diff --git a/CHANGES.txt b/CHANGES.txt
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,8 @@
 Changelog for Hoogle (* = breaking change)
 
+5.0.17.14, released 2020-01-08
+    #334, allow haskell-src-exts-1.23
+    #333, disable Aelve Codesearch links
 5.0.17.13, released 2019-12-07
     #331, make --count work with --json
     #332, support ?q= as well as ?hoogle= (since it used to be q)
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright Neil Mitchell 2004-2019.
+Copyright Neil Mitchell 2004-2020.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/hoogle.cabal b/hoogle.cabal
--- a/hoogle.cabal
+++ b/hoogle.cabal
@@ -1,13 +1,13 @@
 cabal-version:      >= 1.18
 build-type:         Simple
 name:               hoogle
-version:            5.0.17.13
+version:            5.0.17.14
 license:            BSD3
 license-file:       LICENSE
 category:           Development
 author:             Neil Mitchell <ndmitchell@gmail.com>
 maintainer:         Neil Mitchell <ndmitchell@gmail.com>
-copyright:          Neil Mitchell 2004-2019
+copyright:          Neil Mitchell 2004-2020
 synopsis:           Haskell API Search
 description:
     Hoogle is a Haskell API search engine, which allows you to
@@ -61,7 +61,7 @@
         foundation >= 0.0.13,
         old-locale,
         hashable,
-        haskell-src-exts >= 1.22 && < 1.23,
+        haskell-src-exts >= 1.22 && < 1.24,
         http-conduit >= 2.3,
         http-types,
         js-flot,
diff --git a/html/index.html b/html/index.html
--- a/html/index.html
+++ b/html/index.html
@@ -33,6 +33,6 @@
 <div id="body">
 #{body}
         </div>
-        <div id="footer">&copy; <a href="http://ndmitchell.com">Neil Mitchell</a> 2004-2019, version #{version}</div>
+        <div id="footer">&copy; <a href="http://ndmitchell.com">Neil Mitchell</a> 2004-2020, version #{version}</div>
     </body>
 </html>
diff --git a/src/Action/Server.hs b/src/Action/Server.hs
--- a/src/Action/Server.hs
+++ b/src/Action/Server.hs
@@ -19,7 +19,7 @@
 import Data.Version
 import Paths_hoogle
 import Data.Maybe
-import Control.Monad
+import Control.Monad.Extra
 import Text.Read
 import System.IO.Extra
 import General.Str
@@ -194,18 +194,16 @@
             H.div ! H.class_ "ans" $ do
                 H.a ! H.href (H.stringValue $ showURL local haddock targetURL) $
                     displayItem query targetItem
-                when links $ do
-                    H.div ! H.class_ "links" $ H.a ! H.href (H.stringValue $ useLink is) $ "Uses"
+                when links $
+                    whenJust (useLink is) $ \link ->
+                        H.div ! H.class_ "links" $ H.a ! H.href (H.stringValue link) $ "Uses"
             H.div ! H.class_ "from" $ showFroms local haddock is
             H.div ! H.class_ "doc newline shut" $ H.preEscapedString targetDocs
     where
-        useLink :: [Target] -> String
+        useLink :: [Target] -> Maybe String
         useLink [t] | isNothing $ targetPackage t =
-            "https://packdeps.haskellers.com/reverse/" ++ extractName (targetItem t)
-        useLink ts@(t:_) =
-            "https://codesearch.aelve.com/haskell/search?query=" ++ escapeURL (extractName $ targetItem t) ++
-            "&filter=" ++ intercalate "|" (mapMaybe (fmap fst . targetModule) ts) ++
-            "&precise=on"
+            Just $ "https://packdeps.haskellers.com/reverse/" ++ extractName (targetItem t)
+        useLink _ = Nothing
 
         add x = ("?" ++) $ intercalate "&" $ map (joinPair "=") $
             case break ((==) "hoogle" . fst) args of