diff --git a/docs/requirements.txt b/docs/requirements.txt
index d2d4468fe51c98422a5c7a341ca21c2ebf5369a7..1ad8ad8ff6574d00b0f3adaefb6d61ed0f3b0991 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,16 +2,13 @@ alabaster==0.7.12
 Babel==2.7.0
 chardet==3.0.4
 docutils==0.14
-filelock==3.0.10
 idna==2.8
 imagesize==1.1.0
 Jinja2==2.10.1
 MarkupSafe==1.1.1
 packaging==19.0
-pluggy==0.8.1
-py==1.7.0
 Pygments==2.4.2
-pyparsing==2.3.1
+pyparsing==2.4.0
 pytz==2019.1
 requests==2.22.0
 six==1.12.0
@@ -23,10 +20,7 @@ sphinxcontrib-htmlhelp==1.0.2
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.2
 sphinxcontrib-serializinghtml==1.1.3
-toml==0.10.0
-tox==3.7.0
 urllib3==1.25.3
-virtualenv==16.4.1
 
 # Let it float since it is time sensitive and we hope it is completely API
 # stable.