diff --git a/pyproject.toml b/pyproject.toml
index 0e641a33..f8d3651f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers = [
 dynamic = ["version"]
 dependencies = [
     "resdata",
-    "ert>=11.1.0-b1",
+    "ert>=11.1.0-b3",
     "importlib_metadata",
     "importlib_resources",
     "numpy",
diff --git a/tests/workflows/ahm_analysis/test_ahm_analysis.py b/tests/workflows/ahm_analysis/test_ahm_analysis.py
index 4db3c9e9..0aac1514 100644
--- a/tests/workflows/ahm_analysis/test_ahm_analysis.py
+++ b/tests/workflows/ahm_analysis/test_ahm_analysis.py
@@ -31,7 +31,7 @@ def test_make_update_log_df(snake_oil_facade, snapshot):
             snake_oil_facade,
             prior_ens,
             posterior_ens,
-            sorted(prior_ens.experiment.observations.keys()),
+            sorted(prior_ens.experiment.observation_keys),
             sorted(prior_ens.experiment.parameter_configuration.keys()),
         )
     snapshot.assert_match(