diff --git a/docs/environment.yml b/docs/environment.yml
index 50876a2..c914d37 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -9,12 +9,12 @@ dependencies:
   - nbconvert
   - netCDF4
   - pandoc
-  - pythesint>=1.6
   - python-dateutil
   - recommonmark
   - sphinx_rtd_theme
   - sphinx-autobuild
   - sphinx>=1.4
   - pip:
+    - pythesint>=1.6
     - nansat
     - nbsphinx