diff --git a/rastervision_gdal_vsi/requirements.txt b/rastervision_gdal_vsi/requirements.txt
index bdb79be30..d38137c70 100644
--- a/rastervision_gdal_vsi/requirements.txt
+++ b/rastervision_gdal_vsi/requirements.txt
@@ -1,2 +1,2 @@
 rastervision_pipeline==0.21.1
-gdal>=3.4.1<=3.6.3
+gdal>=3.4.1,<=3.6.3