diff --git a/requirements.txt b/requirements.txt
index 0c49b1b..3a1bfa3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-opencv-python-headless < 4.6  # XXX https://github.com/qurator-spk/sbb_textline_detection/issues/60
+opencv-python-headless == 4.5.1.48  # XXX https://github.com/qurator-spk/sbb_textline_detection/issues/60
 matplotlib
 seaborn
 tqdm