diff --git a/requirements.txt b/requirements.txt
index c80e79291ac..530e6211daf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,5 +15,5 @@ pyclipper
 deprecation>=2.0.0
 hfutils>=0.2.3
 filelock
-bchlib>=2.1.3
+bchlib>=1.0.0,!=2.0.0,!=2.0.1,!=2.1.0,!=2.1.1,!=2.1.2
 piexif
\ No newline at end of file