diff --git a/requirements.txt b/requirements.txt
index 5f95a5d..465c241 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,4 @@
-calamari-ocr==1.0.1
+# XXX calamari 1.0.1 has bug (Early stopping frequency not honored #146), use
+# this git version:
+https://github.com/Calamari-OCR/calamari/archive/a4fa9d61.tar.gz
 tensorflow-gpu==2.0.0