diff --git a/environment.yaml b/environment.yaml
index 13b8592..6d4fecf 100644
--- a/environment.yaml
+++ b/environment.yaml
@@ -1,23 +1,28 @@
 channels:
   - conda-forge
 dependencies:
   # dependencies
   - xtensor
   - eigen
 
   # optional dependencies
   - xsimd
 
   # build tools
   - cmake
   - setuptools_scm
 
   # Python API
   - python
   - numpy
   - pyxtensor
 
   # to run tests
   - catch2
   - gmatelastic
   - gmatelastoplasticqpot
+
+  # build docs
+  - doxygen
+  - mathjax
+