diff --git a/3rdparty/windows/getCaffe.bat b/3rdparty/windows/getCaffe.bat
index 0bbeab7898af6e0fff9548a734e5eaff627111d8..e3d17ccdb3417be19f524f78d2afe24fd47a3da9 100644
--- a/3rdparty/windows/getCaffe.bat
+++ b/3rdparty/windows/getCaffe.bat
@@ -7,7 +7,7 @@ SET WGET_EXE=wget\wget.exe
 :: Download temporary zip
 echo ----- Downloading Caffe -----
 SET CAFEE_FOLDER=caffe\
-SET ZIP_NAME=caffe_15_2019_03_14.zip
+SET ZIP_NAME=caffe_15_2019_05_16.zip
 SET ZIP_FULL_PATH=%CAFEE_FOLDER%%ZIP_NAME%
 %WGET_EXE% -c http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/%ZIP_NAME% -P %CAFEE_FOLDER%
 echo:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e75a2d0ff5265c06bb4cd0771c6fb4c0cf6f3c4..881e8667da3bb38a3a1bc17a3a5bbd1c405bea82 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -554,7 +554,7 @@ if (WIN32)
     download_zip("caffe_cpu_2018_05_27.zip" ${OP_WIN_URL} ${FIND_LIB_PREFIX} 87E8401B6DFBAC5B8E909DD20E3B3390)
   else (${GPU_MODE} MATCHES "OPENCL")
     # download_zip("caffe_2019_03_12.zip" ${OP_WIN_URL} ${FIND_LIB_PREFIX} 859a592310f0928fd4f40da1456a217f)
-    download_zip("caffe_15_2019_03_14.zip" ${OP_WIN_URL} ${FIND_LIB_PREFIX} f2d8beee9e4959fa419dcb54d507107c)
+    download_zip("caffe_15_2019_05_16.zip" ${OP_WIN_URL} ${FIND_LIB_PREFIX} f2d8beee9e4959fa419dcb54d507107c)
   endif (${GPU_MODE} MATCHES "OPENCL")
   if (WITH_3D_RENDERER)
     download_zip("freeglut_2018_01_14.zip" ${OP_WIN_URL} ${FIND_LIB_PREFIX} BB182187285E06880F0EDE3A39530091)
diff --git a/doc/installation_deprecated.md b/doc/installation_deprecated.md
index 094e9b314d325fd5ade5654bd4c0d1a3d2744c81..1df3a30befa2fe71375a8c25e9381bdba531ab85 100644
--- a/doc/installation_deprecated.md
+++ b/doc/installation_deprecated.md
@@ -139,7 +139,7 @@ Note: This installer will not incorporate any new features, we recommend to use
         - [Face model](http://posefs1.perception.cs.cmu.edu/OpenPose/models/face/pose_iter_116000.caffemodel): download in `models/face/`.
         - [Hands model](http://posefs1.perception.cs.cmu.edu/OpenPose/models/hand/pose_iter_102000.caffemodel): download in `models/hand/`.
     - Dependencies:
-        - [Caffe](http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/caffe_15_2019_03_14.zip): Unzip as `3rdparty/windows/caffe/`.
+        - [Caffe](http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/caffe_15_2019_05_16.zip): Unzip as `3rdparty/windows/caffe/`.
         - [Caffe dependencies](http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/caffe3rdparty_15_2019_03_14.zip): Unzip as `3rdparty/windows/caffe3rdparty/`.
         - [OpenCV 4.0.1](http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/opencv_401_v14_15_2019_03_14.zip): Unzip as `3rdparty/windows/opencv/`.
 2. Open the Visual Studio project sln file by double-cliking on `{openpose_path}\windows\OpenPose.sln`.
diff --git a/doc/prerequisites.md b/doc/prerequisites.md
index 9e03c94ae60d3cbc3dee236e669c58fc71a55502..0e9352fad588004d5a3be8606b7fcdd2cd44c610 100644
--- a/doc/prerequisites.md
+++ b/doc/prerequisites.md
@@ -98,7 +98,7 @@ NOTE: These instructions are only required when compiling OpenPose brom source.
     - CMake automatically downloads all the Windows DLLs. Alternatively, you might prefer to download them manually:
         - Dependencies:
             - Note: Leave the zip files in `3rdparty/windows/` so that CMake does not try to download them again.
-            - [Caffe](http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/caffe_15_2019_03_14.zip): Unzip as `3rdparty/windows/caffe/`.
+            - [Caffe](http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/caffe_15_2019_05_16.zip): Unzip as `3rdparty/windows/caffe/`.
             - [Caffe dependencies](http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/caffe3rdparty_15_2019_03_14.zip): Unzip as `3rdparty/windows/caffe3rdparty/`.
             - [OpenCV 4.0.1](http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/opencv_401_v14_15_2019_03_14.zip): Unzip as `3rdparty/windows/opencv/`.
 6. **Eigen prerequisite** (optional, only required for some specific extra functionality, such as extrinsic camera calibration):
diff --git a/src/openpose/gui/gui3D.cpp b/src/openpose/gui/gui3D.cpp
index 1ffeac0b30002743539573c01d2733cc28b25c3d..f5f4a3b98d6b43a1ce4f58adb923de09668e97a2 100644
--- a/src/openpose/gui/gui3D.cpp
+++ b/src/openpose/gui/gui3D.cpp
@@ -569,7 +569,11 @@ namespace op
                     if (mCopyGlToCvMat)
                     {
                         image = cv::Mat(WINDOW_HEIGHT, WINDOW_WIDTH, CV_8UC3);
-                        glReadPixels(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, GL_BGR, GL_UNSIGNED_BYTE, image.data);
+                        #ifdef _WIN32
+                            glReadPixels(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, GL_BGR_EXT, GL_UNSIGNED_BYTE, image.data);
+                        #else
+                            glReadPixels(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, GL_BGR, GL_UNSIGNED_BYTE, image.data);
+                        #endif
                         cv::flip(image, image, 0);
                     }
                 }
diff --git a/src/openpose/producer/spinnakerWrapper.cpp b/src/openpose/producer/spinnakerWrapper.cpp
index c08257cb64126a18851fdabe59ef64898a0ba9bb..8cd746c100ac6d889fbe9f6787d40d64ccf85156 100644
--- a/src/openpose/producer/spinnakerWrapper.cpp
+++ b/src/openpose/producer/spinnakerWrapper.cpp
@@ -1,6 +1,10 @@
+#include <openpose/core/macros.hpp> // OPEN_CV_IS_4_OR_HIGHER
 #include <atomic>
 #include <mutex>
 #include <opencv2/imgproc/imgproc.hpp> // cv::undistort, cv::initUndistortRectifyMap
+#ifdef OPEN_CV_IS_4_OR_HIGHER
+    #include <opencv2/calib3d.hpp> // cv::initUndistortRectifyMap for OpenCV 4
+#endif
 #ifdef USE_FLIR_CAMERA
     #include <Spinnaker.h>
 #endif