diff --git a/continuous_integration/environment.yaml b/continuous_integration/environment.yaml
index ec5668c8e4..2698b32510 100644
--- a/continuous_integration/environment.yaml
+++ b/continuous_integration/environment.yaml
@@ -58,6 +58,7 @@ dependencies:
   - ephem
   - bokeh
   - pytest-xdist
+  - flexparser<0.4  # breaks latest pint 0.24.3. see https://github.com/hgrecco/pint/issues/1969
   - pip:
     - pytest-lazy-fixtures
     - trollsift