diff --git a/README.md b/README.md
index 026c9ef..1e97c94 100644
--- a/README.md
+++ b/README.md
@@ -27,12 +27,12 @@ constant.
 
 ## Installation
 
-VidMan requires [Qt 4.8 or higher](https://www.qt.io/) and [OpenCV 3.0 or higher](https://opencv.org)
+VidMan requires [Qt 5.0 or higher](https://www.qt.io/) and [OpenCV 4.0 or higher](https://opencv.org)
 to compile. Other packages required are `libjpeg-dev` and
-`libdc1394-22-dev`, which can be installed via:
+`libdc1394-22-dev`. On Ubuntu, requirements can be installed with:
 
 ```
-sudo apt-get install libjpeg-dev libdc1394-22-dev
+sudo apt install qtbase5-dev libopencv-dev libjpeg-dev libdc1394-dev
 ```
 
 To compile you can either open the project in Qt creator and proceed from there
diff --git a/app/app.pro b/app/app.pro
index 9e2ad3a..cc6e3ec 100644
--- a/app/app.pro
+++ b/app/app.pro
@@ -44,7 +44,7 @@ CONFIG(release, debug|release) {
     QMAKE_CXXFLAGS_RELEASE += -O3
 }
 
-PKGCONFIG += opencv
+PKGCONFIG += opencv4
 LIBS += -L../lib -lvidman_$$BUILD -ldc1394 -ljpeg
 
 TARGET = vidman_$$BUILD
diff --git a/src/camera.cpp b/src/camera.cpp
index b44a2fa..b1baaa0 100644
--- a/src/camera.cpp
+++ b/src/camera.cpp
@@ -30,7 +30,7 @@ Camera::Camera() :
     empty_(true)
 {
     // Initialize the camera
-    capCam_.open(CV_CAP_FIREWIRE);
+    capCam_.open(cv::CAP_FIREWIRE);
     if(!capCam_.isOpened()) {
         cerr << "No cameras found" << endl;
         return;
@@ -63,7 +63,7 @@ Camera::Camera() :
     }
     cout << "Using camera with GUID " << dc1394Camera_->guid << endl;
 
-    capCam_.set(CV_CAP_PROP_BUFFERSIZE, RingBufSz);
+    capCam_.set(cv::CAP_PROP_BUFFERSIZE, RingBufSz);
     empty_ = false;
 }
 
@@ -79,7 +79,7 @@ Camera::~Camera()
 
 void Camera::setFPS(int fps)
 {
-    if(!capCam_.set(CV_CAP_PROP_FPS, fps))
+    if(!capCam_.set(cv::CAP_PROP_FPS, fps))
         cerr << "Couldn't set framerate" << endl;
 }
 
diff --git a/src/cameraworker.cpp b/src/cameraworker.cpp
index affcf09..a0e669b 100644
--- a/src/cameraworker.cpp
+++ b/src/cameraworker.cpp
@@ -55,7 +55,7 @@ CameraWorker::CameraWorker(CycDataBuffer* cycBuf, Camera &cam):
         QImage fixImg(":/img/fixPoint.png");
         cv::Mat fixMat = cv::Mat(fixImg.height(), fixImg.width(), CV_8UC4,
                                  fixImg.bits(), fixImg.bytesPerLine()).clone();
-        cv::cvtColor(fixMat, fixMat, CV_RGBA2BGRA);
+        cv::cvtColor(fixMat, fixMat, cv::COLOR_RGBA2BGRA);
 
         if(!fixMat.empty()) {
             cv::Point2i pos((VIDEO_WIDTH-fixMat.cols)/2,
@@ -101,7 +101,7 @@ void CameraWorker::captureFrame()
 
     // Process signals emitted by events_->applyEvents().
     QCoreApplication::processEvents();
-    cv::cvtColor(frame_, frame_, CV_BGR2RGB);
+    cv::cvtColor(frame_, frame_, cv::COLOR_BGR2RGB);
 
     ChunkAttrib chunkAttrib;
     strncpy(chunkAttrib.log, log_.toStdString().c_str(), MAXLOG);
diff --git a/src/event.cpp b/src/event.cpp
index aecfb13..00e05da 100644
--- a/src/event.cpp
+++ b/src/event.cpp
@@ -494,8 +494,8 @@ int MotionDetectorEvent::nChanges()
     cv::absdiff(prev_, next_, d1);
     cv::absdiff(current_, next_, d2);
     cv::bitwise_and(d1, d2, result_);
-    cv::cvtColor(result_, result_, CV_BGR2GRAY);
-    cv::threshold(result_, result_, 5, White, CV_THRESH_BINARY);
+    cv::cvtColor(result_, result_, cv::COLOR_BGR2GRAY);
+    cv::threshold(result_, result_, 5, White, cv::THRESH_BINARY);
     cv::erode(result_,result_,cv::Mat());
     cv::dilate(result_,result_,cv::Mat());
 
diff --git a/src/eventparser.cpp b/src/eventparser.cpp
index f952711..49ac1cc 100644
--- a/src/eventparser.cpp
+++ b/src/eventparser.cpp
@@ -20,7 +20,7 @@
 #include <iostream>
 #include <QStringList>
 #include <sys/ioctl.h>
-#include <opencv/highgui.h>
+#include <opencv2/highgui.hpp>
 
 #include "mainwindow.h"
 #include "eventparser.h"
@@ -149,7 +149,7 @@ bool EventParser::parseObject(const QString &str)
 
     if(attr.objectType_ == "image") {
         cv::Mat file(cv::imread(attr.fileName_.toStdString(),
-                                CV_LOAD_IMAGE_UNCHANGED));
+                                cv::IMREAD_UNCHANGED));
         if(file.empty()) {
             emit error(QString("Error: couldn't load image file '%1'.")
                        .arg(attr.fileName_));
diff --git a/src/glworker.cpp b/src/glworker.cpp
index 5f3bd2c..3e60b78 100644
--- a/src/glworker.cpp
+++ b/src/glworker.cpp
@@ -18,6 +18,7 @@
  */
 
 #include <iostream>
+#include <math.h>
 #include <QCoreApplication>
 #include <QWindow>
 
diff --git a/src/src.pro b/src/src.pro
index 850498e..58e30ce 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -75,7 +75,7 @@ FORMS += mainwindow.ui \
     videodialog.ui \
     motiondialog.ui
 
-PKGCONFIG += opencv
+PKGCONFIG += opencv4
 LIBS += -ldc1394 -ljpeg
 
 QMAKE_CXXFLAGS += -std=c++11
diff --git a/tests/tests.pro b/tests/tests.pro
index 4655949..1f99f5c 100644
--- a/tests/tests.pro
+++ b/tests/tests.pro
@@ -28,7 +28,7 @@ else {
     CONFIG+=qtestlib
 }
 
-PKGCONFIG += opencv
+PKGCONFIG += opencv4
 LIBS += -L../lib -lvidman_debug -ldc1394 -ljpeg
 
 QMAKE_CXXFLAGS += -std=c++11