diff --git a/cmake/OpenCVGenPkgconfig.cmake b/cmake/OpenCVGenPkgconfig.cmake
index 43d6a87e74..e608d61a65 100644
--- a/cmake/OpenCVGenPkgconfig.cmake
+++ b/cmake/OpenCVGenPkgconfig.cmake
@@ -45,7 +45,7 @@ if(NOT DEFINED CMAKE_HELPER_SCRIPT)
 if(INSTALL_TO_MANGLED_PATHS)
   ocv_update(OPENCV_PC_FILE_NAME "opencv-${OPENCV_VERSION}.pc")
 else()
-  ocv_update(OPENCV_PC_FILE_NAME opencv4.pc)
+  ocv_update(OPENCV_PC_FILE_NAME opencv5.pc)
 endif()
 
 # build the list of opencv libs and dependencies for all modules
diff --git a/cmake/OpenCVGenSetupVars.cmake b/cmake/OpenCVGenSetupVars.cmake
index 2cf238714f..8fce8a01d5 100644
--- a/cmake/OpenCVGenSetupVars.cmake
+++ b/cmake/OpenCVGenSetupVars.cmake
@@ -15,7 +15,7 @@ endif()
 if(INSTALL_TO_MANGLED_PATHS)
   ocv_update(OPENCV_SETUPVARS_FILENAME "setup_vars_opencv-${OPENCV_VERSION}${OPENCV_SCRIPT_EXTENSION}")
 else()
-  ocv_update(OPENCV_SETUPVARS_FILENAME setup_vars_opencv4${OPENCV_SCRIPT_EXTENSION})
+  ocv_update(OPENCV_SETUPVARS_FILENAME setup_vars_opencv5${OPENCV_SCRIPT_EXTENSION})
 endif()
 
 ##### build directory
diff --git a/cmake/OpenCVInstallLayout.cmake b/cmake/OpenCVInstallLayout.cmake
index d5f35798dc..8c66622ed0 100644
--- a/cmake/OpenCVInstallLayout.cmake
+++ b/cmake/OpenCVInstallLayout.cmake
@@ -64,15 +64,15 @@ else() # UNIX
   ocv_update(OPENCV_SAMPLES_BIN_INSTALL_PATH   "${OPENCV_BIN_INSTALL_PATH}")
   ocv_update(OPENCV_LIB_INSTALL_PATH           "${CMAKE_INSTALL_LIBDIR}")
   ocv_update(OPENCV_LIB_ARCHIVE_INSTALL_PATH   "${OPENCV_LIB_INSTALL_PATH}")
-  ocv_update(OPENCV_3P_LIB_INSTALL_PATH        "${OPENCV_LIB_INSTALL_PATH}/opencv4/3rdparty")
-  ocv_update(OPENCV_CONFIG_INSTALL_PATH        "${OPENCV_LIB_INSTALL_PATH}/cmake/opencv4")
-  ocv_update(OPENCV_INCLUDE_INSTALL_PATH       "${CMAKE_INSTALL_INCLUDEDIR}/opencv4")
-  ocv_update(OPENCV_OTHER_INSTALL_PATH         "${CMAKE_INSTALL_DATAROOTDIR}/opencv4")
+  ocv_update(OPENCV_3P_LIB_INSTALL_PATH        "${OPENCV_LIB_INSTALL_PATH}/opencv5/3rdparty")
+  ocv_update(OPENCV_CONFIG_INSTALL_PATH        "${OPENCV_LIB_INSTALL_PATH}/cmake/opencv5")
+  ocv_update(OPENCV_INCLUDE_INSTALL_PATH       "${CMAKE_INSTALL_INCLUDEDIR}/opencv5")
+  ocv_update(OPENCV_OTHER_INSTALL_PATH         "${CMAKE_INSTALL_DATAROOTDIR}/opencv5")
   ocv_update(OPENCV_SAMPLES_SRC_INSTALL_PATH   "${OPENCV_OTHER_INSTALL_PATH}/samples")
-  ocv_update(OPENCV_LICENSES_INSTALL_PATH      "${CMAKE_INSTALL_DATAROOTDIR}/licenses/opencv4")
+  ocv_update(OPENCV_LICENSES_INSTALL_PATH      "${CMAKE_INSTALL_DATAROOTDIR}/licenses/opencv5")
   ocv_update(OPENCV_TEST_DATA_INSTALL_PATH     "${OPENCV_OTHER_INSTALL_PATH}/testdata")
-  ocv_update(OPENCV_DOC_INSTALL_PATH           "${CMAKE_INSTALL_DATAROOTDIR}/doc/opencv4")
-  ocv_update(OPENCV_JAR_INSTALL_PATH           "${CMAKE_INSTALL_DATAROOTDIR}/java/opencv4")
+  ocv_update(OPENCV_DOC_INSTALL_PATH           "${CMAKE_INSTALL_DATAROOTDIR}/doc/opencv5")
+  ocv_update(OPENCV_JAR_INSTALL_PATH           "${CMAKE_INSTALL_DATAROOTDIR}/java/opencv5")
   ocv_update(OPENCV_JNI_INSTALL_PATH           "${OPENCV_JAR_INSTALL_PATH}")
   ocv_update(OPENCV_JNI_BIN_INSTALL_PATH       "${OPENCV_JNI_INSTALL_PATH}")
 
diff --git a/cmake/OpenCVPackaging.cmake b/cmake/OpenCVPackaging.cmake
index 7ce7efa661..f48e0b0943 100644
--- a/cmake/OpenCVPackaging.cmake
+++ b/cmake/OpenCVPackaging.cmake
@@ -144,9 +144,9 @@ set(CPACK_COMPONENT_PYTHON_CONFLICTS python-opencv)
 set(CPACK_COMPONENT_PYTHON_PROVIDES python-opencv)
 set(CPACK_COMPONENT_PYTHON_REPLACES python-opencv)
 
-set(CPACK_COMPONENT_JAVA_CONFLICTS "libopencv4.0-java, libopencv4.0-jni")
-set(CPACK_COMPONENT_JAVA_PROVIDES "libopencv4.0-java, libopencv4.0-jni")
-set(CPACK_COMPONENT_JAVA_REPLACES "libopencv4.0-java, libopencv4.0-jni")
+set(CPACK_COMPONENT_JAVA_CONFLICTS "libopencv5.0-java, libopencv5.0-jni")
+set(CPACK_COMPONENT_JAVA_PROVIDES "libopencv5.0-java, libopencv5.0-jni")
+set(CPACK_COMPONENT_JAVA_REPLACES "libopencv5.0-java, libopencv5.0-jni")
 
 set(CPACK_COMPONENT_DOCS_CONFLICTS opencv-doc)
 set(CPACK_COMPONENT_SAMPLES_CONFLICTS opencv-doc)
diff --git a/doc/tutorials/dnn/dnn_android/dnn_android.markdown b/doc/tutorials/dnn/dnn_android/dnn_android.markdown
index 7000a493a9..04520245da 100644
--- a/doc/tutorials/dnn/dnn_android/dnn_android.markdown
+++ b/doc/tutorials/dnn/dnn_android/dnn_android.markdown
@@ -15,7 +15,7 @@ Tutorial was written for the following versions of corresponding software:
 
 - Download and install Android Studio from https://developer.android.com/studio.
 
-- Get the latest pre-built OpenCV for Android release from https://github.com/opencv/opencv/releases and unpack it (for example, `opencv-4.X.Y-android-sdk.zip`).
+- Get the latest pre-built OpenCV for Android release from https://github.com/opencv/opencv/releases and unpack it (for example, `opencv-5.X.Y-android-sdk.zip`).
 
 - Download MobileNet object detection model from https://github.com/chuanqi305/MobileNet-SSD. We need a configuration file `MobileNetSSD_deploy.prototxt` and weights `MobileNetSSD_deploy.caffemodel`.
 
diff --git a/doc/tutorials/introduction/config_reference/config_reference.markdown b/doc/tutorials/introduction/config_reference/config_reference.markdown
index 5107af6a8a..196eb42ac0 100644
--- a/doc/tutorials/introduction/config_reference/config_reference.markdown
+++ b/doc/tutorials/introduction/config_reference/config_reference.markdown
@@ -524,7 +524,7 @@ Following options can be used to change installation layout for common scenarios
 | Option | Default | Description |
 | ------ | ------- | ----------- |
 | `INSTALL_CREATE_DISTRIB` | _OFF_ | Tune multiple things to produce Windows and Android distributions. |
-| `INSTALL_TO_MANGLED_PATHS` | _OFF_ | Adds one level to several installation locations to allow side-by-side installations. For example, headers will be installed to _/usr/include/opencv-4.4.0_ instead of _/usr/include/opencv4_ with this option enabled. |
+| `INSTALL_TO_MANGLED_PATHS` | _OFF_ | Adds one level to several installation locations to allow side-by-side installations. For example, headers will be installed to _/usr/include/opencv-5.x.y_ instead of _/usr/include/opencv5_ with this option enabled. |
 
 
 # Miscellaneous features {#tutorial_config_reference_misc}
diff --git a/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown b/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown
index 3c492aaaea..5e5d856819 100644
--- a/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown
+++ b/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown
@@ -46,14 +46,14 @@ Open your Doxyfile using your favorite text editor and search for the key
 `TAGFILES`. Change it as follows:
 
 @code
-TAGFILES = ./docs/doxygen-tags/opencv.tag=http://docs.opencv.org/4.5.0
+TAGFILES = ./docs/doxygen-tags/opencv.tag=http://docs.opencv.org/5.0.0
 @endcode
 
 If you had other definitions already, you can append the line using a `\`:
 
 @code
 TAGFILES = ./docs/doxygen-tags/libstdc++.tag=https://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen \
-           ./docs/doxygen-tags/opencv.tag=http://docs.opencv.org/4.5.0
+           ./docs/doxygen-tags/opencv.tag=http://docs.opencv.org/5.0.0
 @endcode
 
 Doxygen can now use the information from the tag file to link to the OpenCV
diff --git a/doc/tutorials/introduction/linux_install/linux_install.markdown b/doc/tutorials/introduction/linux_install/linux_install.markdown
index 5cd496d173..af06810cdd 100644
--- a/doc/tutorials/introduction/linux_install/linux_install.markdown
+++ b/doc/tutorials/introduction/linux_install/linux_install.markdown
@@ -113,9 +113,9 @@ Installation process only copies files to predefined locations and do minor patc
 By default OpenCV will be installed to the `/usr/local` directory, all files will be copied to following locations:
 * `/usr/local/bin` - executable files
 * `/usr/local/lib` - libraries (.so)
-* `/usr/local/cmake/opencv4` - cmake package
-* `/usr/local/include/opencv4` - headers
-* `/usr/local/share/opencv4` - other files (e.g. trained cascades in XML format)
+* `/usr/local/cmake/opencv5` - cmake package
+* `/usr/local/include/opencv5` - headers
+* `/usr/local/share/opencv5` - other files (e.g. trained cascades in XML format)
 
 Since `/usr/local` is owned by the root user, the installation should be performed with elevated privileges (`sudo`):
 @snippet linux_install_a.sh install
diff --git a/modules/core/src/utils/filesystem.cpp b/modules/core/src/utils/filesystem.cpp
index 9e606dcdbe..e75640b86b 100644
--- a/modules/core/src/utils/filesystem.cpp
+++ b/modules/core/src/utils/filesystem.cpp
@@ -503,7 +503,7 @@ cv::String getCacheDirectory(const char* sub_directory_name, const char* configu
             if (utils::fs::isDirectory(default_cache_path))
             {
                 cv::String default_cache_path_base = utils::fs::join(default_cache_path, "opencv");
-                default_cache_path = utils::fs::join(default_cache_path_base, CVAUX_STR(CV_VERSION_MAJOR) "." CVAUX_STR(CV_VERSION_MINOR) CV_VERSION_STATUS);
+                default_cache_path = utils::fs::join(default_cache_path_base, CVAUX_STR(CV_VERSION_MAJOR) ".x" CV_VERSION_STATUS);
                 if (utils::getConfigurationParameterBool("OPENCV_CACHE_SHOW_CLEANUP_MESSAGE", true)
                     && !utils::fs::isDirectory(default_cache_path))
                 {
diff --git a/modules/dnn/include/opencv2/dnn/version.hpp b/modules/dnn/include/opencv2/dnn/version.hpp
index f91b44d142..87c2a8e3bc 100644
--- a/modules/dnn/include/opencv2/dnn/version.hpp
+++ b/modules/dnn/include/opencv2/dnn/version.hpp
@@ -9,7 +9,7 @@
 #define OPENCV_DNN_API_VERSION 20200908
 
 #if !defined CV_DOXYGEN && !defined CV_STATIC_ANALYSIS && !defined CV_DNN_DONT_ADD_INLINE_NS
-#define CV__DNN_INLINE_NS __CV_CAT(dnn4_v, OPENCV_DNN_API_VERSION)
+#define CV__DNN_INLINE_NS __CV_CAT(dnn5_v, OPENCV_DNN_API_VERSION)
 #define CV__DNN_INLINE_NS_BEGIN namespace CV__DNN_INLINE_NS {
 #define CV__DNN_INLINE_NS_END }
 namespace cv { namespace dnn { namespace CV__DNN_INLINE_NS { } using namespace CV__DNN_INLINE_NS; }}
diff --git a/modules/python/package/setup.py b/modules/python/package/setup.py
index f00f683a45..d41606e644 100644
--- a/modules/python/package/setup.py
+++ b/modules/python/package/setup.py
@@ -9,7 +9,7 @@ def main():
     os.chdir(SCRIPT_DIR)
 
     package_name = 'opencv'
-    package_version = os.environ.get('OPENCV_VERSION', '4.5.0')  # TODO
+    package_version = os.environ.get('OPENCV_VERSION', '5.0.0')  # TODO
 
     long_description = 'Open Source Computer Vision Library Python bindings'  # TODO
 
diff --git a/modules/videoio/src/backend_plugin.cpp b/modules/videoio/src/backend_plugin.cpp
index 92c18e8e7b..ab82e099ca 100644
--- a/modules/videoio/src/backend_plugin.cpp
+++ b/modules/videoio/src/backend_plugin.cpp
@@ -211,6 +211,7 @@ public:
                 CV_LOG_INFO(NULL, "Video I/O: plugin is incompatible: " << lib->getName());
                 return;
             }
+#if 0  // FIXIT: OpenCV 5.0
             if (plugin_api_->api_header.opencv_version_major != CV_VERSION_MAJOR)
             {
                 CV_LOG_ERROR(NULL, "Video I/O: wrong OpenCV major version used by plugin '" << plugin_api_->api_header.api_description << "': " <<
@@ -232,6 +233,7 @@ public:
                 plugin_api_ = NULL;
                 return;
             }
+#endif
             // TODO Preview: add compatibility API/ABI checks
             CV_LOG_INFO(NULL, "Video I/O: loaded plugin '" << plugin_api_->api_header.api_description << "'");
         }
diff --git a/platforms/maven/opencv-it/pom.xml b/platforms/maven/opencv-it/pom.xml
index ee689af104..a9cd1c57e3 100644
--- a/platforms/maven/opencv-it/pom.xml
+++ b/platforms/maven/opencv-it/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.opencv</groupId>
         <artifactId>opencv-parent</artifactId>
-        <version>4.5.0</version>
+        <version>5.0.0</version>
     </parent>
     <groupId>org.opencv</groupId>
     <artifactId>opencv-it</artifactId>
diff --git a/platforms/maven/opencv/pom.xml b/platforms/maven/opencv/pom.xml
index d9c63ac1a8..0f4b8f8976 100644
--- a/platforms/maven/opencv/pom.xml
+++ b/platforms/maven/opencv/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.opencv</groupId>
         <artifactId>opencv-parent</artifactId>
-        <version>4.5.0</version>
+        <version>5.0.0</version>
     </parent>
     <groupId>org.opencv</groupId>
     <artifactId>opencv</artifactId>
diff --git a/platforms/maven/pom.xml b/platforms/maven/pom.xml
index 322de22c38..517095088e 100644
--- a/platforms/maven/pom.xml
+++ b/platforms/maven/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.opencv</groupId>
     <artifactId>opencv-parent</artifactId>
-    <version>4.5.0</version>
+    <version>5.0.0</version>
     <packaging>pom</packaging>
     <name>OpenCV Parent POM</name>
     <licenses>
diff --git a/samples/_winpack_build_sample.cmd b/samples/_winpack_build_sample.cmd
index 06081a8360..1ae1a1fffe 100644
--- a/samples/_winpack_build_sample.cmd
+++ b/samples/_winpack_build_sample.cmd
@@ -10,7 +10,7 @@
 setlocal
 
 SET SCRIPT_DIR=%~dp0
-SET "OPENCV_SETUPVARS_SCRIPT=setup_vars_opencv4.cmd"
+SET "OPENCV_SETUPVARS_SCRIPT=setup_vars_opencv5.cmd"
 SET "PACKAGE_BUILD_DIR=%SCRIPT_DIR%\..\..\build"
 IF NOT EXIST "%PACKAGE_BUILD_DIR%\%OPENCV_SETUPVARS_SCRIPT%" (
   :: Winpack DLDT
diff --git a/samples/_winpack_run_python_sample.cmd b/samples/_winpack_run_python_sample.cmd
index e7885801e2..8b4b18fa2e 100644
--- a/samples/_winpack_run_python_sample.cmd
+++ b/samples/_winpack_run_python_sample.cmd
@@ -2,7 +2,7 @@
 SETLOCAL
 
 SET SCRIPT_DIR=%~dp0
-SET "OPENCV_SETUPVARS_SCRIPT=setup_vars_opencv4.cmd"
+SET "OPENCV_SETUPVARS_SCRIPT=setup_vars_opencv5.cmd"
 SET "BUILD_DIR=%SCRIPT_DIR%\..\..\build"
 IF NOT EXIST "%BUILD_DIR%\%OPENCV_SETUPVARS_SCRIPT%" (
   :: Winpack DLDT