diff --git a/ci/requirements-3.4.txt b/ci/requirements-3.4.txt
index 33d3b3b4dc459..8a55c0458688e 100644
--- a/ci/requirements-3.4.txt
+++ b/ci/requirements-3.4.txt
@@ -15,5 +15,5 @@ matplotlib
 lxml
 sqlalchemy
 bottleneck
-pymysql
+pymysql==0.6.3
 psycopg2