diff --git a/Hash2Pub.cabal b/Hash2Pub.cabal
index 376d675..7be7ecf 100644
--- a/Hash2Pub.cabal
+++ b/Hash2Pub.cabal
@@ -46,7 +46,7 @@ category:            Network
 extra-source-files:  CHANGELOG.md
 
 common deps
-  build-depends:       base >=4, containers ^>=0.6.0.1, bytestring, utf8-string ^>=1.0.1.1, network ^>=3.1, time, cmdargs ^>= 0.10, cryptonite, memory, async, stm, asn1-encoding, asn1-types, asn1-parse, publicsuffix, network-byte-order, safe, iproute, mtl, random, servant, servant-server, servant-client, warp, text, unordered-containers, hashable, unicode-transforms, http-client, http-types, unbounded-delays, dlist, formatting
+  build-depends:       base ^>=4.12.0.0, containers ^>=0.6.0.1, bytestring, utf8-string ^>=1.0.1.1, network ^>=2.8.0.1, time ^>=1.8.0.2, cmdargs ^>= 0.10, cryptonite ^>= 0.25, memory, async, stm, asn1-encoding, asn1-types, asn1-parse, publicsuffix, network-byte-order, safe, iproute, mtl, random, servant, servant-server, servant-client, warp, text, unordered-containers, hashable, unicode-transforms, http-client, http-types, unbounded-delays, dlist, formatting
   ghc-options:         -Wall -Wpartial-fields -O2
 
 
@@ -58,7 +58,7 @@ library
   exposed-modules:     Hash2Pub.FediChord, Hash2Pub.FediChordTypes, Hash2Pub.DHTProtocol, Hash2Pub.ASN1Coding, Hash2Pub.ProtocolTypes, Hash2Pub.PostService, Hash2Pub.RingMap
 
   -- Modules included in this library but not exported.
-  other-modules: Hash2Pub.Utils, Hash2Pub.PostService.API
+  other-modules: Hash2Pub.Utils
 
   -- LANGUAGE extensions used by modules in this package.
   other-extensions:    GeneralizedNewtypeDeriving, DataKinds, OverloadedStrings
@@ -91,7 +91,7 @@ executable Hash2Pub
   -- Base language which the package is written in.
   default-language:    Haskell2010
 
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  ghc-options:         -threaded
 
 executable Experiment
   -- experiment runner
diff --git a/Readme.md b/Readme.md
index e3cff3d..daf9e38 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,7 +1,7 @@
 # Hash2Pub
 
 ***This is heavily WIP and does not provide any useful functionality yet***.  
-I aim for always having the `mainline` branch in a state where it builds and tests pass.
+I aim for always having the master branch at a state where it builds and tests pass.
 
 A fully-decentralised relay for global hashtag federation in [ActivityPub](https://activitypub.rocks) based on a distributed hash table.
 It allows querying and subscribing to all posts of a certain hashtag and is implemented in Haskell.
@@ -10,8 +10,6 @@ This is the practical implementation of the concept presented in the paper [Dece
 
 The ASN.1 module schema used for DHT messages can be found in `FediChord.asn1`.
 
-For further questions and discussins, please refer to the **Hash2Pub topic in [SocialHub](https://socialhub.activitypub.rocks/c/software/hash2pub/48)**.
-
 ## Building
 
 The project and its developent environment are built with [Nix](https://nixos.org/nix/).
diff --git a/app/Experiment.hs b/app/Experiment.hs
index f2fa586..a999dea 100644
--- a/app/Experiment.hs
+++ b/app/Experiment.hs
@@ -40,7 +40,7 @@ executeSchedule :: Int  -- ^ speedup factor
                 -> IO ()
 executeSchedule speedup events = do
     -- initialise HTTP manager
-    httpMan <- HTTP.newManager $ HTTP.defaultManagerSettings { HTTP.managerResponseTimeout = HTTP.responseTimeoutMicro 60000000 }
+    httpMan <- HTTP.newManager HTTP.defaultManagerSettings
     forM_ events $ \(delay, tag, (pubHost, pubPort)) -> do
         _ <- forkIO $
             clientPublishPost httpMan pubHost pubPort ("foobar #" <> tag)
diff --git a/default.nix b/default.nix
index a3f7640..cea4aa3 100644
--- a/default.nix
+++ b/default.nix
@@ -1,18 +1,26 @@
 {
-  compiler ? "ghc884"
+  compiler ? "ghc865",
+  withHIE ? false
 }:
 
 let
+  # pin all-hies for getting the language server
+  all-hies = fetchTarball {
+    url = "https://github.com/infinisil/all-hies/tarball/b8fb659620b99b4a393922abaa03a1695e2ca64d";
+    sha256 = "sha256:0br6wsqpfk1lzz90f7zw439w1ir2p54268qilw9l2pk6yz7ganfx";
+  };
   pkgs = import (
     builtins.fetchGit {
       name = "nixpkgs-pinned";
       url = https://github.com/NixOS/nixpkgs/;
-      ref = "refs/heads/release-20.09";
-      rev = "e065200fc90175a8f6e50e76ef10a48786126e1c";
+      ref = "refs/heads/release-20.03";
+      rev = "de3780b937d2984f9b5e20d191f23be4f857b3aa";
     }) {
       # Pass no config for purity
           config = {};
-              overlays = [];
+              overlays = [
+                      (import all-hies {}).overlay
+                          ];
     };
   hp = pkgs.haskell.packages."${compiler}";
   src = pkgs.nix-gitignore.gitignoreSource [] ./.;
@@ -30,6 +38,7 @@ in
         hlint
         stylish-haskell
         pkgs.python3Packages.asn1ate
-      ];
+      ]
+      ++ (if withHIE then [ hie ] else []);
   };
 }
diff --git a/shell.nix b/shell.nix
index 82fb296..dafd212 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1 +1 @@
-(import ./default.nix {}).shell
+(import ./default.nix {withHIE = true;}).shell