diff --git a/requirements.txt b/requirements.txt
index 7dde864c7..cbe1f925b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,6 @@
-requests>=2.5.0,<=2.99999
-pymavlink>=1.1.62
-sphinx-3dr-theme>=0.0.6
-nose>=1.3.7
-psutil>=3.0.0
-mock>=1.3.0
-six>=1.9.0
-dronekit-sitl>=3.0,<=3.99999
-monotonic<1.0
+pymavlink==2.0.6
+monotonic==1.2
+nose==1.3.7
+mock==2.0.0
+dronekit-sitl==3.1.0
+sphinx-3dr-theme>=0.4.3
diff --git a/setup.py b/setup.py
index 87175b6b9..24b81c36c 100644
--- a/setup.py
+++ b/setup.py
@@ -11,8 +11,8 @@
       url='https://github.com/dronekit/dronekit-python',
       author='3D Robotics',
       install_requires=[
-          'pymavlink>=1.1.62',
-          'monotonic<1.0'
+          'pymavlink==2.0.6',
+          'monotonic==1.2'
       ],
       author_email='tim@3drobotics.com, kevinh@geeksville.com',
       classifiers=[