diff --git a/services/core/PlatformDriverAgent/platform_driver/interfaces/modbus_tk/requirements.txt b/services/core/PlatformDriverAgent/platform_driver/interfaces/modbus_tk/requirements.txt
index 17ed07c6b9..9d037a5053 100644
--- a/services/core/PlatformDriverAgent/platform_driver/interfaces/modbus_tk/requirements.txt
+++ b/services/core/PlatformDriverAgent/platform_driver/interfaces/modbus_tk/requirements.txt
@@ -1,3 +1,3 @@
-modbus-tk==0.5.8
-pyserial==3.4
-PyYAML==3.12
\ No newline at end of file
+modbus-tk==1.1.2
+pyserial==3.5
+PyYAML==3.12
diff --git a/services/core/PlatformDriverAgent/requirements.txt b/services/core/PlatformDriverAgent/requirements.txt
index 10290d752b..f19047e936 100644
--- a/services/core/PlatformDriverAgent/requirements.txt
+++ b/services/core/PlatformDriverAgent/requirements.txt
@@ -1,4 +1,4 @@
-bacpypes
-pymodbus
-modbus-tk
-pyserial
\ No newline at end of file
+bacpypes==0.16.7
+pymodbus==2.5.2
+modbus-tk==1.1.2
+pyserial==3.5