diff --git a/ci/requirements/py36.yml b/ci/requirements/py36.yml
index 820160b19cc..4d6d778f884 100644
--- a/ci/requirements/py36.yml
+++ b/ci/requirements/py36.yml
@@ -29,7 +29,7 @@ dependencies:
   - pandas
   - pint
   - pip
-  - pseudonetcdf
+  - pseudonetcdf<3.1  # FIXME https://github.com/pydata/xarray/issues/3409
   - pydap
   - pynio
   - pytest
diff --git a/ci/requirements/py37-windows.yml b/ci/requirements/py37-windows.yml
index 1d150d9f2af..78784b48f3c 100644
--- a/ci/requirements/py37-windows.yml
+++ b/ci/requirements/py37-windows.yml
@@ -29,7 +29,7 @@ dependencies:
   - pandas
   - pint
   - pip
-  - pseudonetcdf
+  - pseudonetcdf<3.1  # FIXME https://github.com/pydata/xarray/issues/3409
   - pydap
   # - pynio  # Not available on Windows
   - pytest
diff --git a/ci/requirements/py37.yml b/ci/requirements/py37.yml
index 4a7aaf7d32b..38e5db641b7 100644
--- a/ci/requirements/py37.yml
+++ b/ci/requirements/py37.yml
@@ -29,7 +29,7 @@ dependencies:
   - pandas
   - pint
   - pip
-  - pseudonetcdf
+  - pseudonetcdf<3.1  # FIXME https://github.com/pydata/xarray/issues/3409
   - pydap
   - pynio
   - pytest