diff --git a/test/requirements.txt b/test/requirements.txt
index 6cb2e96d..17302b22 100644
--- a/test/requirements.txt
+++ b/test/requirements.txt
@@ -1,6 +1,8 @@
 pyyaml
-flask
+Flask==1.1.4
 six
 coverage
 codecov
 mock
+itsdangerous==1.1.0
+markupsafe==1.1.1