diff --git a/src/Vervis/Import/NoFoundation.hs b/src/Vervis/Import/NoFoundation.hs
index 91c745a..9fe4a48 100644
--- a/src/Vervis/Import/NoFoundation.hs
+++ b/src/Vervis/Import/NoFoundation.hs
@@ -15,7 +15,7 @@
 
 module Vervis.Import.NoFoundation ( module Import ) where
 
-import ClassyPrelude.Conduit       as Import
+import ClassyPrelude.Conduit       as Import hiding (delete, deleteBy)
 import Data.Default                as Import (Default (..))
 import Database.Persist.Sql        as Import ( SqlBackend
                                              , SqlPersistT
diff --git a/stack.yaml b/stack.yaml
index 5a4440f..b6aeee5 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -3,7 +3,7 @@
 
 # Specifies the GHC version and set of packages available (e.g., lts-3.5,
 # nightly-2015-09-21, ghc-7.10.2)
-resolver: lts-5.11
+resolver: lts-5.13
 
 # Local packages, usually specified by relative directory name
 packages: