diff --git a/libsyncthing/CMakeLists.txt b/libsyncthing/CMakeLists.txt
index 6f215e6..a487757 100644
--- a/libsyncthing/CMakeLists.txt
+++ b/libsyncthing/CMakeLists.txt
@@ -6,7 +6,7 @@ set(META_PROJECT_TYPE library)
 set(META_APP_NAME "Syncthing library")
 set(META_APP_DESCRIPTION "Syncthing itself, built as a shared or static library")
 set(META_PROJECT_VARNAME_UPPER LIB_SYNCTHING)
-set(META_SYNCTHING_VERSION "v1.4.2")
+set(META_SYNCTHING_VERSION "v1.5.0")
 
 # add project files
 set(HEADER_FILES interface.h)
diff --git a/libsyncthing/go/src/github.com/syncthing/syncthing b/libsyncthing/go/src/github.com/syncthing/syncthing
index 59c8bec..dea7226 160000
--- a/libsyncthing/go/src/github.com/syncthing/syncthing
+++ b/libsyncthing/go/src/github.com/syncthing/syncthing
@@ -1 +1 @@
-Subproject commit 59c8bec1e592c23766b1f49d0e4cb005b4be70cf
+Subproject commit dea7226ee5caf6e508b397571ccf04547c8f6b5b
diff --git a/libsyncthing/interface.cpp b/libsyncthing/interface.cpp
index 81609fd..b5963cb 100644
--- a/libsyncthing/interface.cpp
+++ b/libsyncthing/interface.cpp
@@ -140,8 +140,9 @@ std::int64_t runSyncthing(const RuntimeOptions &options)
     if (!runningState) {
         return -1;
     }
-    return ::libst_run_syncthing(gostr(options.configDir), gostr(options.guiAddress), gostr(options.guiApiKey), options.verbose,
-        options.allowNewerConfig, options.noDefaultConfig, options.ensureConfigDirectoryExists);
+    return ::libst_run_syncthing(gostr(options.configDir), gostr(options.dataDir), gostr(options.guiAddress), gostr(options.guiApiKey),
+        options.flags & RuntimeFlags::Verbose, options.flags & RuntimeFlags::AllowNewerConfig, options.flags & RuntimeFlags::NoDefaultConfig,
+        options.flags & RuntimeFlags::EnsureConfigDirExists, options.flags & RuntimeFlags::EnsureDataDirExists);
 }
 
 /*!
diff --git a/libsyncthing/interface.h b/libsyncthing/interface.h
index 471ee5b..d7bc243 100644
--- a/libsyncthing/interface.h
+++ b/libsyncthing/interface.h
@@ -6,18 +6,36 @@
 #include <cstdint>
 #include <functional>
 #include <string>
+#include <type_traits>
 #include <vector>
 
 namespace LibSyncthing {
 
+enum class RuntimeFlags : std::uint64_t {
+    None = 0,
+    Verbose = (1 << 0),
+    AllowNewerConfig = (1 << 1),
+    NoDefaultConfig = (1 << 2),
+    EnsureConfigDirExists = (1 << 3),
+    EnsureDataDirExists = (1 << 4),
+};
+
+constexpr bool operator&(RuntimeFlags lhs, RuntimeFlags rhs)
+{
+    return static_cast<std::underlying_type_t<RuntimeFlags>>(lhs) & static_cast<std::underlying_type_t<RuntimeFlags>>(rhs);
+}
+
+constexpr RuntimeFlags operator|(RuntimeFlags lhs, RuntimeFlags rhs)
+{
+    return static_cast<RuntimeFlags>(static_cast<std::underlying_type_t<RuntimeFlags>>(lhs) | static_cast<std::underlying_type_t<RuntimeFlags>>(rhs));
+}
+
 struct RuntimeOptions {
     std::string configDir;
+    std::string dataDir;
     std::string guiAddress;
     std::string guiApiKey;
-    bool verbose = false;
-    bool allowNewerConfig = true;
-    bool noDefaultConfig = false;
-    bool ensureConfigDirectoryExists = true;
+    RuntimeFlags flags = RuntimeFlags::AllowNewerConfig | RuntimeFlags::EnsureConfigDirExists | RuntimeFlags::EnsureDataDirExists;
 };
 
 enum class LogLevel : int {
diff --git a/libsyncthing/tests/interfacetests.cpp b/libsyncthing/tests/interfacetests.cpp
index 3935a12..409d4f6 100644
--- a/libsyncthing/tests/interfacetests.cpp
+++ b/libsyncthing/tests/interfacetests.cpp
@@ -234,6 +234,7 @@ void InterfaceTests::testRunWithoutConfig()
 {
     RuntimeOptions options;
     options.configDir = TestApplication::instance()->workingDirectory() + "/does/not/exist";
+    options.dataDir = TestApplication::instance()->workingDirectory() + "/does/also/not/exist";
     filesystem::remove_all(TestApplication::instance()->workingDirectory() + "/does");
     testRun(bind(static_cast<std::int64_t (*)(const RuntimeOptions &)>(&runSyncthing), cref(options)), false);
 }
@@ -245,6 +246,6 @@ void InterfaceTests::testRunWithoutConfig()
 void InterfaceTests::testRunWidthConfig()
 {
     RuntimeOptions options;
-    options.configDir = setupTestConfigDir();
+    options.configDir = options.dataDir = setupTestConfigDir();
     testRun(bind(static_cast<std::int64_t (*)(const RuntimeOptions &)>(&runSyncthing), cref(options)), true);
 }
diff --git a/widgets/misc/syncthinglauncher.cpp b/widgets/misc/syncthinglauncher.cpp
index 180275f..00fa4fb 100644
--- a/widgets/misc/syncthinglauncher.cpp
+++ b/widgets/misc/syncthinglauncher.cpp
@@ -119,6 +119,7 @@ void SyncthingLauncher::launch(const Settings::Launcher &launcherSettings)
     if (launcherSettings.useLibSyncthing) {
         LibSyncthing::RuntimeOptions options;
         options.configDir = launcherSettings.libSyncthing.configDir.toStdString();
+        options.dataDir = launcherSettings.libSyncthing.configDir.toStdString();
         setLibSyncthingLogLevel(launcherSettings.libSyncthing.logLevel);
         launch(options);
     } else {
diff --git a/widgets/settings/launcheroptionpage.ui b/widgets/settings/launcheroptionpage.ui
index 8d5d9c1..289c400 100644
--- a/widgets/settings/launcheroptionpage.ui
+++ b/widgets/settings/launcheroptionpage.ui
@@ -71,14 +71,14 @@
       <item row="3" column="1">
        <widget class="QtUtilities::PathSelection" name="configDirPathSelection" native="true"/>
       </item>
-      <item row="4" column="0">
+      <item row="5" column="0">
        <widget class="QLabel" name="logLevelLabel">
         <property name="text">
          <string>Log level</string>
         </property>
        </widget>
       </item>
-      <item row="4" column="1">
+      <item row="5" column="1">
        <widget class="QComboBox" name="logLevelComboBox">
         <item>
          <property name="text">
@@ -107,6 +107,16 @@
         </item>
        </widget>
       </item>
+      <item row="4" column="0">
+       <widget class="QLabel" name="dataDirLabel">
+        <property name="text">
+         <string>Data directory</string>
+        </property>
+       </widget>
+      </item>
+      <item row="4" column="1">
+       <widget class="QtUtilities::PathSelection" name="dataDirPathSelection" native="true"/>
+      </item>
      </layout>
     </widget>
    </item>
@@ -349,5 +359,37 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>useBuiltInVersionCheckBox</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>dataDirLabel</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>273</x>
+     <y>68</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>122</x>
+     <y>156</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>useBuiltInVersionCheckBox</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>dataDirPathSelection</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>273</x>
+     <y>68</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>171</x>
+     <y>156</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
 </ui>
diff --git a/widgets/settings/settings.cpp b/widgets/settings/settings.cpp
index 64eaa02..20e421c 100644
--- a/widgets/settings/settings.cpp
+++ b/widgets/settings/settings.cpp
@@ -293,6 +293,7 @@ void restore()
     launcher.autostartEnabled = settings.value(QStringLiteral("syncthingAutostart"), launcher.autostartEnabled).toBool();
     launcher.useLibSyncthing = settings.value(QStringLiteral("useLibSyncthing"), launcher.useLibSyncthing).toBool();
     launcher.libSyncthing.configDir = settings.value(QStringLiteral("libSyncthingConfigDir"), launcher.libSyncthing.configDir).toString();
+    launcher.libSyncthing.dataDir = settings.value(QStringLiteral("libSyncthingDataDir"), launcher.libSyncthing.dataDir).toString();
     launcher.libSyncthing.logLevel = static_cast<LibSyncthing::LogLevel>(
         settings.value(QStringLiteral("libSyncthingLogLevel"), static_cast<int>(launcher.libSyncthing.logLevel)).toInt());
     launcher.syncthingPath = settings.value(QStringLiteral("syncthingPath"), launcher.syncthingPath).toString();
@@ -394,6 +395,7 @@ void save()
     settings.setValue(QStringLiteral("syncthingAutostart"), launcher.autostartEnabled);
     settings.setValue(QStringLiteral("useLibSyncthing"), launcher.useLibSyncthing);
     settings.setValue(QStringLiteral("libSyncthingConfigDir"), launcher.libSyncthing.configDir);
+    settings.setValue(QStringLiteral("libSyncthingDataDir"), launcher.libSyncthing.dataDir);
     settings.setValue(QStringLiteral("libSyncthingLogLevel"), static_cast<int>(launcher.libSyncthing.logLevel));
     settings.setValue(QStringLiteral("syncthingPath"), launcher.syncthingPath);
     settings.setValue(QStringLiteral("syncthingArgs"), launcher.syncthingArgs);
diff --git a/widgets/settings/settings.h b/widgets/settings/settings.h
index 22e7704..bfb234e 100644
--- a/widgets/settings/settings.h
+++ b/widgets/settings/settings.h
@@ -83,6 +83,7 @@ struct SYNCTHINGWIDGETS_EXPORT Launcher {
 
     struct SYNCTHINGWIDGETS_EXPORT LibSyncthing {
         QString configDir;
+        QString dataDir;
         ::LibSyncthing::LogLevel logLevel = ::LibSyncthing::LogLevel::Info;
     } libSyncthing;
 
diff --git a/widgets/settings/settingsdialog.cpp b/widgets/settings/settingsdialog.cpp
index 94193b3..e58c547 100644
--- a/widgets/settings/settingsdialog.cpp
+++ b/widgets/settings/settingsdialog.cpp
@@ -892,6 +892,7 @@ QWidget *LauncherOptionPage::setupWidget()
         connect(m_restoreArgsButton, &IconButton::clicked, this, &LauncherOptionPage::restoreDefaultArguments);
         ui()->argumentsLineEdit->insertCustomButton(0, m_restoreArgsButton);
         ui()->configDirPathSelection->provideCustomFileMode(QFileDialog::Directory);
+        ui()->dataDirPathSelection->provideCustomFileMode(QFileDialog::Directory);
     }
 
     // setup other widgets
@@ -933,6 +934,7 @@ bool LauncherOptionPage::apply()
         settings.autostartEnabled = ui()->enabledCheckBox->isChecked();
         settings.useLibSyncthing = ui()->useBuiltInVersionCheckBox->isChecked();
         settings.libSyncthing.configDir = ui()->configDirPathSelection->lineEdit()->text();
+        settings.libSyncthing.dataDir = ui()->dataDirPathSelection->lineEdit()->text();
         settings.libSyncthing.logLevel = static_cast<LibSyncthing::LogLevel>(ui()->logLevelComboBox->currentIndex());
         settings.syncthingPath = ui()->syncthingPathSelection->lineEdit()->text();
         settings.syncthingArgs = ui()->argumentsLineEdit->text();
@@ -955,6 +957,7 @@ void LauncherOptionPage::reset()
         ui()->useBuiltInVersionCheckBox->setChecked(settings.useLibSyncthing);
         ui()->useBuiltInVersionCheckBox->setVisible(settings.useLibSyncthing || SyncthingLauncher::isLibSyncthingAvailable());
         ui()->configDirPathSelection->lineEdit()->setText(settings.libSyncthing.configDir);
+        ui()->dataDirPathSelection->lineEdit()->setText(settings.libSyncthing.dataDir);
         ui()->logLevelComboBox->setCurrentIndex(static_cast<int>(settings.libSyncthing.logLevel));
         ui()->syncthingPathSelection->lineEdit()->setText(settings.syncthingPath);
         ui()->argumentsLineEdit->setText(settings.syncthingArgs);