diff --git a/pip_requirements.txt b/pip_requirements.txt
index 6a26d82..36891a6 100644
--- a/pip_requirements.txt
+++ b/pip_requirements.txt
@@ -1,2 +1,2 @@
-Flask==0.12.2
+klein==16.12.0
 coverage==4.4.1
\ No newline at end of file