diff --git a/requirements.txt b/requirements.txt
index 54bb55e..0180d01 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,7 @@
 # ocrd includes opencv, numpy, shapely, click
-ocrd
-keras == 2.6.0
-scikit-learn
-tensorflow-gpu == 2.6.0
-imutils
+ocrd >= 2.23.3
+scikit-learn >= 0.23.2
+tensorflow >= 2.4.0
+imutils >= 0.5.3
 matplotlib
-setuptools
+setuptools >= 50