diff --git a/requirements.txt b/requirements.txt
index dae0cb7..847f09a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,10 +1,16 @@
+atomicwrites==1.2.1
+attrs==18.2.0
 bleach==3.0.2
 certifi==2018.11.29
 chardet==3.0.4
 docutils==0.14
 idna==2.8
+more-itertools==5.0.0
 pkginfo==1.4.2
+pluggy==0.8.0
+py==1.7.0
 Pygments==2.3.1
+pytest==4.0.2
 readme-renderer==24.0
 requests==2.21.0
 requests-toolbelt==0.8.0