {'diff': generate_diff_inputs()}
-    diff_code = aiida_local_code_factory(executable='diff', entry_point='diff')
+    diff_code = aiida_code_installed(
+        filepath_executable='diff', default_calc_job_plugin=CALC_ENTRY_POINT
+    )
     diff_code.store()
     inputs['diff']['code'] = diff_code
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 3ceba4a..317c90e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -2,11 +2,30 @@
 Configuration file for pytest tests of aiida-test-cache.
 """
 import pytest
+from aiida import __version__ as aiida_version
+from packaging.version import Version
 
 pytest_plugins = [
     'pytester',
 ]
 
+# Compatibility with old aiida-core fixtures
+if Version(aiida_version) < Version('2.6.0'):
+
+    @pytest.fixture
+    def aiida_profile_clean(clear_database):
+        pass
+
+    @pytest.fixture
+    def aiida_code_installed(aiida_local_code_factory):
+
+        def _code(filepath_executable, default_calc_job_plugin):
+            return aiida_local_code_factory(
+                executable=filepath_executable, entry_point=default_calc_job_plugin
+            )
+
+        return _code
+
 
 @pytest.fixture
 def generate_diff_inputs(datadir):