diff --git a/src/GLWidget.cpp b/src/GLWidget.cpp
index f331669..4989af8 100644
--- a/src/GLWidget.cpp
+++ b/src/GLWidget.cpp
@@ -21,6 +21,8 @@ GLWidget::GLWidget(Simulation * simulation) : simulation(simulation) {
 void GLWidget::initializeGL() {
 	initializeOpenGLFunctions();
 
+	std::cout << "OpenGL Version: " << format().majorVersion() << "." << format().minorVersion() << std::endl;
+
 	pendulaProgram = new QOpenGLShaderProgram;
 	pendulaProgram->addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/vertex_pendula.glsl");
 	pendulaProgram->addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/fragment_pendula.glsl");
diff --git a/src/Simulation.h b/src/Simulation.h
index b2f6ef2..5781abf 100644
--- a/src/Simulation.h
+++ b/src/Simulation.h
@@ -5,8 +5,6 @@
 #include "Pendulum.h"
 #include <semaphore>
 
-using namespace std::chrono;
-
 class QTimer;
 class FPS;
 
diff --git a/src/main.cpp b/src/main.cpp
index 3293be6..70b48ce 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,7 +8,7 @@ int main(int argc, char* argv[]) {
 	fmt.setDepthBufferSize(24);
 	fmt.setSamples(8);
 	fmt.setSwapInterval(1);
-	fmt.setVersion(3, 3);
+	fmt.setVersion(4, 3);
 	fmt.setProfile(QSurfaceFormat::CoreProfile);
 	QSurfaceFormat::setDefaultFormat(fmt);