diff --git a/CMakeLists.txt b/CMakeLists.txt
index 057c05d..f5e7f4f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.11)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.1)
 
 SET(CMAKE_CXX_STANDARD 11)
 SET(CMAKE_CXX_STANDARD_REQUIRED ON)
diff --git a/include/FileAppender.h b/include/FileAppender.h
index ab9e12a..b57a087 100644
--- a/include/FileAppender.h
+++ b/include/FileAppender.h
@@ -32,6 +32,11 @@ class CUTELOGGERSHARED_EXPORT FileAppender : public AbstractStringAppender
     QString fileName() const;
     void setFileName(const QString&);
 
+    bool flushOnWrite() const;
+    void setFlushOnWrite(bool);
+
+    bool flush();
+
     bool reopenFile();
 
   protected:
@@ -42,6 +47,7 @@ class CUTELOGGERSHARED_EXPORT FileAppender : public AbstractStringAppender
 
   private:
     QFile m_logFile;
+    bool m_flushOnWrite;
     QTextStream m_logStream;
     mutable QMutex m_logFileMutex;
 };
diff --git a/include/Logger.h b/include/Logger.h
index 509bc5f..941e556 100644
--- a/include/Logger.h
+++ b/include/Logger.h
@@ -18,6 +18,7 @@
 #include <QString>
 #include <QDebug>
 #include <QDateTime>
+#include <QElapsedTimer>
 
 // Local
 #include "CuteLogger_global.h"
@@ -224,7 +225,7 @@ class CUTELOGGERSHARED_EXPORT LoggerTimingHelper
 
   private:
     Logger* m_logger;
-    QTime m_time;
+    QElapsedTimer m_time;
     Logger::LogLevel m_logLevel;
     Logger::TimingMode m_timingMode;
     const char* m_file;
diff --git a/src/AbstractStringAppender.cpp b/src/AbstractStringAppender.cpp
index ce64aae..ea5883f 100644
--- a/src/AbstractStringAppender.cpp
+++ b/src/AbstractStringAppender.cpp
@@ -20,7 +20,7 @@
 #include <QReadLocker>
 #include <QWriteLocker>
 #include <QDateTime>
-#include <QRegExp>
+#include <QRegularExpression>
 #include <QCoreApplication>
 #include <QThread>
 
@@ -155,12 +155,13 @@ QByteArray AbstractStringAppender::qCleanupFuncinfo(const char* name)
   }
 
   bool hasLambda = false;
-  QRegExp lambdaRegex("::<lambda\\(.*\\)>");
-  int lambdaIndex = lambdaRegex.indexIn(QString::fromLatin1(info));
+  QRegularExpression lambdaRegex("::<lambda\\(.*?\\)>");
+  QRegularExpressionMatch match = lambdaRegex.match(QString::fromLatin1(info));
+  int lambdaIndex = match.capturedStart();
   if (lambdaIndex != -1)
   {
     hasLambda = true;
-    info.remove(lambdaIndex, lambdaRegex.matchedLength());
+    info.remove(lambdaIndex, match.capturedLength());
   }
 
   // operator names with '(', ')', '<', '>' in it
@@ -405,7 +406,7 @@ QString AbstractStringAppender::formattedString(const QDateTime& timeStamp, Logg
 
       // Filename without a path
       else if (command == QLatin1String("file"))
-        chunk = QString(QLatin1String(file)).section(QRegExp("[/\\\\]"), -1);
+        chunk = QString(QLatin1String(file)).section(QRegularExpression("[/\\\\]"), -1);
 
       // Source line number
       else if (command == QLatin1String("line"))
diff --git a/src/FileAppender.cpp b/src/FileAppender.cpp
index b9018b0..7e2b5b6 100644
--- a/src/FileAppender.cpp
+++ b/src/FileAppender.cpp
@@ -26,6 +26,7 @@
 
 //! Constructs the new file appender assigned to file with the given name.
 FileAppender::FileAppender(const QString& fileName)
+  : m_flushOnWrite(false)
 {
   setFileName(fileName);
 }
@@ -65,6 +66,37 @@ void FileAppender::setFileName(const QString& s)
 }
 
 
+bool FileAppender::flushOnWrite() const
+{
+  return m_flushOnWrite;
+}
+
+
+//! Allows FileAppender to flush file immediately after writing a log record.
+/**
+ * Default value is false. This could result in substantial app slowdown when writing massive amount of log records
+ * with FileAppender on a rather slow file system due to FileAppender blocking until the data would be phisically
+ * written.
+ *
+ * Leaving this as is may result in some log data not being written if the application crashes.
+ */
+void FileAppender::setFlushOnWrite(bool flush)
+{
+  m_flushOnWrite = flush;
+}
+
+
+//! Force-flush any remaining buffers to file system. Returns true if successful, otherwise returns false.
+bool FileAppender::flush()
+{
+  QMutexLocker locker(&m_logFileMutex);
+  if (m_logFile.isOpen())
+    return m_logFile.flush();
+  else
+    return true;
+}
+
+
 bool FileAppender::reopenFile()
 {
   closeFile();
@@ -104,7 +136,8 @@ void FileAppender::append(const QDateTime& timeStamp, Logger::LogLevel logLevel,
   {
     m_logStream << formattedString(timeStamp, logLevel, file, line, function, category, message);
     m_logStream.flush();
-    m_logFile.flush();
+    if (m_flushOnWrite)
+      m_logFile.flush();
   }
 }
 
diff --git a/src/Logger.cpp b/src/Logger.cpp
index 16a18db..5499d03 100644
--- a/src/Logger.cpp
+++ b/src/Logger.cpp
@@ -22,7 +22,6 @@
 #include <QSemaphore>
 #include <QDateTime>
 #include <QIODevice>
-#include <QTextCodec>
 
 #if defined(Q_OS_ANDROID)
 #  include <android/log.h>
@@ -600,8 +599,14 @@ Logger::~Logger()
 
   // Cleanup appenders
   QMutexLocker appendersLocker(&d->loggerMutex);
+#if QT_VERSION >= 0x050e00
+  QSet<AbstractAppender*> deleteList(d->appenders.begin(), d->appenders.end());
+  auto cal = d->categoryAppenders.values();
+  deleteList.unite(QSet<AbstractAppender*>(cal.begin(), cal.end()));
+#else
   QSet<AbstractAppender*> deleteList(QSet<AbstractAppender*>::fromList(d->appenders));
   deleteList.unite(QSet<AbstractAppender*>::fromList(d->categoryAppenders.values()));
+#endif
   qDeleteAll(deleteList);
 
   appendersLocker.unlock();
@@ -1032,7 +1037,11 @@ void LoggerTimingHelper::start(const char* msg, ...)
 {
   va_list va;
   va_start(va, msg);
+#if QT_VERSION >= 0x050500
+  m_block = QString().vasprintf(msg, va);
+#else
   m_block = QString().vsprintf(msg, va);
+#endif
   va_end(va);
 
   m_time.start();
@@ -1062,7 +1071,7 @@ LoggerTimingHelper::~LoggerTimingHelper()
   else
     message = QString(QLatin1String("\"%1\" finished in ")).arg(m_block);
 
-  int elapsed = m_time.elapsed();
+  qint64 elapsed = m_time.elapsed();
   if (elapsed >= 10000 && m_timingMode == Logger::TimingAuto)
     message += QString(QLatin1String("%1 s.")).arg(elapsed / 1000);
   else
diff --git a/src/RollingFileAppender.cpp b/src/RollingFileAppender.cpp
index 267744f..bc64a6f 100644
--- a/src/RollingFileAppender.cpp
+++ b/src/RollingFileAppender.cpp
@@ -200,7 +200,11 @@ void RollingFileAppender::computeRollOverTime()
     break;
     default:
       Q_ASSERT_X(false, "DailyRollingFileAppender::computeInterval()", "Invalid datePattern constant");
+#if QT_VERSION >= 0x050800
+      m_rollOverTime = QDateTime::fromSecsSinceEpoch(0);
+#else
       m_rollOverTime = QDateTime::fromTime_t(0);
+#endif
   }
 
   m_rollOverSuffix = start.toString(m_datePatternString);