diff --git a/dotnet/CHANGELOG b/dotnet/CHANGELOG
index 688eccb730373..eebfa923a01af 100644
--- a/dotnet/CHANGELOG
+++ b/dotnet/CHANGELOG
@@ -1,3 +1,11 @@
+v4.21.0
+======
+
+>>> [dotnet] Overwrite internal log file if it already exists (#13900)
+* [dotnet] Optionally overwrite internal log file if it already exists
+* Overwrite log file by default
+>>> [dotnet] Align binary location property for FirefoxOptions with other options (#13901)
+
 v4.20.0
 ======
 
diff --git a/dotnet/selenium-dotnet-version.bzl b/dotnet/selenium-dotnet-version.bzl
index 58079d01b5826..9a37fbbeeeaed 100644
--- a/dotnet/selenium-dotnet-version.bzl
+++ b/dotnet/selenium-dotnet-version.bzl
@@ -1,6 +1,6 @@
 # BUILD FILE SYNTAX: STARLARK
 
-SE_VERSION = "4.21.0-nightly202404242344"
+SE_VERSION = "4.21.0"
 ASSEMBLY_VERSION = "4.0.0.0"
 SUPPORTED_NET_STANDARD_VERSIONS = ["netstandard2.0"]
 
diff --git a/java/CHANGELOG b/java/CHANGELOG
index 71a9dd18c09b8..6c8fb81814b4f 100644
--- a/java/CHANGELOG
+++ b/java/CHANGELOG
@@ -1,3 +1,53 @@
+v4.21.0
+======
+
+>>> [bidi][java] Add methods to allow all parameters for script callFunction and evaluate method (#13873)
+>>> [java] Setting a connection timeout for the WS connection
+Fixes #13884
+>>> [java] Improving error message for BiDi connection
+Either when `webSocketUrl` is not set or the
+browser version does not support BiDi.
+Related to #13896
+[skip ci]
+>>> [java] Improving logging to understand why "Value must be set" is raised.
+>>> [grid] flatten combined routes to improve routing (#13856)
+>>> [grid][java]: apply protocol version in relay session factory (#13880)
+>>> [java][sm] Configure Selenium Manager environment from System Properties (#13858)
+* [java][sm] Configure Selenium Manager environment from System Properties
+* Running format script
+>>> [java][grid]: Set test name to video file name in dynamic grid (#13907)
+* [java][grid]: Set test name to video file name in dynamic grid
+* Revert unexpected changes
+>>> [grid][java]: session-timeout set connection timeout in RemoteNode (#13854)
+* [grid][java]: add session-timeout to all kind of Nodes
+* [grid][java]: fix code as suggestions
+* [java][grid]: update test CustomNode can get/set sessionTimeout
+>>> [java] type casting and numeric improvements (#13909)
+* replaced condition controll flow with switch
+* remove casting from double to int
+division operation with integer ergument is equal to cast to int Math.floor()
+* remove division by 1 in tests
+* replaced manual calculation of hashcode with Long.hashCode()
+* removed redundand toString method call
+* removed cast to string in string concat
+* applying code formatting
+>>> [cdp][java] Allow filters to recover from failed requests in NetworkInterceptor (#13847)
+>>> [java] allow a DevTools listener to determinate the order of handler calls (#13921)
+>>> [java] read selenium manager output as UTF-8 #13653
+>>> [java] Reduce redundant toString() calls (#13932)
+* removed unnecessary semicolons
+* removed redundant access modifier for interface member
+* removed redundant toString() calls for id in RedisBackedSessionMap
+* removed redundant toString() call in DragAndDropTest
+* removed redundant toString() calls
+* applying formatting
+>>> [java] fixed format of expires in Cookie.toString #13927
+>>> [java] Fixing JavaDocs for driver classes
+>>> [grid] Using MutableCapabilities to get rid of browserVersion
+And later returning them as PersistentCapabilities
+Also, restoring the null check in PersistentCapabilities.java
+Fixes #13937
+
 v4.20.0
 ======
 
diff --git a/java/version.bzl b/java/version.bzl
index 84652c8472fa7..a1513b1db28ae 100644
--- a/java/version.bzl
+++ b/java/version.bzl
@@ -1,2 +1,2 @@
-SE_VERSION = "4.21.0-SNAPSHOT"
+SE_VERSION = "4.21.0"
 TOOLS_JAVA_VERSION = "17"
diff --git a/javascript/node/selenium-webdriver/CHANGES.md b/javascript/node/selenium-webdriver/CHANGES.md
index dea4b231d4275..36d5d73a65be0 100644
--- a/javascript/node/selenium-webdriver/CHANGES.md
+++ b/javascript/node/selenium-webdriver/CHANGES.md
@@ -1,3 +1,18 @@
+## 4.21.0
+
+>>> [js] Setting nightly version
+>>> [js] Fixing wrongly updated package-lock.json
+>>> [bazel + js] Allow `bazel build //javascript/...` to work (#13893)
+* [bazel + js] Allow `bazel build //javascript/...` to work
+* cp: hackity hack
+* Reorganise the build file
+>>> [js] Ensure 'selectVisibleByText' method is same as other languages (#13899)
+>>> [js] Ensure parity in the locators used by methods (#13902)
+>>> [js] Updating README.md
+Fixes #13940
+[slip ci]
+>>> [js] Running format script
+
 ## 4.20.0
 
 - Add CDP for Chrome 124 and remove 121
diff --git a/javascript/node/selenium-webdriver/package.json b/javascript/node/selenium-webdriver/package.json
index d48c4ed5f3e55..71e0e23fb635b 100644
--- a/javascript/node/selenium-webdriver/package.json
+++ b/javascript/node/selenium-webdriver/package.json
@@ -1,6 +1,6 @@
 {
   "name": "selenium-webdriver",
-  "version": "4.21.0-nightly202404242350",
+  "version": "4.21.0",
   "description": "The official WebDriver JavaScript bindings from the Selenium project",
   "license": "Apache-2.0",
   "keywords": [
diff --git a/package-lock.json b/package-lock.json
index 82f036fee7fe6..991c9ed1b04ae 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1874,7 +1874,7 @@
       "license": "ISC"
     },
     "javascript/node/selenium-webdriver": {
-      "version": "4.21.0-nightly202404242350",
+      "version": "4.21.0",
       "license": "Apache-2.0",
       "dependencies": {
         "jszip": "^3.10.1",
diff --git a/py/BUILD.bazel b/py/BUILD.bazel
index 746e5eaa4a80b..380c885463413 100644
--- a/py/BUILD.bazel
+++ b/py/BUILD.bazel
@@ -40,7 +40,7 @@ compile_pip_requirements(
     ],
 )
 
-SE_VERSION = "4.21.0.dev202404242345"
+SE_VERSION = "4.21.0"
 
 BROWSER_VERSIONS = [
     "v85",
diff --git a/py/CHANGES b/py/CHANGES
index 90e63496b8d08..b4f410fee8ae9 100644
--- a/py/CHANGES
+++ b/py/CHANGES
@@ -1,3 +1,13 @@
+Selenium 4.21.0
+
+>>> [py] Setting nightly version
+>>> [py] removed unused logger object from `firefox/webdriver.py` (#13892)
+[py] removed unused logger object from firefox/webdriver.py
+>>> Moving ignore_local_proxy_environment_variables to BaseOptions (#13926)
+* Moving ignore_local_proxy_environment_variables to BaseOptions
+* Just moving instead of deprecating
+* Invoking method instead of property
+
 Selenium 4.20.0
 
 * Add CDP for Chrome 124 and remove 121
diff --git a/py/docs/source/conf.py b/py/docs/source/conf.py
index d2bdb487c0a70..a3c3c65d5f57d 100644
--- a/py/docs/source/conf.py
+++ b/py/docs/source/conf.py
@@ -58,7 +58,7 @@
 # The short X.Y version.
 version = '4.21'
 # The full version, including alpha/beta/rc tags.
-release = '4.21.0.dev202404242345'
+release = '4.21.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/py/selenium/__init__.py b/py/selenium/__init__.py
index bc9c37bd212e5..74cb2777367c6 100644
--- a/py/selenium/__init__.py
+++ b/py/selenium/__init__.py
@@ -16,4 +16,4 @@
 # under the License.
 
 
-__version__ = "4.21.0.dev202404242345"
+__version__ = "4.21.0"
diff --git a/py/selenium/webdriver/__init__.py b/py/selenium/webdriver/__init__.py
index f9304b14f5aa0..dd31331a2f45d 100644
--- a/py/selenium/webdriver/__init__.py
+++ b/py/selenium/webdriver/__init__.py
@@ -44,7 +44,7 @@
 from .wpewebkit.service import Service as WPEWebKitService  # noqa
 from .wpewebkit.webdriver import WebDriver as WPEWebKit  # noqa
 
-__version__ = "4.21.0.dev202404242345"
+__version__ = "4.21.0"
 
 # We need an explicit __all__ because the above won't otherwise be exported.
 __all__ = [
diff --git a/py/setup.py b/py/setup.py
index 14f86dcaa53ba..697301d371927 100755
--- a/py/setup.py
+++ b/py/setup.py
@@ -27,7 +27,7 @@
 setup_args = {
     'cmdclass': {'install': install},
     'name': 'selenium',
-    'version': "4.21.0.dev202404242345",
+    'version': "4.21.0",
     'license': 'Apache 2.0',
     'description': 'Python bindings for Selenium',
     'long_description': open(join(abspath(dirname(__file__)), "README.rst")).read(),
diff --git a/rb/CHANGES b/rb/CHANGES
index aa272a7036a90..844971fd04a11 100644
--- a/rb/CHANGES
+++ b/rb/CHANGES
@@ -1,3 +1,15 @@
+4.21.0 (2024-05-15)
+=========================
+
+>>> [rb] Setting nightly version
+>>> [rb] Return and deprecate DriverFinder.path
+This was accidentally removed in #13386.
+Fixes #13876.
+Related to rails/rails#51658.
+>>> [rb] Release 4.20.1
+>>> [rb] Update version for nightly
+>>> [rb] Use Bazel JDK in remote tests
+
 4.20.1 (2024-04-25)
 =========================
 
diff --git a/rb/Gemfile.lock b/rb/Gemfile.lock
index f6ee830661149..1c7443d03d5e0 100644
--- a/rb/Gemfile.lock
+++ b/rb/Gemfile.lock
@@ -3,7 +3,7 @@ PATH
   specs:
     selenium-devtools (0.124.0)
       selenium-webdriver (~> 4.2)
-    selenium-webdriver (4.21.0.nightly)
+    selenium-webdriver (4.21.0)
       base64 (~> 0.2)
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 3.0)
@@ -27,8 +27,8 @@ GEM
       public_suffix (>= 2.0.2, < 6.0)
     ast (2.4.2)
     base64 (0.2.0)
-    bigdecimal (3.1.7)
-    bigdecimal (3.1.7-java)
+    bigdecimal (3.1.8)
+    bigdecimal (3.1.8-java)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
     crack (1.0.0)
@@ -41,19 +41,17 @@ GEM
     diff-lcs (1.5.1)
     drb (2.2.1)
     ffi (1.16.3)
-    ffi (1.16.3-java)
-    ffi (1.16.3-x64-mingw32)
     fileutils (1.7.2)
     git (1.19.1)
       addressable (~> 2.8)
       rchardet (~> 1.8)
     hashdiff (1.1.0)
-    i18n (1.14.4)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     io-console (0.7.2)
     io-console (0.7.2-java)
-    irb (1.12.0)
-      rdoc
+    irb (1.13.1)
+      rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     jar-dependencies (0.4.1)
     json (2.7.2)
@@ -66,7 +64,7 @@ GEM
     minitest (5.22.3)
     mutex_m (0.2.0)
     parallel (1.24.0)
-    parser (3.3.0.5)
+    parser (3.3.1.0)
       ast (~> 2.4.1)
       racc
     psych (5.1.2)
@@ -87,8 +85,8 @@ GEM
     rchardet (1.8.0)
     rdoc (6.6.3.1)
       psych (>= 4.0.0)
-    regexp_parser (2.9.0)
-    reline (0.5.3)
+    regexp_parser (2.9.1)
+    reline (0.5.7)
       io-console (~> 0.5)
     rexml (3.2.6)
     rspec (3.13.0)
@@ -100,11 +98,11 @@ GEM
     rspec-expectations (3.13.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.0)
+    rspec-mocks (3.13.1)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.1)
-    rubocop (1.63.3)
+    rubocop (1.63.5)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
@@ -115,8 +113,8 @@ GEM
       rubocop-ast (>= 1.31.1, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.31.2)
-      parser (>= 3.3.0.4)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
     rubocop-capybara (2.20.0)
       rubocop (~> 1.41)
     rubocop-factory_bot (2.25.1)
@@ -124,7 +122,7 @@ GEM
     rubocop-performance (1.21.0)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
-    rubocop-rspec (2.29.1)
+    rubocop-rspec (2.29.2)
       rubocop (~> 1.40)
       rubocop-capybara (~> 2.17)
       rubocop-factory_bot (~> 2.22)
diff --git a/rb/lib/selenium/webdriver/version.rb b/rb/lib/selenium/webdriver/version.rb
index 7dab164bc68b8..ae5674c3ea5df 100644
--- a/rb/lib/selenium/webdriver/version.rb
+++ b/rb/lib/selenium/webdriver/version.rb
@@ -19,6 +19,6 @@
 
 module Selenium
   module WebDriver
-    VERSION = '4.21.0.nightly'
+    VERSION = '4.21.0'
   end # WebDriver
 end # Selenium
diff --git a/rust/CHANGELOG.md b/rust/CHANGELOG.md
index a8927558bc665..bb532e7dcea86 100644
--- a/rust/CHANGELOG.md
+++ b/rust/CHANGELOG.md
@@ -1,3 +1,7 @@
+0.4.21
+======
+
+
 0.4.20
 ======