diff --git a/flake.lock b/flake.lock
index 222dd4365..16a02d197 100644
--- a/flake.lock
+++ b/flake.lock
@@ -295,11 +295,11 @@
     "hackage": {
       "flake": false,
       "locked": {
-        "lastModified": 1705537393,
-        "narHash": "sha256-MEaafajuZWk2e2DcI0u4g+9H6eoBYfNGu8JNvDfpSz8=",
+        "lastModified": 1708993343,
+        "narHash": "sha256-8EbbR5ReQK61yP/7VYtFSCerBXSE59VtfV+Wahdsuqg=",
         "owner": "input-output-hk",
         "repo": "hackage.nix",
-        "rev": "c66ea06697f6404c27065822f21ed0d30017c2c9",
+        "rev": "f823c9258e9316cb4da256fc93e9c0407f0c296a",
         "type": "github"
       },
       "original": {
@@ -330,6 +330,7 @@
         "hpc-coveralls": "hpc-coveralls",
         "hydra": "hydra",
         "iserv-proxy": "iserv-proxy",
+        "nix-tools-static": "nix-tools-static",
         "nixpkgs": [
           "haskell-nix",
           "nixpkgs-unstable"
@@ -346,11 +347,11 @@
         "stackage": "stackage"
       },
       "locked": {
-        "lastModified": 1705539027,
-        "narHash": "sha256-wvGY2BGV4qSL/UVxPNVVQf7d+XZXg4Jmd1VgL8k/Iz8=",
+        "lastModified": 1708994988,
+        "narHash": "sha256-GQD4phMqbuEmSvUpcmTp1W9InABwuegI4EFhBOyMM8Q=",
         "owner": "input-output-hk",
         "repo": "haskell.nix",
-        "rev": "57df03d26d5af4838d675df555af3c838d356a85",
+        "rev": "edd4f75235c050c0ee476e1fe28f757b068cf465",
         "type": "github"
       },
       "original": {
@@ -587,11 +588,11 @@
     "minio-hs": {
       "flake": false,
       "locked": {
-        "lastModified": 1705540966,
-        "narHash": "sha256-qkB2KfYPZEBvSm/zZZANkbzJmuorXyG3FxpZQ1lacaw=",
+        "lastModified": 1705548354,
+        "narHash": "sha256-wuJYScDu1hGlasE4rzUEi9ouvEiQYWcHF9jRngiQ3Z4=",
         "ref": "uni2work",
-        "rev": "3dcb2765211aca4ef240fa4e89e297211f07ad6c",
-        "revCount": 222,
+        "rev": "fafc203e1bace1998264d1ce4340fb801e877b51",
+        "revCount": 223,
         "type": "git",
         "url": "https://gitlab.uniworx.de/haskell/minio-hs.git"
       },
@@ -622,6 +623,23 @@
         "type": "github"
       }
     },
+    "nix-tools-static": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1706266250,
+        "narHash": "sha256-9t+GRk3eO9muCtKdNAwBtNBZ5dH1xHcnS17WaQyftwA=",
+        "owner": "input-output-hk",
+        "repo": "haskell-nix-example",
+        "rev": "580cb6db546a7777dad3b9c0fa487a366c045c4e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "ref": "nix",
+        "repo": "haskell-nix-example",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1657693803,
@@ -856,11 +874,11 @@
     "stackage": {
       "flake": false,
       "locked": {
-        "lastModified": 1705536588,
-        "narHash": "sha256-p346EK20jmSALUlWOHBvkTFhLUa2IK28Vfunw7Es1Qg=",
+        "lastModified": 1708992583,
+        "narHash": "sha256-g9sClypeNUzEjc2aFaTyaptFc5dXt3zA3HnfRV5AN2g=",
         "owner": "input-output-hk",
         "repo": "stackage.nix",
-        "rev": "967f15b4a78ff4af2c7000fd770b088da7986230",
+        "rev": "08e1deb077c113cde815daa21683c7fbc71ee4aa",
         "type": "github"
       },
       "original": {
@@ -904,11 +922,11 @@
     "yesod": {
       "flake": false,
       "locked": {
-        "lastModified": 1625061191,
-        "narHash": "sha256-K0X2MwUStChml1DlJ7t4yBMDwrMe6j/780nJtSy9Hss=",
+        "lastModified": 1705542497,
+        "narHash": "sha256-DYri6G3LeL3Gu11K0gAcUOxMwyKrLVkNnb5oTjHKRro=",
         "ref": "uni2work",
-        "rev": "a59f63e0336ee61f7a90b8778e9147305d3127bb",
-        "revCount": 5053,
+        "rev": "9f8d26371d4760f8985e7bbe00c3ac16be1301bc",
+        "revCount": 5208,
         "type": "git",
         "url": "https://gitlab.uniworx.de/haskell/yesod.git"
       },
diff --git a/shell.nix b/shell.nix
index 7603cb73f..3775d311e 100644
--- a/shell.nix
+++ b/shell.nix
@@ -275,7 +275,10 @@ in pkgs.mkShell {
   '';
   nativeBuildInputs = [develop inDevelop killallUni2work diffRunning]
   ++ (with pkgs;
-    [ stdenv coreutils stack nodejs_21 postgresql_12 openldap exiftool expat bzip2 glibc memcached minio minio-client
+    [ stdenv coreutils stack nodejs_21 postgresql_12 openldap exiftool
+      # expat bzip2 # these two were making problems in the ghc-versionbump to GHC9
+      expat bzip2
+      glibc memcached minio minio-client
       gup reuse pre-commit
       # busybox # for print services, but interferes with build commands in develop-shell
       htop
@@ -291,5 +294,5 @@ in pkgs.mkShell {
         ;
       })
     ]
-  ) ++ (with pkgs.haskellPackages; [ yesod-bin hlint cabal-install weeder ]);
+  ) ++ (with pkgs.haskellPackages; [ yesod-bin hlint cabal-install weeder hexpat bzlib ]);
 }
diff --git a/src/Settings/WellKnownFiles/TH.hs b/src/Settings/WellKnownFiles/TH.hs
index ada0a083e..9d86f0e00 100644
--- a/src/Settings/WellKnownFiles/TH.hs
+++ b/src/Settings/WellKnownFiles/TH.hs
@@ -42,6 +42,8 @@ import Text.Blaze.Html (preEscapedToHtml)
 
 import Control.Monad.Fail
 
+import qualified Debug.Trace as Trace
+
 nWellKnownFileName :: Name
 nWellKnownFileName = mkName "WellKnownFileName"
 
@@ -77,31 +79,32 @@ mkWellKnown defLang wellKnownBase wellKnownLinks = do
                File{..} <- pure pFile
                guard $ name /= wellKnownLinks
                return $ file & _1 %~ makeRelative (wellKnownBase </> language)
-           return (Text.pack language, lContents')
+           return (Trace.trace ("### Trace language: (" ++ show language ++ ")") (Text.pack language, lContents'))
     | otherwise
-      -> fail "wellKnownBase is not a directory"
+      -> fail $ "wellKnownBase (" ++ wellKnownBase ++ ") is not a directory"
 
   fLanguages <- if
     | defLang `Set.member` Map.keysSet languageFiles
     , let languages' = Set.delete defLang $ Map.keysSet languageFiles
-      -> return $ defLang :| Set.toList languages'
+      -> return $ Trace.trace ("### fLanguages: (" ++ show languages' ++ ")") (defLang :| Set.toList languages')
     | otherwise
       -> fail "default language is missing in wellKnownBase"
 
    -- languageLinks :: Map Lang ByteString
   languageLinks <- if
     | Dir{contents} <- inputFiles
-      -> return . Map.fromList $ do
+      -- -> Trace.trace ("### Trace languageLinks (outer): (" ++ show contents ++ ")") $ return . Map.fromList $ do
+      -> Trace.trace ("### Trace languageLinks (outer): (" ++ "...show contents..." ++ ")") $ return . Map.fromList $ do
            (language, lContents) <- contents ^.. folded . $(multifocusL 2) _name id
-           Dir{} <- pure lContents
+           Dir{} <- Trace.trace ("### Trace languageLinks (inner1): (" ++ show language ++ ")") $ pure lContents
            let
              lContents' :: [ByteString]
-             lContents' = flip mapMaybe (flattenDir lContents) $ \pFile -> do
+             lContents' = Trace.traceShowId $ flip mapMaybe (flattenDir lContents) $ \pFile -> do
                File{..} <- pure pFile
                guard $ name == wellKnownLinks
                return $ file ^. _2
            c <- lContents'
-           return (Text.pack language, c)
+           return (Trace.trace ("### Trace languageLinks (inner): (" ++ show language ++ ")") (Text.pack language, c))
     | otherwise
       -> fail "wellKnownBase is not a directory"