1 files changed, 1 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index 4e29c5876..a8478d6ad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,7 +23,7 @@ deps=pytest
      mysql: pymysql
      mysql: mysql-connector-python
      # waiting for https://github.com/oracle/python-cx_Oracle/issues/75
-     oracle: cx_oracle>=6.0.2,!=6.3
+     oracle: cx_oracle>=6.0.2,!=6.3,!=6.4
      oracle5: cx_oracle==5.2.1
      mssql: pyodbc
      mssql: pymssql