diff --git a/doc/tutorials/dnn/dnn_android/dnn_android.markdown b/doc/tutorials/dnn/dnn_android/dnn_android.markdown
index 46149daae46df37f1de9a423d2b6f0df7d5ebb5f..7000a493a9adf0fc4917a8a73021ae03e87f113d 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-4.4.0-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-4.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/cross_referencing/tutorial_cross_referencing.markdown b/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown
index 6391acada57b2bc43d195ea3efc2d4e3a0d1a3f8..b6459db0c122e0c9b4150a4cf7f5c596e0ccbd45 100644
--- a/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown
+++ b/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown
@@ -39,14 +39,14 @@ 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/4.4.0
+TAGFILES = ./docs/doxygen-tags/opencv.tag=http://docs.opencv.org/4.5.0
 @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/4.4.0
+           ./docs/doxygen-tags/opencv.tag=http://docs.opencv.org/4.5.0
 @endcode
 
 Doxygen can now use the information from the tag file to link to the OpenCV
diff --git a/modules/core/include/opencv2/core/version.hpp b/modules/core/include/opencv2/core/version.hpp
index 2e097aece3864ae7dc14b20d61febbb9e2ae547c..7026fad88f27e96e5a3fcf8ac3de9f55d85fcdd5 100644
--- a/modules/core/include/opencv2/core/version.hpp
+++ b/modules/core/include/opencv2/core/version.hpp
@@ -6,9 +6,9 @@
 #define OPENCV_VERSION_HPP
 
 #define CV_VERSION_MAJOR    4
-#define CV_VERSION_MINOR    4
+#define CV_VERSION_MINOR    5
 #define CV_VERSION_REVISION 0
-#define CV_VERSION_STATUS   "-dev"
+#define CV_VERSION_STATUS   "-pre"
 
 #define CVAUX_STR_EXP(__A)  #__A
 #define CVAUX_STR(__A)      CVAUX_STR_EXP(__A)
diff --git a/modules/dnn/include/opencv2/dnn/version.hpp b/modules/dnn/include/opencv2/dnn/version.hpp
index 1b8796e252aa11bf25440996767e3fb07450e827..f91b44d142b499c95659ffa3edf5a658468b4613 100644
--- a/modules/dnn/include/opencv2/dnn/version.hpp
+++ b/modules/dnn/include/opencv2/dnn/version.hpp
@@ -6,7 +6,7 @@
 #define OPENCV_DNN_VERSION_HPP
 
 /// Use with major OpenCV version only.
-#define OPENCV_DNN_API_VERSION 20200609
+#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)
diff --git a/modules/python/package/setup.py b/modules/python/package/setup.py
index 5008ace59dd3e631951c4fb7fbf0a1cbdd96ec80..f00f683a45423ba2b67cfeb850b2441e257f4bf0 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', '4.4.0')  # TODO
+    package_version = os.environ.get('OPENCV_VERSION', '4.5.0')  # TODO
 
     long_description = 'Open Source Computer Vision Library Python bindings'  # TODO
 
diff --git a/platforms/maven/opencv-it/pom.xml b/platforms/maven/opencv-it/pom.xml
index 211f0bbfbb58fe5e1a9a3302f58825ab0acdb29a..ee689af10496731330d6a66be696910547e6bd1c 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>4.4.0</version>
+        <version>4.5.0</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 c20228a6055e32544c07c3cbcd345ee59d2a7ef6..d9c63ac1a8856ac0ee5737fbd023f9a7ee6e3b28 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>4.4.0</version>
+        <version>4.5.0</version>
     </parent>
     <groupId>org.opencv</groupId>
     <artifactId>opencv</artifactId>
diff --git a/platforms/maven/pom.xml b/platforms/maven/pom.xml
index c0bff47de701dd7ec462dc173893d895f1b89a5e..322de22c386d452c0a77945021ed6d624e3eeab1 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>4.4.0</version>
+    <version>4.5.0</version>
     <packaging>pom</packaging>
     <name>OpenCV Parent POM</name>
     <licenses>