diff --git a/docs/conf.py b/docs/conf.py
index ce1d5f1b0..5b82b3335 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -164,6 +164,7 @@ def __getattr__(cls, name):
 imgmath_latex_preamble = r'''
 \usepackage{algorithm}
 \usepackage{algorithmic}
+\usepackage{amsmath}
 \usepackage{cancel}
 
 \usepackage[verbose=true,letterpaper]{geometry}
diff --git a/docs/docs_requirements.txt b/docs/docs_requirements.txt
index be20c5396..b18726716 100644
--- a/docs/docs_requirements.txt
+++ b/docs/docs_requirements.txt
@@ -1,5 +1,5 @@
-cloudpickle==0.5.2
-gym>=0.10.8
+cloudpickle~=1.2.1
+gym~=0.15.3
 ipython
 joblib
 matplotlib
@@ -12,5 +12,5 @@ seaborn==0.8.1
 sphinx==1.5.6
 sphinx-autobuild==0.7.1       
 sphinx-rtd-theme==0.4.1 
-tensorflow>=1.8.0
+tensorflow>=1.8.0<2.0
 tqdm
\ No newline at end of file