diff --git a/requirements.txt b/requirements.txt
index 7463eae..82ee8ff 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 numpy==1.16.3
 six==1.12.0
-sorcery
+sorcery==0.1.0
 pytest
 cloudpickle