diff --git a/Makefile b/Makefile
index 9b648d6..789b48b 100644
--- a/Makefile
+++ b/Makefile
@@ -74,6 +74,7 @@ docker:
 
 .PHONY: prepare
 prepare: install-dep install-lint install-critic
+	@dep ensure --vendor-only
 
 .PHONY: install-dep
 install-dep: