diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cf3dddf..0bf2165 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,14 +19,14 @@ jobs:
       matrix:
         qt-version: [5.15.2, 6.4.1]
         library-type: [shared, static]
-        platform: [windows-latest, ubuntu-latest, macos-latest]
+        platform: [windows-latest, macos-latest] # ubuntu-latest
         include:
           - platform: windows-latest
             CC: cl
             CXX: cl
-          - platform: ubuntu-latest
-            CC: gcc
-            CXX: g++
+          #- platform: ubuntu-latest
+          #  CC: gcc
+          #  CXX: g++
           - platform: macos-latest
             CC: clang
             CXX: clang++
diff --git a/examples/shared/log.cpp b/examples/shared/log.cpp
index aab4f78..5a465de 100644
--- a/examples/shared/log.cpp
+++ b/examples/shared/log.cpp
@@ -62,7 +62,7 @@ static inline void myMessageHandler(const QtMsgType type, const QMessageLogConte
         g_logFile->setFileName(FRAMELESSHELPER_STRING_LITERAL("debug-%1.log").arg(g_app));
         if (!g_logFile->open(QFile::WriteOnly | QFile::Text | QFile::Append)) {
             std::cerr << "Can't open file to write: " << qUtf8Printable(g_logFile->errorString()) << std::endl;
-            delete g_logFile.release();
+            g_logFile.reset();
             g_logError = true;
             return;
         }
diff --git a/src/core/framelessconfig.cpp b/src/core/framelessconfig.cpp
index 09e99bd..69e52d8 100644
--- a/src/core/framelessconfig.cpp
+++ b/src/core/framelessconfig.cpp
@@ -107,13 +107,13 @@ void FramelessConfig::reload(const bool force)
     if (g_data()->loaded && !force) {
         return;
     }
-    const std::unique_ptr<QSettings> configFile([]() -> QSettings * {
-        if (!QCoreApplication::instance()) {
+    const auto configFile = []() -> std::unique_ptr<QSettings> {
+        if (!qApp) {
             return nullptr;
         }
         const QDir appDir(QCoreApplication::applicationDirPath());
-        return new QSettings(appDir.filePath(kConfigFileName), QSettings::IniFormat);
-    }());
+        return std::make_unique<QSettings>(appDir.filePath(kConfigFileName), QSettings::IniFormat);
+    }();
     for (int i = 0; i != OptionCount; ++i) {
         const bool envVar = (!g_data()->disableEnvVar
             && qEnvironmentVariableIsSet(OptionsTable[i].env.constData())
diff --git a/src/core/framelesshelper_win.cpp b/src/core/framelesshelper_win.cpp
index 5fa088e..63ed99e 100644
--- a/src/core/framelesshelper_win.cpp
+++ b/src/core/framelesshelper_win.cpp
@@ -588,7 +588,7 @@ void FramelessHelperWin::removeWindow(const WId windowId)
     if (g_win32Helper()->data.isEmpty()) {
         if (g_win32Helper()->nativeEventFilter) {
             qApp->removeNativeEventFilter(g_win32Helper()->nativeEventFilter.get());
-            delete g_win32Helper()->nativeEventFilter.release();
+            g_win32Helper()->nativeEventFilter.reset();
         }
     }
     HWND hwnd = nullptr;
diff --git a/src/core/registrykey.cpp b/src/core/registrykey.cpp
index 6b9f8bc..25645b3 100644
--- a/src/core/registrykey.cpp
+++ b/src/core/registrykey.cpp
@@ -87,17 +87,17 @@ RegistryKey::RegistryKey(const RegistryRootKey root, const QString &key, QObject
 #if REGISTRYKEY_QWINREGISTRYKEY
     m_registryKey = std::make_unique<QWinRegistryKey>(g_keyMap[static_cast<int>(m_rootKey)], m_subKey);
     if (!m_registryKey->isValid()) {
-        delete m_registryKey.release();
+        m_registryKey.reset();
     }
 #else
     const QString rootKey = g_strMap[static_cast<int>(m_rootKey)];
     const auto lastSlashPos = m_subKey.lastIndexOf(u'\\');
     m_settings = std::make_unique<QSettings>(rootKey + u'\\' + m_subKey.left(lastSlashPos), QSettings::NativeFormat);
     if (m_settings->childGroups().contains(m_subKey.mid(lastSlashPos + 1))) {
-        delete m_settings.release();
+        m_settings.reset();
         m_settings = std::make_unique<QSettings>(rootKey + u'\\' + m_subKey, QSettings::NativeFormat);
     } else {
-        delete m_settings.release();
+        m_settings.reset();
     }
 #endif
 }