diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index ccf62be79..0088e5d58 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -3,7 +3,7 @@ lxml>=4.2,<4.3
 matplotlib>=2.2,<3.1
 numpy>=1.14,<1.16
 progressbar2>=3.38,<3.39
-requests>=2.19,<2.21
+requests==2.21.0
 scikit-learn>=0.19,<0.21
 scikit-image>=0.14,<0.15
 scipy>=1.1,<1.2
diff --git a/requirements/requirements_test.txt b/requirements/requirements_test.txt
index 7a187e074..081a7095f 100644
--- a/requirements/requirements_test.txt
+++ b/requirements/requirements_test.txt
@@ -4,6 +4,6 @@ pydocstyle>=2.1,<3.1
 pytest>=3.6,<4.1
 pytest-cache>=1.0,<1.1
 pytest-cov>=2.5,<2.7
-pytest-xdist>=1.22,<1.25
+pytest-xdist==1.25.0
 sphinx>=1.7,<1.9
 yapf==0.25.0