diff --git a/ldoce5viewer/qtgui/__init__.py b/ldoce5viewer/qtgui/__init__.py
index 093ba01..56fa851 100644
--- a/ldoce5viewer/qtgui/__init__.py
+++ b/ldoce5viewer/qtgui/__init__.py
@@ -17,7 +17,7 @@
 import codecs
 import os.path
 
-from PyQt4.QtGui import QIcon
+from PyQt5.QtGui import QIcon
 
 from .utils.singleapp import SingleApplication
 from .utils.error import StdErrWrapper, MyStreamHandler
@@ -25,7 +25,7 @@
 
 
 # set a dummy function if QLineEdit doesn't have setPlaceholderText
-from PyQt4.QtGui import QLineEdit
+from PyQt5.QtWidgets import QLineEdit
 if not hasattr(QLineEdit, 'setPlaceholderText'):
     def _dummySetPlaceholderText(self, *args, **kwargs):
         pass
@@ -107,7 +107,7 @@ def messageHandler(msg):
     # On Windows-ja
     if app.font().family() == u'MS UI Gothic':
         cand = (('Segoe UI', None), ('Meiryo UI', None), ('Tahoma', 8))
-        from PyQt4.QtGui import QFont
+        from PyQt5.QtGui import QFont
         for name, point in cand:
             ps = app.font().pointSize()
             if point is None:
diff --git a/ldoce5viewer/qtgui/access.py b/ldoce5viewer/qtgui/access.py
index b25aa86..c8752e0 100644
--- a/ldoce5viewer/qtgui/access.py
+++ b/ldoce5viewer/qtgui/access.py
@@ -8,9 +8,9 @@
 import os.path
 import traceback
 
-from PyQt4.QtCore import (
+from PyQt5.QtCore import (
     Qt, Q_ARG, QMetaObject, QIODevice, QTimer,)
-from PyQt4.QtNetwork import (
+from PyQt5.QtNetwork import (
     QNetworkAccessManager, QNetworkReply, QNetworkRequest,)
 
 from .. import __version__
diff --git a/ldoce5viewer/qtgui/advanced.py b/ldoce5viewer/qtgui/advanced.py
index fa35480..36743a4 100644
--- a/ldoce5viewer/qtgui/advanced.py
+++ b/ldoce5viewer/qtgui/advanced.py
@@ -5,9 +5,11 @@
 
 from operator import itemgetter
 
-from PyQt4.QtCore import Qt, QUrl
-from PyQt4.QtGui import (
-    QAction, QDialog, QKeySequence, QIcon, QTreeWidgetItem,)
+from PyQt5.QtCore import Qt, QUrl, QUrlQuery
+from PyQt5.QtGui import (
+    QKeySequence, QIcon)
+from PyQt5.QtWidgets import (
+    QAction, QDialog, QTreeWidgetItem,)
 
 from ..ldoce5 import advtree
 from ..utils.compat import range
@@ -194,11 +196,13 @@ def _render_header(title, mode, phrase, filters):
 
     for (name, spec) in modes:
         href = QUrl('search:///')
+        urlquery = QUrlQuery()
         if phrase:
-            href.addQueryItem('phrase', phrase)
+            urlquery.addQueryItem('phrase', phrase)
         if filters:
-            href.addQueryItem('filters', filters)
-        href.addQueryItem('mode', name)
+            urlquery.addQueryItem('filters', filters)
+        urlquery.addQueryItem('mode', name)
+        href.setQuery(urlquery)
         if name != mode:
             r.append(
                 '<li><a href="{href}">{title}</a></li>\n'.format(
@@ -276,10 +280,10 @@ def _render_hwdphr(items, mode):
 
 
 def search_and_render(url, fulltext_hp, fulltext_de):
-    query = dict((k, v) for (k, v) in url.queryItems())
-    mode = query.get('mode', None)
-    phrase = query.get('phrase', None)
-    filters = query.get('filters', None)
+    query = QUrlQuery(url)
+    mode = query.queryItemValue('mode')
+    phrase = query.queryItemValue('phrase')
+    filters = query.queryItemValue('filters')
 
     r = []
     if mode in MODE_DICT:
diff --git a/ldoce5viewer/qtgui/async.py b/ldoce5viewer/qtgui/async_.py
similarity index 99%
rename from ldoce5viewer/qtgui/async.py
rename to ldoce5viewer/qtgui/async_.py
index 4b06af4..f578c5b 100644
--- a/ldoce5viewer/qtgui/async.py
+++ b/ldoce5viewer/qtgui/async_.py
@@ -5,7 +5,7 @@
 
 import logging
 
-from PyQt4.QtCore import (
+from PyQt5.QtCore import (
     QObject, QThread, QMutex, QWaitCondition, pyqtSignal)
 
 _logger = logging.getLogger(__name__)
diff --git a/ldoce5viewer/qtgui/config.py b/ldoce5viewer/qtgui/config.py
index 84ea8b1..89e08e9 100644
--- a/ldoce5viewer/qtgui/config.py
+++ b/ldoce5viewer/qtgui/config.py
@@ -12,7 +12,7 @@
 except ImportError:
     import pickle
 
-from PyQt4.QtCore import QReadWriteLock
+from PyQt5.QtCore import QReadWriteLock
 
 
 __config = None
diff --git a/ldoce5viewer/qtgui/indexer.py b/ldoce5viewer/qtgui/indexer.py
index 0fedba6..76baa0b 100644
--- a/ldoce5viewer/qtgui/indexer.py
+++ b/ldoce5viewer/qtgui/indexer.py
@@ -14,8 +14,9 @@
 from struct import Struct
 import traceback
 
-from PyQt4.QtCore import *
-from PyQt4.QtGui import *
+from PyQt5.QtCore import *
+from PyQt5.QtGui import *
+from PyQt5.QtWidgets import *
 import lxml.etree as et
 
 from .. import __version__
diff --git a/ldoce5viewer/qtgui/main.py b/ldoce5viewer/qtgui/main.py
index 129133c..ef6f257 100644
--- a/ldoce5viewer/qtgui/main.py
+++ b/ldoce5viewer/qtgui/main.py
@@ -20,10 +20,13 @@
 except ImportError:
     objc = None
 
-from PyQt4.QtCore import *
-from PyQt4.QtGui import *
-from PyQt4.QtNetwork import *
-from PyQt4.QtWebKit import *
+from PyQt5.QtCore import *
+from PyQt5.QtGui import *
+from PyQt5.QtNetwork import *
+from PyQt5.QtWebKit import *
+from PyQt5.QtWebKitWidgets import *
+from PyQt5.QtWidgets import *
+from PyQt5.QtPrintSupport import *
 
 from .. import fulltext
 from .. import incremental
@@ -36,7 +39,7 @@
 from .advanced import AdvancedSearchDialog
 from .config import get_config
 from .access import MyNetworkAccessManager, _load_static_data
-from .async import AsyncFTSearcher
+from .async_ import AsyncFTSearcher
 from .utils.soundplayer import create_soundplayer
 from .indexer import IndexerDialog
 from .ui.custom import ToolButton, LineEdit
@@ -556,9 +559,13 @@ def finished():
     def downloadSelectedAudio(self):
         path = self._ui.webView.audioUrlToDownload.path()
         def showSaveDialog(data):
-            filename = QFileDialog.getSaveFileName(self,  u'Save mp3',  '',  u'MP3 Files (*.mp3)')
+            filename = QFileDialog.getSaveFileName(self,  u'Save mp3', \
+                '',  u'MP3 Files (*.mp3)')
+            if type(filename) is tuple:
+                filename = filename[0]
+
             if filename != '':
-                file = open(filename, "w")
+                file = open(filename, "wb")
                 file.write(data)
                 file.close()
         self._getAudioData(path, showSaveDialog)
@@ -568,7 +575,8 @@ def _onWebViewLinkClicked(self, url):
         if scheme == 'audio':
             self._playbackAudio(url.path())
         elif scheme == 'lookup':
-            query = dict((k, v) for (k, v) in url.queryItems())
+            urlQuery = QUrlQuery(url)
+            query = dict(urlQuery.queryItems())
             if 'q' in query:
                 q = query['q'].replace('+', ' ')
                 self._ui.lineEditSearch.setText(q)
@@ -682,13 +690,15 @@ def fullSearch(self, phrase, filters, mode=None, only_web=False):
             self._timerUpdateIndex.start(0)
 
         if self._fts_hwdphr and self._fts_defexa:
-            url = QUrl("search:///")
+            urlquery = QUrlQuery()
             if phrase:
-                url.addQueryItem("phrase", phrase)
+                urlquery.addQueryItem("phrase", phrase)
             if filters:
-                url.addQueryItem("filters", filters)
+                urlquery.addQueryItem("filters", filters)
             if mode:
-                url.addQueryItem("mode", mode)
+                urlquery.addQueryItem("mode", mode)
+            url = QUrl("search:///")
+            url.setQuery(urlquery)
             self._ui.webView.load(url)
 
 
diff --git a/ldoce5viewer/qtgui/resources/Makefile b/ldoce5viewer/qtgui/resources/Makefile
index f7c9958..f6a80a0 100644
--- a/ldoce5viewer/qtgui/resources/Makefile
+++ b/ldoce5viewer/qtgui/resources/Makefile
@@ -3,7 +3,7 @@
 FILES := $(wildcard *.png) $(wildcard *.svg) $(wildcard */*.png)
 
 __init__.py: resource.qrc $(FILES)
-	pyrcc4 -py3 $< -o $@
+	pyrcc5 $< -o $@
 
 .PHONY: clean
 clean:
diff --git a/ldoce5viewer/qtgui/ui/Makefile b/ldoce5viewer/qtgui/ui/Makefile
index 7f80401..ed1f405 100644
--- a/ldoce5viewer/qtgui/ui/Makefile
+++ b/ldoce5viewer/qtgui/ui/Makefile
@@ -6,7 +6,7 @@ __init__.py:
 	touch $@
 
 %.py: %.ui
-	pyuic4 $< -o $@
+	pyuic5 $< -o $@
 
 .PYONY: clean
 clean:
diff --git a/ldoce5viewer/qtgui/ui/custom.py b/ldoce5viewer/qtgui/ui/custom.py
index f475f42..ad455c4 100644
--- a/ldoce5viewer/qtgui/ui/custom.py
+++ b/ldoce5viewer/qtgui/ui/custom.py
@@ -2,9 +2,11 @@
 
 import sys
 
-from PyQt4.QtCore import *
-from PyQt4.QtGui import *
-from PyQt4.QtWebKit import *
+from PyQt5.QtCore import *
+from PyQt5.QtGui import *
+from PyQt5.QtWebKit import *
+from PyQt5.QtWidgets import *
+from PyQt5.QtWebKitWidgets import *
 from ...utils.text import ellipsis
 
 
@@ -285,7 +287,7 @@ def mouseReleaseEvent(self, event):
 
     def wheelEvent(self, event):
         if event.modifiers() & Qt.ControlModifier:
-             self.wheelWithCtrl.emit(event.delta())
+             self.wheelWithCtrl.emit(event.pixelDelta())
              return
         super(WebView, self).wheelEvent(event)
 
diff --git a/ldoce5viewer/qtgui/ui/main.ui b/ldoce5viewer/qtgui/ui/main.ui
index 427ecf6..bd5d91b 100644
--- a/ldoce5viewer/qtgui/ui/main.ui
+++ b/ldoce5viewer/qtgui/ui/main.ui
@@ -758,7 +758,7 @@
   <customwidget>
    <class>QWebInspector</class>
    <extends>QWidget</extends>
-   <header>PyQt4/QtWebKit</header>
+   <header>PyQt5/QtWebKitWidgets</header>
   </customwidget>
   <customwidget>
    <class>HtmlListWidget</class>
diff --git a/ldoce5viewer/qtgui/utils/error.py b/ldoce5viewer/qtgui/utils/error.py
index 59721a2..3a10bda 100644
--- a/ldoce5viewer/qtgui/utils/error.py
+++ b/ldoce5viewer/qtgui/utils/error.py
@@ -2,8 +2,8 @@
 
 from logging import StreamHandler
 
-from PyQt4.QtCore import QMutex, QObject, pyqtSignal
-from PyQt4.QtGui import QPlainTextEdit
+from PyQt5.QtCore import QMutex, QObject, pyqtSignal
+from PyQt5.QtWidgets import QPlainTextEdit
 
 
 class MyStreamHandler(StreamHandler):
diff --git a/ldoce5viewer/qtgui/utils/fontfallback.py b/ldoce5viewer/qtgui/utils/fontfallback.py
index 3cd769c..a43e19a 100644
--- a/ldoce5viewer/qtgui/utils/fontfallback.py
+++ b/ldoce5viewer/qtgui/utils/fontfallback.py
@@ -5,7 +5,7 @@
 
 import re
 
-from PyQt4.QtGui import QFont
+from PyQt5.QtGui import QFont
 
 
 _DEFAULT_FONT_NAMES = frozenset((b'sans-serif', b'serif', b'monospace'))
diff --git a/ldoce5viewer/qtgui/utils/singleapp.py b/ldoce5viewer/qtgui/utils/singleapp.py
index f6e40ff..7511f7d 100644
--- a/ldoce5viewer/qtgui/utils/singleapp.py
+++ b/ldoce5viewer/qtgui/utils/singleapp.py
@@ -1,9 +1,9 @@
 '''This module prevent you from running two instances of the app'''
 
 
-from PyQt4.QtCore import pyqtSignal, QIODevice
-from PyQt4.QtGui import QApplication
-from PyQt4.QtNetwork import QLocalSocket, QLocalServer
+from PyQt5.QtCore import pyqtSignal, QIODevice
+from PyQt5.QtWidgets import QApplication
+from PyQt5.QtNetwork import QLocalSocket, QLocalServer
 
 
 class SingleApplication(QApplication):
diff --git a/ldoce5viewer/qtgui/utils/soundplayer.py b/ldoce5viewer/qtgui/utils/soundplayer.py
index 0c8046d..8d93665 100644
--- a/ldoce5viewer/qtgui/utils/soundplayer.py
+++ b/ldoce5viewer/qtgui/utils/soundplayer.py
@@ -1,10 +1,10 @@
 import sys
 import os
 import abc
-from tempfile import NamedTemporaryFile
+from tempfile import NamedTemporaryFile, mkdtemp
 import logging
 
-from PyQt4.QtCore import *
+from PyQt5.QtCore import *
 from ...utils.compat import range
 
 _logger = logging.getLogger(__name__)
@@ -50,11 +50,18 @@
 
 # Qt-Phonon
 try:
-    from PyQt4.phonon import Phonon
+    from PyQt5.phonon import Phonon
 except ImportError:
     Phonon = None
 
 
+# Qt-Multimedia
+try:
+    import PyQt5.QtMultimedia as QtMultimedia
+except ImportError:
+    QtMultimedia = None
+
+
 class Backend(object):
     __metaclass__ = abc.ABCMeta
     def __init__(self, parent, temp_dir):
@@ -254,6 +261,29 @@ def close(self):
         self._clean_tmp()
 
 
+class QtMultimediaBackend(Backend):
+    def __init__(self, parent, temp_dir):
+        self._player = QtMultimedia.QMediaPlayer()
+        self._tmpdir = mkdtemp()
+
+    def _play(self):
+        url = QUrl.fromLocalFile(self._path)
+        content = QtMultimedia.QMediaContent(url)
+        self._player.setMedia(content)
+        self._player.play()
+
+    def play(self, data):
+        self._player.stop()
+        with NamedTemporaryFile(mode='w+b', prefix='',
+                suffix='.tmp.mp3', dir=self._tmpdir, delete=False) as f:
+            f.write(data)
+            self._path = f.name
+        QTimer.singleShot(0, self._play)
+
+    def close(self):
+        self._player.stop()
+
+
 class AppKitBackend(Backend):
     def __init__(self, parent, temp_dir):
         self._sound = None
@@ -281,6 +311,8 @@ def create_soundplayer(parent, temp_dir):
         backends.append(WinMCIBackend)
     if Phonon:
         backends.append(PhononBackend)
+    if QtMultimedia:
+        backends.append(QtMultimediaBackend)
     if Gst:
         backends.append(GstreamerBackend)
     if gst: