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-rw-r--r--tools/optional-requires2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/optional-requires b/tools/optional-requires
index a17b1752..36c89ec0 100644
--- a/tools/optional-requires
+++ b/tools/optional-requires
@@ -1,4 +1,4 @@
-lxml # OF-Config
+lxml!=3.7.0,>=2.3 # OF-Config
ncclient # OF-Config
cryptography!=1.5.2 # Required by paramiko
paramiko # NETCONF, BGP speaker (SSH console)