diff --git a/requirements.txt b/requirements.txt
index 25e8676..15f7efa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,5 +9,5 @@ ocrd >= 2.20.1
 attrs
 multimethod == 1.3  # latest version to officially support Python 3.5
 tqdm
-rapidfuzz >= 2.0.5
+rapidfuzz >= 2.0.5, < 2.1.0
 six  # XXX workaround OCR-D/core#730