diff --git a/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown b/doc/tutorials/introduction/cross_referencing/tutorial_cross_referencing.markdown
index 4908771aec0d4249793d9593dcc04fcf51e55c44..74935606354745d1c82614daa204dbd7d77a83b4 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/4.5.2
+TAGFILES = ./docs/doxygen-tags/opencv.tag=http://docs.opencv.org/4.5.3
 @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/4.5.2
+           ./docs/doxygen-tags/opencv.tag=http://docs.opencv.org/4.5.3
 @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 ad6c36157736fd747b5bf531b39377cb5e776730..4757e30f9b30dc8986fc70ad10afc0b53d65e24f 100644
--- a/modules/core/include/opencv2/core/version.hpp
+++ b/modules/core/include/opencv2/core/version.hpp
@@ -7,8 +7,8 @@
 
 #define CV_VERSION_MAJOR    4
 #define CV_VERSION_MINOR    5
-#define CV_VERSION_REVISION 2
-#define CV_VERSION_STATUS   "-dev"
+#define CV_VERSION_REVISION 3
+#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 43191b89837a87d6217e0baf7847e0f020ad7806..0efc9c023765914633dd4b05a1989bdf6d0e3be4 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 20210301
+#define OPENCV_DNN_API_VERSION 20210608
 
 #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 ddb8ca70b09268b6a5f4843c9b43bf5f4f538d46..cb585aa80a2dff66512e0cc9e82388bb9c8cda90 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', '4.5.2')  # TODO
+    package_version = os.environ.get('OPENCV_VERSION', '4.5.3')  # 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 efb234fa03938facc3bbc63ab2e18445c580ec57..1166eee2fb162216ba55bc6e0e709a44ce066921 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>4.5.2</version>
+        <version>4.5.3</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 ca95f4b74d6fcb7dffa899edd04c29c3cec737d4..4ac2c2b7f5c4d44ff9c627383c296016832dd5d6 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>4.5.2</version>
+        <version>4.5.3</version>
     </parent>
     <groupId>org.opencv</groupId>
     <artifactId>opencv</artifactId>
diff --git a/platforms/maven/pom.xml b/platforms/maven/pom.xml
index 42de60ab09ee8637aeb4e783f1f85b875da326cc..72f4f82b1ce1dcfb21ec72bf15e958763f857382 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>4.5.2</version>
+    <version>4.5.3</version>
     <packaging>pom</packaging>
     <name>OpenCV Parent POM</name>
     <licenses>