diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+- 0.9.7.0
+    * Fix issue trying to kill builtin server
+    * Bump `QuickCheck` dependency to 2.9
+
 - 0.9.6.2
     * Bump `binary` dependency for GHC 8.0 compatibility
 
diff --git a/src/Network/WebSockets/Server.hs b/src/Network/WebSockets/Server.hs
--- a/src/Network/WebSockets/Server.hs
+++ b/src/Network/WebSockets/Server.hs
@@ -15,8 +15,9 @@
 
 --------------------------------------------------------------------------------
 import           Control.Concurrent            (forkIOWithUnmask)
-import           Control.Exception             (bracket, bracketOnError,
-                                                finally, throwIO, mask_)
+import           Control.Exception             (allowInterrupt, bracket,
+                                                bracketOnError, finally, mask_,
+                                                throwIO)
 import           Control.Monad                 (forever, void)
 import           Network.Socket                (Socket)
 import qualified Network.Socket                as S
@@ -60,7 +61,8 @@
   (makeListenSocket host port)
   S.sClose
   (\sock ->
-    forever $ mask_ $ do
+    mask_ $ forever $ do
+      allowInterrupt
       (conn, _) <- S.accept sock
       void $ forkIOWithUnmask $ \unmask ->
         finally (unmask $ runApp conn opts app) (S.sClose conn)
diff --git a/websockets.cabal b/websockets.cabal
--- a/websockets.cabal
+++ b/websockets.cabal
@@ -1,5 +1,5 @@
 Name:    websockets
-Version: 0.9.6.2
+Version: 0.9.7.0
 
 Synopsis:
   A sensible and clean way to write WebSocket-capable servers in Haskell.
@@ -70,7 +70,7 @@
 
   Build-depends:
     attoparsec        >= 0.10   && < 0.14,
-    base              >= 4      && < 5,
+    base              >= 4.4    && < 5,
     base64-bytestring >= 0.1    && < 1.1,
     binary            >= 0.5    && < 0.9,
     blaze-builder     >= 0.3    && < 0.5,
@@ -98,7 +98,7 @@
 
   Build-depends:
     HUnit                      >= 1.2 && < 1.4,
-    QuickCheck                 >= 2.7 && < 2.9,
+    QuickCheck                 >= 2.7 && < 2.10,
     test-framework             >= 0.4 && < 0.9,
     test-framework-hunit       >= 0.2 && < 0.4,
     test-framework-quickcheck2 >= 0.2 && < 0.4,