diff --git a/requirements-py3.txt b/requirements-py3.txt
index b27e63db..9ac327e8 100644
--- a/requirements-py3.txt
+++ b/requirements-py3.txt
@@ -25,4 +25,4 @@ stevedore>=1.0.0
 python-crontab>=1.8.1
 tzlocal>=1.1.2
 Jinja2>=2.7.3
-PyMySQL>=0.6.2
+PyMySQL>=0.6.2,!=0.6.4
diff --git a/requirements.txt b/requirements.txt
index bf0b6fd7..494cb806 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,4 +26,4 @@ python-crontab>=1.8.1
 tzlocal>=1.1.2
 email>=4.0.2
 Jinja2>=2.7.3
-PyMySQL>=0.6.2
+PyMySQL>=0.6.2,!=0.6.4