diff --git a/environment.yml b/environment.yml
index 2d6f2b471e0de3751e44395ce61f22463df92b0e..aa0bbe23a4f2caf6e6f099f9f4989a590b6a7098 100644
--- a/environment.yml
+++ b/environment.yml
@@ -4,7 +4,6 @@ channels:
   - conda-forge
   - bioconda
 dependencies:
-  - ipython
   - scipy
   - seaborn
   - biopython
@@ -13,7 +12,6 @@ dependencies:
   - simupop
   - scikit-learn
   - numba
-  - cython
   - dendropy
   - reportlab
   - rpy2