diff --git a/requirements.txt b/requirements.txt
index 9e3ffe873dcd729ee6aa86c303ba55d23befd8e1..f2e31dbe624eabd83f221582a1e9862ccf937535 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 bob.extension
 bob.blitz
-bob.core
+bob.core > 2.1.3