diff --git a/python/requirements.txt b/python/requirements.txt
index 13a1c9a9d638daf6a78f52d9d66fcf3f15b74c37..6616cca8a5c611dcd66d04da823ac2a1c3a9b3c8 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -2,7 +2,7 @@ requests>=2.20.0
 numpy>=1.12, <=1.16.4 ; python_version<"3.5"
 numpy>=1.12 ; python_version>="3.5"
 protobuf>=3.1.0
-gast>=0.3.3
+gast==0.3.3
 matplotlib<=2.2.4 ; python_version<"3.6"
 scipy>=0.19.0, <=1.2.1 ; python_version<"3.5"
 nltk>=3.2.2, <=3.4 ; python_version<"3.5"