diff --git a/doc/requirements.txt b/doc/requirements.txt
index fb4f275ae..6bb1fb91d 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,4 +1,5 @@
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
 sphinxcontrib-httpdomain>=1.3.0 # BSD
 sphinxcontrib-pecanwsme>=0.8.0 # Apache-2.0
 openstackdocstheme>=1.18.1 # Apache-2.0
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 47b572ecc..f33f7e8a9 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -58,7 +58,8 @@ msgpack-python==0.4.0
 munch==2.1.0
 netaddr==0.7.18
 netifaces==0.10.4
-networkx==1.10
+networkx==2.3;python_version>='3.4'
+networkx==1.10;python_version<'3.0'
 nose==1.3.7
 oauthlib==0.6.2
 openstackdocstheme==1.18.1
diff --git a/requirements.txt b/requirements.txt
index f21d2750f..7bc4eb348 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,10 +11,11 @@ dogpile.cache>=0.6.2 # BSD
 eventlet!=0.20.1,>=0.20.0 # MIT
 gnocchiclient>=3.3.1 # Apache-2.0
 Jinja2>=2.10 # BSD License (3 clause)
-jsonschema<3.0.0,>=2.6.0 # MIT
+#jsonschema>=2.6.0 # MIT
 keystonemiddleware>=4.18.0 # Apache-2.0
 mistral-lib>=0.4.0 # Apache-2.0
-networkx>=1.10 # BSD
+networkx<2.3,>=1.10;python_version<'3.0'  # BSD
+networkx>=2.3;python_version>='3.4'  # BSD
 oslo.concurrency>=3.26.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.context>=2.20.0 # Apache-2.0
@@ -65,3 +66,4 @@ WSME>=0.8.0 # MIT
 yaql>=1.1.3 # Apache 2.0 License
 tooz>=1.58.0 # Apache-2.0
 zake>=0.1.6 # Apache-2.0
+
diff --git a/test-requirements.txt b/test-requirements.txt
index c2ce4d6c3..756259725 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,7 +10,8 @@ fixtures>=3.0.0 # Apache-2.0/BSD
 keystonemiddleware>=4.18.0 # Apache-2.0
 mistral-lib>=0.4.0 # Apache-2.0
 mock>=2.0.0 # BSD
-networkx>=1.10 # BSD
+networkx<2.3,>=1.10;python_version<'3.0'  # BSD
+networkx>=2.3;python_version>='3.4'  # BSD
 nose>=1.3.7 # LGPL
 oslotest>=3.2.0 # Apache-2.0
 oslo.db>=4.27.0 # Apache-2.0