diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 40c6bf80..2d55c0fa 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -14,7 +14,7 @@ build:
       - python -m pip install sphinx_rtd_theme
 
 conda:
-  environment: conda_env_no_mpi.yml
+  environment: conda_env.yml
 
 python:
   install:
diff --git a/conda_env_no_mpi.yml b/conda_env_no_mpi.yml
deleted file mode 100644
index 10b9d63f..00000000
--- a/conda_env_no_mpi.yml
+++ /dev/null
@@ -1,26 +0,0 @@
-# This file may be used to create a conda environment using:
-# $ conda env create -f <this file>
-
-name: gprMax-devel
-dependencies:
-- python>3.7
-- colorama
-- cython
-- h5py
-- jinja2
-- jupyter
-- matplotlib
-- numpy
-- pip
-- psutil
-- scipy
-
-- pip:
-  - humanize
-#  - mpi4py
-  - numpy-stl
-#  - pycuda
-#  - pyopencl
-  - terminaltables
-  - tqdm
-  - git+https://github.com/craig-warren/PyEVTK.git
diff --git a/requirements.txt b/requirements.txt
index a2300d99..87502321 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ humanize
 jinja2
 jupyter
 matplotlib
-# mpi4py
+mpi4py
 numpy<2
 numpy-stl
 pandas