diff --git a/ngraph/python/requirements.txt b/ngraph/python/requirements.txt
index 49afa45678c..42ab2c8049c 100644
--- a/ngraph/python/requirements.txt
+++ b/ngraph/python/requirements.txt
@@ -1,2 +1,2 @@
-numpy
+numpy==1.19.4
 typing; python_version < '3.6'
diff --git a/ngraph/python/requirements_test.txt b/ngraph/python/requirements_test.txt
index 81d516c9ada..3a7b5eff1dd 100644
--- a/ngraph/python/requirements_test.txt
+++ b/ngraph/python/requirements_test.txt
@@ -1,10 +1,10 @@
-flake8
-flake8-comprehensions
-flake8-docstrings
-flake8-quotes
-onnx
-pydocstyle
-pytest
-retrying
-tox
-wheel
+flake8==3.8.4
+flake8-comprehensions==3.3.0
+flake8-docstrings==1.5.0
+flake8-quotes==3.2.0
+onnx==1.7.0
+pydocstyle==5.1.1
+pytest==6.1.2
+retrying==1.3.3
+tox==3.20.1
+wheel==0.34.2