diff --git a/Application.hs b/Application.hs
index 266af7a..8c9e306 100644
--- a/Application.hs
+++ b/Application.hs
@@ -5,7 +5,7 @@ module Application
     , makeFoundation
     ) where
 
-import           Control.Concurrent (forkIO, threadDelay)
+import           Control.Concurrent (forkIO)
 import           Control.Exception (catch)
 import           Data.WebsiteContent
 import           Import hiding (catch)
diff --git a/Handler/BannedTags.hs b/Handler/BannedTags.hs
deleted file mode 100644
index 3139e1d..0000000
--- a/Handler/BannedTags.hs
+++ /dev/null
@@ -1,39 +0,0 @@
-module Handler.BannedTags where
-
-import Data.Slug (unSlug, Slug)
-import Data.Tag
-import Import
-
-checkSlugs :: Monad m => Textarea -> m (Either Text [Slug])
-checkSlugs (Textarea t) =
-    return $ first tshow $ (mapM mkTag $ filter (not . null) $ lines $ filter (/= '\r') t)
-
-fromSlugs :: [Slug] -> Textarea
-fromSlugs = Textarea . unlines . map unSlug
-
-getBannedTagsR :: Handler Html
-getBannedTagsR = do
-    Entity _ user <- requireAuth
-    extra <- getExtra
-    when (unSlug (userHandle user) `notMember` adminUsers extra)
-        $ permissionDenied "You are not an administrator"
-    curr <- fmap (map (bannedTagTag . entityVal))
-          $ runDB $ selectList [] [Asc BannedTagTag]
-    ((res, widget), enctype) <- runFormPost $ renderDivs
-        $ fmap (fromMaybe [])
-        $ aopt
-            (checkMMap checkSlugs fromSlugs textareaField)
-            "Banned tags (one per line)" $ Just (Just curr)
-    case res of
-        FormSuccess tags -> do
-            runDB $ do
-                deleteWhere ([] :: [Filter BannedTag])
-                insertMany_ $ map BannedTag tags
-            setMessage "Tags updated"
-            redirect BannedTagsR
-        _ -> defaultLayout $ do
-            setTitle "Banned Tags"
-            $(widgetFile "banned-tags")
-
-putBannedTagsR :: Handler Html
-putBannedTagsR = getBannedTagsR
diff --git a/Stackage/Database/Cron.hs b/Stackage/Database/Cron.hs
index 4788097..80fdf66 100644
--- a/Stackage/Database/Cron.hs
+++ b/Stackage/Database/Cron.hs
@@ -5,7 +5,6 @@ module Stackage.Database.Cron
     ) where
 
 import ClassyPrelude.Conduit
-import Control.Concurrent (threadDelay)
 import Stackage.PackageIndex.Conduit
 import Database.Persist (Entity (Entity))
 import Data.Char (isAlpha)
diff --git a/stack.yaml b/stack.yaml
index 55136c4..052062e 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-5.1
+resolver: lts-5.15
 image:
     container:
         name: fpco/stackage-server