diff --git a/optional_requirements.txt b/optional_requirements.txt
index 445cf8ee..0e27df59 100644
--- a/optional_requirements.txt
+++ b/optional_requirements.txt
@@ -10,7 +10,8 @@ SQLAlchemy==1.3.6
 Whoosh==2.7.4
 xlrd==1.2.0
 xlwt==1.3.0
-fastavro>=0.24
+fastavro>=0.24.2 ; python_version >= '3.4'
+fastavro==0.24.2 ; python_version < '3.0'
 smbprotocol>=1.0.1
 requests; python_version >= '3.4'
 fsspec>=0.7.4 ; python_version >= '3.4'