diff --git a/requirements.txt b/requirements.txt
index 97d440981e..fe0a028f19 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ lxml>=4.2.3
 requests>=2.14.2                        # Apache-2.0
 six>=1.10.0
 xattr>=0.4;sys_platform!='win32'        # MIT
-PyECLib>=1.3.1                          # BSD
+PyECLib>=1.3.1,!=1.6.2,!=1.6.3          # BSD
 cryptography>=2.0.2                     # BSD/Apache-2.0
 
 # For python 2.7, the following requirements are needed; they are not