diff --git a/requirements-py2.7.txt b/requirements-py2.7.txt
index 6a087d7..05df129 100644
--- a/requirements-py2.7.txt
+++ b/requirements-py2.7.txt
@@ -16,7 +16,7 @@ idna==2.10
     # via requests
 msgpack==1.0.2
     # via cachecontrol
-numpy==1.16.6
+numpy==1.21.0
     # via Cytomine-Python-Client (setup.py)
 opencv-python-headless==4.2.0.32
     # via Cytomine-Python-Client (setup.py)
diff --git a/requirements.txt b/requirements.txt
index 79fa0ac..a211905 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ idna==3.2
     # via requests
 msgpack==1.0.2
     # via cachecontrol
-numpy==1.21.2
+numpy==1.21.0
     # via
     #   Cytomine-Python-Client (setup.py)
     #   opencv-python-headless