diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -3,5 +3,3 @@
 # hinterface - Haskell / Erlang interoperability library
 
 Inspired by Jinterface (Java), a set of tools for communication with Erlang processes.
-
-This is work in progress, the library isn't usable yet.
diff --git a/erl_echo.escript b/erl_echo.escript
deleted file mode 100644
--- a/erl_echo.escript
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/usr/bin/env escript
-%% -*- erlang -*-
-%%! -smp enable -name erl@localhost.localdomain -setcookie cookie
-
--mode(compile).
-
-loop(N) ->
-    receive
-        A = {Pid, Ref, Port, Tuple, Msg} ->
-            io:format("Received ~p~n", [A]),
-            Pid ! {Pid, Ref, Port, Tuple, self(), make_ref(), [1|2], <<>>, <<"X">>, <<256:16>>, #{}, #{key => "value"}, 3.14, lists:concat(["echo: ", Msg, " (", N, ")"])};
-        {Pid, Other} -> Pid ! Other
-    end,
-    loop(N + 1).
-
-main(_) ->
-    register(echo, self()),
-    loop(0).
diff --git a/erl_hay.escript b/erl_hay.escript
deleted file mode 100644
--- a/erl_hay.escript
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/usr/bin/env escript
-%% -*- erlang -*-
-%%! -smp enable -name erl2@localhost.localdomain -setcookie cookie
-
--mode(compile).
-
-loop(N = 1000000) ->
-    {hay, 'hay@localhost.localdomain'} ! ok,
-    N;
-loop(N) ->
-    {hay, 'hay@localhost.localdomain'} ! {self(), N},
-    receive
-        A -> A
-    end,
-    loop(N + 1).
-
-main(_) ->
-    io:format("~p~n", [loop(0)]).
diff --git a/hay_erl.escript b/hay_erl.escript
deleted file mode 100644
--- a/hay_erl.escript
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/usr/bin/env escript
-%% -*- erlang -*-
-%%! -smp enable -name hay@localhost.localdomain -setcookie cookie
-
--mode(compile).
-
-loop() ->
-    receive
-        {RemotePid, Value} -> RemotePid ! (Value + 1),
-        loop();
-        _ -> ok
-    end.
-
-main(_) ->
-    register(hay, self()),
-    loop().
diff --git a/hinterface.cabal b/hinterface.cabal
--- a/hinterface.cabal
+++ b/hinterface.cabal
@@ -1,5 +1,5 @@
 name: hinterface
-version: 0.5.0.1
+version: 0.5.0.2
 cabal-version: >=1.22
 build-type: Simple
 license: BSD3
@@ -19,9 +19,6 @@
 author: Timo Koepke, Sven Heyll
 extra-source-files:
     README.md
-    erl_echo.escript
-    erl_hay.escript
-    hay_erl.escript
     stack.yaml
     .travis.yml
     Setup.hs
@@ -50,30 +47,30 @@
         Foreign.Erlang.Mailbox
         Foreign.Erlang.Connection
     build-depends:
-        QuickCheck >=2.8.2 && <2.9,
-        array >=0.5.1.1 && <0.6,
-        async >=2.1.1 && <2.2,
+        QuickCheck >=2.9.2,
+        array >=0.5.1.1,
+        async >=2.1.1,
         base >=4.9 && <5,
-        binary >=0.8.3.0 && <0.9,
-        bytestring >=0.10.8.1 && <0.11,
-        containers >=0.5.7.1 && <0.6,
-        cryptonite ==0.19.*,
-        exceptions >=0.8.3 && <0.9,
-        lifted-async >=0.9.0 && <0.10,
-        lifted-base >=0.2.3.8 && <0.3,
-        memory ==0.13.*,
-        monad-control >=1.0.1.0 && <1.1,
-        monad-logger >=0.3.20.1 && <0.4,
-        mtl >=2.2.1 && <2.3,
-        network >=2.6.3.1 && <2.7,
-        random ==1.1.*,
-        resourcet >=1.1.8.1 && <1.2,
-        safe-exceptions >=0.1.4.0 && <0.2,
-        stm >=2.4.4.1 && <2.5,
-        text >=1.2.2.1 && <1.3,
-        transformers >=0.5.2.0 && <0.6,
-        transformers-base >=0.4.4 && <0.5,
-        vector >=0.11.0.0 && <0.12
+        binary >=0.8.3.0,
+        bytestring >=0.10.8.1,
+        containers >=0.5.7.1,
+        cryptonite >=0.21,
+        exceptions >=0.8.3,
+        lifted-async >=0.9.1.1,
+        lifted-base >=0.2.3.10,
+        memory >=0.14.2,
+        monad-control >=1.0.1.0,
+        monad-logger >=0.3.21,
+        mtl >=2.2.1,
+        network >=2.6.3.1,
+        random >=1.1,
+        resourcet >=1.1.9,
+        safe-exceptions >=0.1.5.0,
+        stm >=2.4.4.1,
+        text >=1.2.2.1,
+        transformers >=0.5.2.0,
+        transformers-base >=0.4.4,
+        vector >=0.11.0.0
     default-language: Haskell2010
     default-extensions: OverloadedStrings NamedFieldPuns
                         FlexibleContexts
@@ -84,15 +81,15 @@
     type: exitcode-stdio-1.0
     main-is: Spec.hs
     build-depends:
-        QuickCheck >=2.8.2 && <2.9,
-        async >=2.1.1 && <2.2,
+        QuickCheck >=2.9.2,
+        async >=2.1.1,
         base >=4.9 && <5,
-        binary >=0.8.3.0 && <0.9,
-        bytestring >=0.10.8.1 && <0.11,
-        hinterface >=0.5.0.1 && <0.6,
-        hspec >=2.2.4 && <2.3,
-        monad-logger >=0.3.20.1 && <0.4,
-        transformers >=0.5.2.0 && <0.6
+        binary >=0.8.3.0,
+        bytestring >=0.10.8.1,
+        hinterface >=0.5.0.2,
+        hspec >=2.4.3,
+        monad-logger >=0.3.21,
+        transformers >=0.5.2.0
     default-language: Haskell2010
     default-extensions: OverloadedStrings NamedFieldPuns
     hs-source-dirs: test
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-7.12
+resolver: lts-8.6
 
 packages:
 - '.'
@@ -9,4 +9,4 @@
 
 extra-package-dbs: []
 
-pvp-bounds: both
+pvp-bounds: lower