diff --git a/requirements.txt b/requirements.txt
index 3fd9782..d305afc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Jinja2==2.7.3
 LEPL==5.1.3
 MarkupSafe==0.23
 PasteDeploy==1.5.2
-PyYAML==3.11
+PyYAML==5.4
 Pygments==2.0.2
 Sphinx==1.3.1
 WebOb==1.4.1
@@ -15,7 +15,7 @@ cornice==1.0.0
 couchdb-schematics==1.1.1
 coverage==3.7.1
 docutils==0.12
-gevent==1.1rc5
+gevent==1.2a1
 greenlet==0.4.9
 iso8601==0.1.10
 jsonpointer==1.9
@@ -30,7 +30,7 @@ pytest==2.6.4
 python-coveralls==2.5.0
 pytz==2014.10
 repoze.lru==0.6
-requests==2.7.0
+requests==2.20
 schematics==1.1.0
 setuptools==7.0
 sh==1.11