diff --git a/ci/requirements/environment.yml b/ci/requirements/environment.yml
index b4354b14f40..a9499694e15 100644
--- a/ci/requirements/environment.yml
+++ b/ci/requirements/environment.yml
@@ -20,6 +20,7 @@ dependencies:
   - iris
   - lxml # Optional dep of pydap
   - matplotlib-base
+  - mypy==1.15 # mypy 1.16 breaks CI
   - nc-time-axis
   - netcdf4
   - numba