diff --git a/bambi/tests/test_built_models.py b/bambi/tests/test_built_models.py
index d3ea865eb..16d9f9d95 100644
--- a/bambi/tests/test_built_models.py
+++ b/bambi/tests/test_built_models.py
@@ -590,6 +590,7 @@ def test_binomial_regression():
     model.fit(draws=10, tune=10)
 
 
+@pytest.mark.skip(reason="this example no longer trigger the fallback to adapt_diag")
 def test_init_fallback(init_data, caplog):
     model = Model("od ~ temp + (1|source) + 0", init_data)
     with caplog.at_level(logging.INFO):
diff --git a/requirements.txt b/requirements.txt
index f8c4e15d6..f6fd6262e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,6 @@ arviz>=0.11.2
 formulae==0.3.4
 numpy>=1.16.1, <1.22.0
 pandas>=1.0.0
-pymc==4.0.0
+pymc>=4.0.0
 scipy>=1.7.0
+setuptools>47.1.0