diff --git a/ci/environment-3.10.yml b/ci/environment-3.10.yml
index 7b99ec19..4678efee 100644
--- a/ci/environment-3.10.yml
+++ b/ci/environment-3.10.yml
@@ -13,6 +13,7 @@ dependencies:
   - jsonschema
   - pooch
   - pre-commit
+  - pydantic<2.0 # see https://github.com/intake/intake-esm/issues/617, https://github.com/ncar-xdev/ecgtools/issues    /161
   - pytest
   - xarray
   - pip
diff --git a/ci/environment-3.11.yml b/ci/environment-3.11.yml
index d1148d01..87da8f3d 100644
--- a/ci/environment-3.11.yml
+++ b/ci/environment-3.11.yml
@@ -13,6 +13,7 @@ dependencies:
   - jsonschema
   - pooch
   - pre-commit
+  - pydantic<2.0 # see https://github.com/intake/intake-esm/issues/617, https://github.com/ncar-xdev/ecgtools/issues/161
   - pytest
   - xarray
   - pip
diff --git a/ci/environment-3.9.yml b/ci/environment-3.9.yml
index 1e5c43a0..3e757d37 100644
--- a/ci/environment-3.9.yml
+++ b/ci/environment-3.9.yml
@@ -13,6 +13,7 @@ dependencies:
   - jsonschema
   - pooch
   - pre-commit
+  - pydantic<2.0 # see https://github.com/intake/intake-esm/issues/617, https://github.com/ncar-xdev/ecgtools/issues    /161
   - pytest
   - xarray
   - pip