diff --git a/src/server/FastCGIUtils.hs b/src/server/FastCGIUtils.hs
index 763eeb292..8d90c9fa7 100644
--- a/src/server/FastCGIUtils.hs
+++ b/src/server/FastCGIUtils.hs
@@ -8,7 +8,7 @@ module FastCGIUtils (initFastCGI, loopFastCGI,
                      splitBy) where
 
 import Control.Concurrent
-import Control.OldException
+import Control.Exception
 import Control.Monad
 import Data.Dynamic
 import Data.IORef
@@ -143,17 +143,19 @@ stderrToFile s = return ()
 -- * General CGI Error exception mechanism
 
 data CGIError = CGIError { cgiErrorCode :: Int, cgiErrorMessage :: String, cgiErrorText :: [String] }
-                deriving Typeable
+                deriving (Show,Typeable)
+
+instance Exception CGIError where
+  toException e = SomeException e
+  fromException (SomeException e) = cast e
 
 throwCGIError :: Int -> String -> [String] -> CGI a
-throwCGIError c m t = throwCGI $ DynException $ toDyn $ CGIError c m t
+throwCGIError c m t = throwCGI $ toException $ CGIError c m t
 
 handleCGIErrors :: CGI CGIResult -> CGI CGIResult
-handleCGIErrors x = x `catchCGI` \e -> case e of
-                                         DynException d -> case fromDynamic d of
-                                                             Nothing -> throw e
-                                                             Just (CGIError c m t) -> outputError c m t
-                                         _ -> throw e
+handleCGIErrors x = x `catchCGI` \e -> case fromException e of
+                                         Nothing -> throw e
+                                         Just (CGIError c m t) -> outputError c m t
 
 -- * General CGI and JSON stuff
 
diff --git a/src/server/gf-server.cabal b/src/server/gf-server.cabal
index 05cbebf76..cdd61d933 100644
--- a/src/server/gf-server.cabal
+++ b/src/server/gf-server.cabal
@@ -7,11 +7,12 @@ license-file: LICENSE
 synopsis: FastCGI Server for Grammatical Framework
 
 executable pgf-server
-  build-depends: base,
+  build-depends: base >= 4,
                  old-time,
                  directory,
                  filepath,
                  containers,
+                 process,
                  gf >= 3.1,
                  cgi >= 3001.1.7.0,
                  fastcgi >= 3001.0.2.1,
@@ -27,32 +28,3 @@ executable pgf-server
   ghc-options: -threaded
   if os(windows)
     ghc-options: -optl-mwindows
-
-executable morpho-server
-  build-depends: base,
-                 old-time,
-                 directory,
-                 filepath,
-                 containers,
-                 gf >= 3.1,
-                 cgi >= 3001.1.7.0,
-                 fastcgi >= 3001.0.2.1,
-                 json >= 0.3.3,
-                 utf8-string >= 0.3.1.1,
-                 bytestring,
-                 pretty,
-                 array,
-                 process,
-                 mtl,
-                 random
-  if !os(windows)
-    build-depends: unix
-  main-is: MorphoService.hs
-  other-modules:
-    FastCGIUtils
-    Cache
-    URLEncoding
-    GF.Grammar.Parser
-  hs-source-dirs: ../compiler ../runtime/haskell . ../../dist/build/autogen
-  if os(windows)
-    ghc-options: -optl-mwindows