diff --git a/Advanced Network Programmability/dia_1/interpreter/requirements.txt b/Advanced Network Programmability/dia_1/interpreter/requirements.txt
index c4d32217..bae56df0 100644
--- a/Advanced Network Programmability/dia_1/interpreter/requirements.txt	
+++ b/Advanced Network Programmability/dia_1/interpreter/requirements.txt	
@@ -18,7 +18,7 @@ cffi==1.11.5
 chardet==3.0.4
 cryptography==2.3.1
 idna==2.7
-lxml==4.2.5
+lxml==4.9.1
 ncclient==0.6.3
 paramiko==2.4.2
 pyang==1.7.5