diff --git a/requirements.txt b/requirements.txt
index 11a8239..faa7420 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,11 @@
-cython>=0.29
-numpy>=1.13
+cython
+numpy
 scipy
 six
 h5py
 lmfit
 pandas
-mdtraj<=1.8.0
+mdtraj
 MDAnalysis
 tqdm
 sphinx
diff --git a/requirements_readthedocs.txt b/requirements_readthedocs.txt
new file mode 100644
index 0000000..6048f18
--- /dev/null
+++ b/requirements_readthedocs.txt
@@ -0,0 +1,15 @@
+cython
+numpy
+scipy
+six
+h5py
+lmfit
+pandas
+MDAnalysis
+tqdm
+sphinx
+sphinx_rtd_theme
+sphinxcontrib-bibtex
+matplotlib
+nglview
+pathos