diff --git a/scripts/appveyor.yml b/scripts/appveyor.yml
index 27b4cfc98..060db19f5 100644
--- a/scripts/appveyor.yml
+++ b/scripts/appveyor.yml
@@ -12,9 +12,9 @@ environment:
 
 install:
   # Install dependencies from pypi
-  - "%PYTHON%\\python.exe -m pip install sqlalchemy alembic chardet beautifulsoup4 Mako nose mock pyodbc psycopg2 pypiwin32 pyenchant"
+  - "%PYTHON%\\python.exe -m pip install sqlalchemy alembic chardet beautifulsoup4 Mako nose mock pyodbc==4.0.8 psycopg2 pypiwin32 pyenchant"
   # Install mysql dependency
-  - "%PYTHON%\\python.exe -m pip install http://cdn.mysql.com/Downloads/Connector-Python/mysql-connector-python-2.0.4.zip#md5=3df394d89300db95163f17c843ef49df"
+  - "%PYTHON%\\python.exe -m pip install http://cdn.mysql.com/Downloads/Connector-Python/mysql-connector-python-2.1.5.zip#md5=ce4a24cb1746c1c8f6189a97087f21c1"
   # Download and install lxml and pyicu (originally from http://www.lfd.uci.edu/~gohlke/pythonlibs/)
   - "%PYTHON%\\python.exe -m pip install https://get.openlp.org/win-sdk/lxml-3.6.4-cp34-cp34m-win32.whl"
   - "%PYTHON%\\python.exe -m pip install https://get.openlp.org/win-sdk/PyICU-1.9.5-cp34-cp34m-win32.whl"