diff --git a/environment.yml b/environment.yml
index d0a410eb2..a6349468b 100644
--- a/environment.yml
+++ b/environment.yml
@@ -9,7 +9,7 @@ dependencies:
   - sortedcollections
   - scipy
   - holoviews
-  - ipyparallel
+  - ipyparallel>=6.2.5
   - distributed
   - ipykernel>=4.8*
   - loky
diff --git a/setup.py b/setup.py
index 7a40e31f5..6f26cff50 100644
--- a/setup.py
+++ b/setup.py
@@ -51,7 +51,7 @@ def get_version_and_cmdclass(package_name):
         "pre_commit",
     ],
     "other": [
-        "ipyparallel",
+        "ipyparallel>=6.2.5",  # because of https://github.com/ipython/ipyparallel/issues/404
         "distributed",
         "loky",
         "scikit-optimize",