diff --git a/environment.devenv.yml b/environment.devenv.yml
index 8a78d704..de0eeda9 100644
--- a/environment.devenv.yml
+++ b/environment.devenv.yml
@@ -15,6 +15,8 @@ environment:
 dependencies:
   - python ={{ PYTHON_VERSION }}
 
+  - more-itertools <10.0.0  # [PYTHON_VERSION == '3.7']
+
   {% if TEST_QMXGRAPH %}
   - cherrypy >=18.0.0
   - pytest-mock