diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f626b106..3027be5f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     name: Build
     runs-on: ubuntu-16.04
     env:
-      GOFLAGS: -mod=vendor
+      GOFLAGS: -mod=readonly
 
     services:
       postgres: