diff --git a/hscim.cabal b/hscim.cabal
--- a/hscim.cabal
+++ b/hscim.cabal
@@ -1,6 +1,6 @@
 cabal-version:      1.12
 name:               hscim
-version:            0.4.0
+version:            0.4.0.1
 synopsis:           hscim json schema and server implementation
 description:
   The README file will answer all the questions you might have
@@ -117,6 +117,7 @@
     , uuid                 >=1.3.15  && <1.4
     , wai                  >=3.2.3   && <3.3
     , wai-extra            >=3.1.13  && <3.2
+    , warp                 >=3.3.30  && <3.4
 
   default-language:   Haskell2010