diff --git a/.travis.yml b/.travis.yml
index 15bacc0..b7c97a9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 dist: trusty
 sudo: required
-node_js: 6
+node_js: 8
 install:
   - npm install -g bower
   - npm install
diff --git a/bower.json b/bower.json
index 5cdb25e..6675717 100644
--- a/bower.json
+++ b/bower.json
@@ -12,10 +12,11 @@
     "output"
   ],
   "dependencies": {
-    "purescript-aff": "^4.0.2"
+    "purescript-aff": "^5.0.0",
+    "purescript-avar": "^3.0.0"
   },
   "devDependencies": {
-    "purescript-psci-support": "^3.0.0",
-    "purescript-test-unit": "^13.0.0"
+    "purescript-psci-support": "^4.0.0",
+    "purescript-test-unit": "^14.0.0"
   }
 }
diff --git a/package.json b/package.json
index 85262e7..b07175f 100644
--- a/package.json
+++ b/package.json
@@ -6,9 +6,9 @@
     "test": "pulp test"
   },
   "devDependencies": {
-    "pulp": "^12.0.1",
-    "purescript": "^0.11.7",
+    "pulp": "^12.0.0",
+    "purescript": "^0.12.0",
     "purescript-psa": "^0.6.0",
-    "rimraf": "^2.6.1"
+    "rimraf": "^2.6.2"
   }
 }
diff --git a/src/Concurrent/BoundedQueue.purs b/src/Concurrent/BoundedQueue.purs
index 6ffe567..356d5f9 100644
--- a/src/Concurrent/BoundedQueue.purs
+++ b/src/Concurrent/BoundedQueue.purs
@@ -14,52 +14,53 @@ module Concurrent.BoundedQueue
 
 import Prelude
 
-import Control.Monad.Aff (Aff)
-import Control.Monad.Aff.AVar as AV
 import Data.Array (unsafeIndex)
 import Data.Maybe (Maybe(..))
 import Data.Unfoldable (replicateA)
+import Effect.Aff (Aff)
+import Effect.Aff.AVar (AVar)
+import Effect.Aff.AVar as AVar
 import Partial.Unsafe (unsafePartial)
 
 newtype BoundedQueue a =
   BoundedQueue
     { size ∷ Int
-    , contents ∷ Array (AV.AVar a)
-    , readPos ∷ AV.AVar Int
-    , writePos ∷ AV.AVar Int
+    , contents ∷ Array (AVar a)
+    , readPos ∷ AVar Int
+    , writePos ∷ AVar Int
     }
 
 -- | Creates a new `BoundedQueue` with the given capacity,
-new ∷ ∀ a eff. Int → Aff (avar ∷ AV.AVAR | eff) (BoundedQueue a)
+new ∷ ∀ a. Int → Aff (BoundedQueue a)
 new size = do
-  contents ← replicateA size AV.makeEmptyVar
-  readPos ← AV.makeVar 0
-  writePos ← AV.makeVar 0
+  contents ← replicateA size AVar.empty
+  readPos ← AVar.new 0
+  writePos ← AVar.new 0
   pure (BoundedQueue { size, contents, readPos, writePos })
 
 -- | Writes an element to the given queue. Will block if the queue is full until
 -- | someone reads from it.
-write ∷ ∀ a eff. BoundedQueue a → a → Aff (avar ∷ AV.AVAR | eff) Unit
+write ∷ ∀ a. BoundedQueue a → a → Aff Unit
 write (BoundedQueue q) a = do
-  w ← AV.takeVar q.writePos
-  AV.putVar a (unsafePartial unsafeIndex q.contents w)
-  AV.putVar ((w + 1) `mod` q.size) q.writePos
+  w ← AVar.take q.writePos
+  AVar.put a (unsafePartial unsafeIndex q.contents w)
+  AVar.put ((w + 1) `mod` q.size) q.writePos
 
 -- | Reads an element from the given queue, will block if the queue is empty,
 -- | until someone writes to it.
-read ∷ ∀ a eff. BoundedQueue a → Aff (avar ∷ AV.AVAR | eff) a
+read ∷ ∀ a. BoundedQueue a → Aff a
 read (BoundedQueue q) = do
-  r ← AV.takeVar q.readPos
-  v ← AV.takeVar (unsafePartial unsafeIndex q.contents r)
-  AV.putVar ((r + 1) `mod` q.size) q.readPos
+  r ← AVar.take q.readPos
+  v ← AVar.take (unsafePartial unsafeIndex q.contents r)
+  AVar.put ((r + 1) `mod` q.size) q.readPos
   pure v
 
 -- | Checks whether the given queue is empty. Never blocks.
-isEmpty ∷ ∀ a eff. BoundedQueue a → Aff (avar ∷ AV.AVAR | eff) Boolean
+isEmpty ∷ ∀ a. BoundedQueue a → Aff Boolean
 isEmpty (BoundedQueue q) = do
-  AV.tryReadVar q.readPos >>= case _ of
+  AVar.tryRead q.readPos >>= case _ of
     Nothing → pure true
-    Just r → AV.tryReadVar (unsafePartial unsafeIndex q.contents r) <#> case _ of
+    Just r → AVar.tryRead (unsafePartial unsafeIndex q.contents r) <#> case _ of
       Nothing → true
       Just _ → false
 
@@ -68,15 +69,15 @@ isEmpty (BoundedQueue q) = do
 -- |
 -- | *Careful!* If other readers are blocked on the queue `tryRead` will also
 -- | block.
-tryRead ∷ ∀ a eff. BoundedQueue a → Aff (avar ∷ AV.AVAR | eff) (Maybe a)
+tryRead ∷ ∀ a. BoundedQueue a → Aff (Maybe a)
 tryRead (BoundedQueue q) = do
-  r ← AV.takeVar q.readPos
-  AV.tryTakeVar (unsafePartial unsafeIndex q.contents r) >>= case _ of
+  r ← AVar.take q.readPos
+  AVar.tryTake (unsafePartial unsafeIndex q.contents r) >>= case _ of
     Just v → do
-      AV.putVar ((r + 1) `mod` q.size) q.readPos
+      AVar.put ((r + 1) `mod` q.size) q.readPos
       pure (Just v)
     Nothing → do
-      AV.putVar r q.readPos
+      AVar.put r q.readPos
       pure Nothing
 
 -- | Attempts to write an element into the given queue. If the queue is full,
@@ -84,13 +85,13 @@ tryRead (BoundedQueue q) = do
 -- |
 -- | *Careful!* If other writers are blocked on the queue `tryWrite` will also
 -- | block.
-tryWrite ∷ ∀ a eff. BoundedQueue a → a → Aff (avar ∷ AV.AVAR | eff) Boolean
+tryWrite ∷ ∀ a. BoundedQueue a → a → Aff Boolean
 tryWrite (BoundedQueue q) a = do
-  w ← AV.takeVar q.writePos
-  AV.tryPutVar a (unsafePartial unsafeIndex q.contents w) >>= if _
+  w ← AVar.take q.writePos
+  AVar.tryPut a (unsafePartial unsafeIndex q.contents w) >>= if _
     then do
-      AV.putVar ((w + 1) `mod` q.size) q.writePos
+      AVar.put ((w + 1) `mod` q.size) q.writePos
       pure true
     else do
-      AV.putVar w q.writePos
+      AVar.put w q.writePos
       pure false
diff --git a/src/Concurrent/Queue.purs b/src/Concurrent/Queue.purs
index 1131b7a..2640da3 100644
--- a/src/Concurrent/Queue.purs
+++ b/src/Concurrent/Queue.purs
@@ -9,9 +9,10 @@ module Concurrent.Queue
 
 import Prelude
 
-import Control.Monad.Aff (Aff)
-import Control.Monad.Aff.AVar (AVAR, AVar, makeEmptyVar, makeVar, putVar, readVar, takeVar, tryReadVar)
 import Data.Maybe (Maybe(..))
+import Effect.Aff (Aff)
+import Effect.Aff.AVar (AVar)
+import Effect.Aff.AVar as AVar
 
 -- | An unbounded Queue fit for concurrent access.
 newtype Queue a = Queue
@@ -23,28 +24,28 @@ type Stream a = AVar (QItem a)
 data QItem a = QItem a (Stream a)
 
 -- | Creates a new `Queue`.
-new ∷ ∀ a e. Aff (avar ∷ AVAR | e) (Queue a)
+new ∷ ∀ a. Aff (Queue a)
 new = do
-  hole ← makeEmptyVar
-  readEnd ← makeVar hole
-  writeEnd ← makeVar hole
+  hole ← AVar.empty
+  readEnd ← AVar.new hole
+  writeEnd ← AVar.new hole
   pure (Queue { readEnd, writeEnd })
 
 -- | Writes a new value into the queue
-write ∷ ∀ a e. Queue a → a → Aff (avar ∷ AVAR | e) Unit
+write ∷ ∀ a. Queue a → a → Aff Unit
 write (Queue q) a = do
-  newHole ← makeEmptyVar
-  oldHole ← takeVar q.writeEnd
-  putVar (QItem a newHole) oldHole
-  putVar newHole q.writeEnd
+  newHole ← AVar.empty
+  oldHole ← AVar.take q.writeEnd
+  AVar.put (QItem a newHole) oldHole
+  AVar.put newHole q.writeEnd
 
 -- | Reads a value from the queue. Blocks if the queue is empty, and resumes
 -- | when it has been written to.
-read ∷ ∀ a e. Queue a → Aff (avar ∷ AVAR | e) a
+read ∷ ∀ a. Queue a → Aff a
 read (Queue q) = do
-  readEnd ← takeVar q.readEnd
-  QItem a newRead ← readVar readEnd
-  putVar newRead q.readEnd
+  readEnd ← AVar.take q.readEnd
+  QItem a newRead ← AVar.read readEnd
+  AVar.put newRead q.readEnd
   pure a
 
 -- | Attempts to read a value from the queue. Fails with `Nothing` if the queue
@@ -52,13 +53,13 @@ read (Queue q) = do
 -- |
 -- | *CAREFUL!* This will block if other readers are blocked on the
 -- | queue.
-tryRead ∷ ∀ a e. Queue a → Aff (avar ∷ AVAR | e) (Maybe a)
+tryRead ∷ ∀ a. Queue a → Aff (Maybe a)
 tryRead (Queue q) = do
-  readEnd ← takeVar q.readEnd
-  tryReadVar readEnd >>= case _ of
+  readEnd ← AVar.take q.readEnd
+  AVar.tryRead readEnd >>= case _ of
     Just (QItem a newRead) → do
-      putVar newRead q.readEnd
+      AVar.put newRead q.readEnd
       pure (Just a)
     Nothing → do
-      putVar readEnd q.readEnd
+      AVar.put readEnd q.readEnd
       pure Nothing
diff --git a/test/BoundedQueue.purs b/test/BoundedQueue.purs
index 06abdf8..0e05331 100644
--- a/test/BoundedQueue.purs
+++ b/test/BoundedQueue.purs
@@ -4,21 +4,20 @@ import Prelude
 
 import Concurrent.BoundedQueue as BQ
 import Control.Alt ((<|>))
-import Control.Monad.Aff (Aff, Milliseconds(..), delay, forkAff, parallel, sequential)
-import Control.Monad.Aff.AVar (AVAR)
 import Data.Either (Either(..), isLeft, isRight)
 import Data.Int (toNumber)
 import Data.Maybe (Maybe(..), isNothing)
+import Effect.Aff (Aff, Milliseconds(..), delay, forkAff, parallel, sequential)
 import Test.Unit (TestSuite, suite, test)
 import Test.Unit.Assert as Assert
 
-race ∷ ∀ a b e. Aff e a → Aff e b → Aff e (Either a b)
+race ∷ ∀ a b. Aff a → Aff b → Aff (Either a b)
 race a b = sequential ((parallel (map Left a)) <|> (parallel (map Right b)))
 
-delayMs ∷ ∀ e. Int → Aff e Unit
+delayMs ∷ Int → Aff Unit
 delayMs = delay <<< Milliseconds <<< toNumber
 
-boundedQueueSuite ∷ ∀ e. TestSuite (avar ∷ AVAR | e)
+boundedQueueSuite ∷ TestSuite
 boundedQueueSuite = do
   suite "Simple operations" do
     test "inserting and popping elements" do
diff --git a/test/Main.purs b/test/Main.purs
index 61992a3..4901c3f 100644
--- a/test/Main.purs
+++ b/test/Main.purs
@@ -2,16 +2,13 @@ module Test.Main where
 
 import Prelude
 
-import Control.Monad.Aff.AVar (AVAR)
-import Control.Monad.Aff.Console (CONSOLE)
-import Control.Monad.Eff (Eff)
+import Effect (Effect)
 import Test.BoundedQueue (boundedQueueSuite)
 import Test.Queue (queueSuite)
 import Test.Unit (suite)
-import Test.Unit.Console (TESTOUTPUT)
 import Test.Unit.Main (runTest)
 
-main ∷ ∀ e. Eff (console ∷ CONSOLE, testOutput ∷ TESTOUTPUT, avar ∷ AVAR | e) Unit
+main ∷ Effect Unit
 main = runTest do
   suite "Queue" queueSuite
   suite "BoundedQueue" boundedQueueSuite
diff --git a/test/Queue.purs b/test/Queue.purs
index edcb4aa..e5b8cd0 100644
--- a/test/Queue.purs
+++ b/test/Queue.purs
@@ -4,21 +4,20 @@ import Prelude
 
 import Concurrent.Queue as Q
 import Control.Alt ((<|>))
-import Control.Monad.Aff (Aff, Milliseconds(..), delay, forkAff, parallel, sequential)
-import Control.Monad.Aff.AVar (AVAR)
 import Data.Either (Either(..), isLeft, isRight)
 import Data.Int (toNumber)
 import Data.Maybe (Maybe(..), isNothing)
+import Effect.Aff (Aff, Milliseconds(..), delay, forkAff, parallel, sequential)
 import Test.Unit (TestSuite, suite, test)
 import Test.Unit.Assert as Assert
 
-race ∷ ∀ a b e. Aff e a → Aff e b → Aff e (Either a b)
+race ∷ ∀ a b. Aff a → Aff b → Aff (Either a b)
 race a b = sequential ((parallel (map Left a)) <|> (parallel (map Right b)))
 
-delayMs ∷ ∀ e. Int → Aff e Unit
+delayMs ∷ Int → Aff Unit
 delayMs = delay <<< Milliseconds <<< toNumber
 
-queueSuite ∷ ∀ e. TestSuite (avar ∷ AVAR | e)
+queueSuite ∷ TestSuite
 queueSuite = do
   suite "Simple operations" do
     test "inserting and popping elements" do