diff --git a/sdks/python/tox.ini b/sdks/python/tox.ini
index 2ed21c6486ec..63e197de586c 100644
--- a/sdks/python/tox.ini
+++ b/sdks/python/tox.ini
@@ -27,7 +27,7 @@ select = E3
 [testenv:py27]
 # autocomplete_test depends on nose when invoked directly.
 deps =
-  nose
+  nose==1.3.7
 commands =
   python --version
   pip install -e .[test]
@@ -43,8 +43,8 @@ passenv = TRAVIS*
 platform = linux2
 # autocomplete_test depends on nose when invoked directly.
 deps =
-  nose
-  cython
+  nose==1.3.7
+  cython==0.25.2
 whitelist_externals=find
 commands =
   python --version
@@ -61,7 +61,7 @@ passenv = TRAVIS*
 [testenv:py27gcp]
 # autocomplete_test depends on nose when invoked directly.
 deps =
-  nose
+  nose==1.3.7
 commands =
   pip install -e .[test,gcp]
   python --version
@@ -71,9 +71,9 @@ passenv = TRAVIS*
 
 [testenv:lint]
 deps=
-  nose
-  pep8
-  pylint
+  nose==1.3.7
+  pep8==1.7.0
+  pylint==1.6.5
 commands =
   pip install -e .[test]
   {toxinidir}/run_pylint.sh
@@ -81,8 +81,8 @@ passenv = TRAVIS*
 
 [testenv:docs]
 deps=
-  nose
-  Sphinx
+  nose==1.3.7
+  Sphinx==1.5.5
 commands =
   pip install -e .[test,gcp,docs]
   {toxinidir}/generate_pydoc.sh