diff --git a/echo-master/requirements.txt b/echo-master/requirements.txt
index 2cc9aa7..38c4a89 100644
--- a/echo-master/requirements.txt
+++ b/echo-master/requirements.txt
@@ -1,6 +1,6 @@
-Flask
-Flask-RESTful
-pymongo
-pyserial
-schedule
-flask-cors
\ No newline at end of file
+Flask==1.1.2
+Flask-RESTful==0.3.8
+pymongo==3.10.1
+pyserial==3.4
+schedule==0.6.0
+flask-cors==3.0.8
\ No newline at end of file