diff --git a/.travis.yml b/.travis.yml
index 085a1c0..c87fba5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,10 +2,10 @@ os:
   - linux
 
 env:
-  - BRANCH="master"
+  - BRANCH="devel"
 
 install:
-  - git clone -b $BRANCH git://github.com/Araq/Nim.git; cd Nim; git clone -b $BRANCH --depth 1 git://github.com/nim-lang/csources; cd csources && sh build.sh; cd ..; bin/nim c koch; ./koch boot -d:release; cd ..; export PATH=`pwd`/Nim/bin:$PATH
+  - git clone -b $BRANCH git://github.com/nim-lang/Nim.git; cd Nim; git clone -b master --depth 1 git://github.com/nim-lang/csources; cd csources && sh build.sh; cd ..; bin/nim c koch; ./koch boot -d:release; cd ..; export PATH=`pwd`/Nim/bin:$PATH
   - git clone https://github.com/nim-lang/nimble.git; cd nimble; yes | nim c -r src/nimble install; cd ..; export PATH=~/.nimble/bin:$PATH; nimble update; nimble install msgpack4nim
 
 before_script:
diff --git a/example/example_server.nim b/example/example_server.nim
index a97ae83..b910a1c 100644
--- a/example/example_server.nim
+++ b/example/example_server.nim
@@ -1,4 +1,4 @@
-import nimrpc/rpc_server, nimrpc/rpc_type, asyncnet, asyncdispatch, msgpack
+import nimrpc/rpc_server, nimrpc/rpc_type, asyncnet, asyncdispatch, msgpack4nim
 
 # Define your remote proc
 # Remote porc must have two params, first is input, second is output (so it's var param).
diff --git a/nimrpc.nimble b/nimrpc.nimble
index a97d03d..a6909e8 100644
--- a/nimrpc.nimble
+++ b/nimrpc.nimble
@@ -9,7 +9,7 @@ srcDir      = "src"
 [Deps]
 Requires:   """
 
-nim >= 0.11.2
+nim >= 0.18.1
 msgpack4nim >= 0.1.2
 
 
diff --git a/src/nimrpc/rpc_client.nim b/src/nimrpc/rpc_client.nim
index 1452c77..278509a 100644
--- a/src/nimrpc/rpc_client.nim
+++ b/src/nimrpc/rpc_client.nim
@@ -1,4 +1,4 @@
-import net, asyncdispatch, msgpack, tables
+import net, asyncdispatch, msgpack4nim, tables
 import rpc_type
 
 type
diff --git a/src/nimrpc/rpc_server.nim b/src/nimrpc/rpc_server.nim
index 6836023..dc967ce 100644
--- a/src/nimrpc/rpc_server.nim
+++ b/src/nimrpc/rpc_server.nim
@@ -1,4 +1,4 @@
-import asyncnet, asyncdispatch, msgpack, tables
+import asyncnet, asyncdispatch, msgpack4nim, tables
 import rpc_type
 
 type