diff --git a/bower.json b/bower.json
index 4931d0a..6a4cad1 100644
--- a/bower.json
+++ b/bower.json
@@ -25,13 +25,14 @@
     "url": "git://github.com/KtorZ/purescript-ifrit.git"
   },
   "dependencies": {
-    "purescript-maybe": "3.0.0",
-    "purescript-aff": "3.1.0",
-    "purescript-datetime": "3.2.0"
+    "purescript-maybe": "^3.0.0",
+    "purescript-aff": "^3.1.0",
+    "purescript-datetime": "^3.2.0"
   },
   "devDependencies": {
-    "purescript-spec": "1.0.0",
-    "purescript-psci-support": "3.0.0",
-    "purescript-now": "3.0.0"
+    "purescript-spec": "^1.0.0",
+    "purescript-psci-support": "^3.0.0",
+    "purescript-now": "^3.0.0",
+    "purescript-spec-mocha": "https://github.com/truqu/purescript-spec-mocha.git#0.5.0"
   }
 }
diff --git a/src/Test/Spec/Mocha.js b/src/Test/Spec/Mocha.js
deleted file mode 100644
index 43faf5c..0000000
--- a/src/Test/Spec/Mocha.js
+++ /dev/null
@@ -1,46 +0,0 @@
-/* global exports, it */
-
-// module Test.Spec.Mocha
-
-if (typeof describe !== 'function' || typeof it !== 'function') {
-    throw new Error('Mocha globals seem to be unavailable!');
-}
-
-exports.itAsync = function (only) {
-    "use strict";
-    return function (name) {
-        return function (aff) {
-            return function () {
-                var f = only ? it.only : it;
-                f(name, function (done) {
-                    aff(function () {
-                        done();
-                    }, function (err) {
-                        done(err);
-                    });
-                });
-            };
-        };
-    };
-};
-
-exports.itPending = function (name) {
-    "use strict";
-    return function () {
-        it(name);
-    };
-};
-
-exports.describe = function (only) {
-    "use strict";
-    return function (name) {
-        return function (nested) {
-            return function () {
-                var f = only ? describe.only : describe;
-                f(name, function () {
-                    nested();
-                });
-            };
-        };
-    };
-};
diff --git a/src/Test/Spec/Mocha.purs b/src/Test/Spec/Mocha.purs
deleted file mode 100644
index 28f97f3..0000000
--- a/src/Test/Spec/Mocha.purs
+++ /dev/null
@@ -1,41 +0,0 @@
-module Test.Spec.Mocha (
-  runMocha,
-  MOCHA()
-  ) where
-
-import Prelude
-
-import Control.Monad.Aff           (Aff())
-import Control.Monad.Eff           (kind Effect, Eff())
-
-import Data.Foldable               (traverse_)
-
-import Test.Spec                   (Spec, Group(..), collect)
-
-foreign import data MOCHA :: Effect
-
-foreign import itAsync :: forall e.
-                          Boolean
-                       -> String
-                       -> Aff e Unit
-                       -> Eff (mocha :: MOCHA | e) Unit
-
-foreign import itPending :: forall e. String
-                         -> Eff (mocha :: MOCHA | e) Unit
-
-foreign import describe :: forall e.
-                           Boolean
-                        -> String
-                        -> Eff (mocha :: MOCHA | e) Unit
-                        -> Eff (mocha :: MOCHA | e) Unit
-
-registerGroup :: forall e. (Group (Aff e Unit))
-              -> Eff (mocha :: MOCHA | e) Unit
-registerGroup (It only name test) = itAsync only name test
-registerGroup (Pending name) = itPending name
-registerGroup (Describe only name groups) =
-  describe only name (traverse_ registerGroup groups)
-
-runMocha :: forall e. Spec e Unit
-            -> Eff (mocha :: MOCHA | e) Unit
-runMocha spec = traverse_ registerGroup (collect spec)