diff --git a/.github/workflows/test_petab_test_suite.yml b/.github/workflows/test_petab_test_suite.yml
index 8d26af6109..76ecc19f8e 100644
--- a/.github/workflows/test_petab_test_suite.yml
+++ b/.github/workflows/test_petab_test_suite.yml
@@ -79,7 +79,7 @@ jobs:
         run: |
           source ./venv/bin/activate \
             && pytest --cov-report=xml:coverage.xml \
-              --cov=./ python/tests/test_*petab*.py python/tests/petab/
+              --cov=./ python/tests/test_*petab*.py python/tests/petab_/
 
       # run test models
       - name: Run PEtab test suite
diff --git a/pytest.ini b/pytest.ini
index 7aee1687bc..9c2da85f82 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -3,6 +3,8 @@
 addopts = -vv --strict-markers
 
 filterwarnings =
+    # warnings are errors
+    error
     # amici
     ignore:Conservation laws for non-constant species in models with RateRules are currently not supported and will be turned off.:UserWarning
     ignore:Conservation laws for non-constant species in models with Species-AssignmentRules are currently not supported and will be turned off.:UserWarning
diff --git a/python/sdist/amici/petab/sbml_import.py b/python/sdist/amici/petab/sbml_import.py
index 3a9ca7eaf9..92009bf7cd 100644
--- a/python/sdist/amici/petab/sbml_import.py
+++ b/python/sdist/amici/petab/sbml_import.py
@@ -90,7 +90,7 @@ def import_model_sbml(
     :return:
         The created :class:`amici.sbml_import.SbmlImporter` instance.
     """
-    from petab.models.sbml_model import SbmlModel
+    from petab.v1.models.sbml_model import SbmlModel
 
     set_log_level(logger, verbose)
 
diff --git a/python/tests/petab/test_petab_problem.py b/python/tests/petab_/test_petab_problem.py
similarity index 100%
rename from python/tests/petab/test_petab_problem.py
rename to python/tests/petab_/test_petab_problem.py
diff --git a/tests/petab_test_suite/test_petab_suite.py b/tests/petab_test_suite/test_petab_suite.py
index fee6c6d763..cf1c7d4266 100755
--- a/tests/petab_test_suite/test_petab_suite.py
+++ b/tests/petab_test_suite/test_petab_suite.py
@@ -6,7 +6,7 @@
 
 import amici
 import pandas as pd
-import petab
+import petab.v1 as petab
 import petabtests
 import pytest
 from _pytest.outcomes import Skipped