Explicitly specify versions in requirements.txt
-colorlog
-sawtooth-sdk
-sawtooth-signing
-cryptography
-protobuf
-connexion
-requests
-sphinx
-sphinx-autobuild
-recommonmark
-sphinx_rtd_theme
-pyOpenSSL
\ No newline at end of file
+colorlog==3.1.4
+sawtooth-sdk==1.0.1
+sawtooth-signing==1.0.1
+cryptography==2.2.2
+protobuf==3.5.2
+connexion==1.4
+requests==2.18.4
+sphinx==1.7.4
+sphinx-autobuild==0.7.1
+sphinx_rtd_theme==0.3.1
+pyOpenSSL==17.5.0
