diff --git a/Gopkg.toml b/Gopkg.toml
index 337f38647b674477ecaff63ffbaffde951e289c7..ff1e5adea27c021caa8c2bb9d5b08d3b03b38457 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -25,7 +25,7 @@
 #   unused-packages = true
 
 [[constraint]]
-  branch = "master"
+  branch = "5-implement-integrity-check-of-documents"
   name = "code.vereign.com/code/restful-api"
 
 [prune]