diff --git a/.github/pysb-conda-env.yml b/.github/pysb-conda-env.yml
index 609b2016..c2e81313 100644
--- a/.github/pysb-conda-env.yml
+++ b/.github/pysb-conda-env.yml
@@ -4,6 +4,7 @@ channels:
   - conda-forge
 dependencies:
   - alubbock::bionetgen
+  - alubbock::nfsim==1.12.1
   - alubbock::atomizer
   - alubbock::kappa
   - numpy
diff --git a/pysb/tests/test_importers.py b/pysb/tests/test_importers.py
index e5f5b5c3..ee6fd70c 100644
--- a/pysb/tests/test_importers.py
+++ b/pysb/tests/test_importers.py
@@ -196,7 +196,8 @@ def test_bngl_import_expected_errors():
     expected_errors = {'ANx': errtype['plusminus'],
                        'CaOscillate_Sat': errtype['ratelawtype'],
                        'heise': errtype['statelabels'],
-                       'isingspin_energy': errtype['ratelawmissing'],
+                       # following model's error differs between BNG versions
+                       'isingspin_energy': f"({errtype['ratelawmissing']})|({errtype['ratelawtype']})",
                        'test_MM': errtype['ratelawtype'],
                        'test_sat': errtype['ratelawtype'],
                        }