diff --git a/Rakefile b/Rakefile
index 0223e0b778bdc..8af9c6579628c 100644
--- a/Rakefile
+++ b/Rakefile
@@ -640,7 +640,12 @@ namespace :py do
       # to start doing nightly builds.
       new_version = old_version + ".dev#{Time.now.strftime("%Y%m%d%H%M")}"
     else
-      new_version = updated_version(old_version.gsub(/\.dev\d+$/, ''), arguments[:version])
+      if old_version.include?('.dev')
+        new_version = old_version.gsub(/\.dev\d+$/, '')
+      else
+        new_version = updated_version(old_version.gsub(/\.dev\d+$/, ''), arguments[:version])
+        new_version = new_version + ".dev#{Time.now.strftime("%Y%m%d%H%M")}"
+      end
     end
 
     ['py/setup.py',
@@ -658,7 +663,7 @@ namespace :py do
     text = File.read('py/docs/source/conf.py').gsub(old_short_version, new_short_version)
     File.open('py/docs/source/conf.py', "w") { |f| f.puts text }
 
-    Rake::Task['py:changelog'].invoke unless new_version.include?('nightly') || bump_nightly
+    Rake::Task['py:changelog'].invoke unless new_version.include?('.dev') || bump_nightly
   end
 
   desc 'Update Python Syntax'
diff --git a/java/version.bzl b/java/version.bzl
index 84bf4814f1279..9ded87646f9cf 100644
--- a/java/version.bzl
+++ b/java/version.bzl
@@ -1,2 +1,2 @@
-SE_VERSION = "4.19.0"
+SE_VERSION = "4.20.0-SNAPSHOT"
 TOOLS_JAVA_VERSION = "17"
diff --git a/py/BUILD.bazel b/py/BUILD.bazel
index 7b59c9bc2c795..256a08af86e89 100644
--- a/py/BUILD.bazel
+++ b/py/BUILD.bazel
@@ -40,7 +40,7 @@ compile_pip_requirements(
     ],
 )
 
-SE_VERSION = "4.19.0"
+SE_VERSION = "4.20.0.dev202403271845"
 
 BROWSER_VERSIONS = [
     "v85",
diff --git a/py/docs/source/conf.py b/py/docs/source/conf.py
index aa001ffd1b07a..4b20185d79b83 100644
--- a/py/docs/source/conf.py
+++ b/py/docs/source/conf.py
@@ -56,9 +56,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '4.19'
+version = '4.20'
 # The full version, including alpha/beta/rc tags.
-release = '4.19.0'
+release = '4.20.0.dev202403271845'
 
 # 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 d561986493cd4..0b45db89b2ee4 100644
--- a/py/selenium/__init__.py
+++ b/py/selenium/__init__.py
@@ -16,4 +16,4 @@
 # under the License.
 
 
-__version__ = "4.19.0"
+__version__ = "4.20.0.dev202403271845"
diff --git a/py/selenium/webdriver/__init__.py b/py/selenium/webdriver/__init__.py
index bca431203c94d..43bdc023d404a 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__ = "4.19.0"
+__version__ = "4.20.0.dev202403271845"
 
 # 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 27fb5e9958c34..b44d0799af435 100755
--- a/py/setup.py
+++ b/py/setup.py
@@ -27,7 +27,7 @@
 setup_args = {
     'cmdclass': {'install': install},
     'name': 'selenium',
-    'version': "4.19.0",
+    'version': "4.20.0.dev202403271845",
     'license': 'Apache 2.0',
     'description': 'Python bindings for Selenium',
     'long_description': open(join(abspath(dirname(__file__)), "README.rst")).read(),
diff --git a/rb/lib/selenium/webdriver/version.rb b/rb/lib/selenium/webdriver/version.rb
index 87a613b438371..e170e4d2b7931 100644
--- a/rb/lib/selenium/webdriver/version.rb
+++ b/rb/lib/selenium/webdriver/version.rb
@@ -19,6 +19,6 @@
 
 module Selenium
   module WebDriver
-    VERSION = '4.19.0'
+    VERSION = '4.20.0.nightly'
   end # WebDriver
 end # Selenium
diff --git a/rust/BUILD.bazel b/rust/BUILD.bazel
index b02e206f90c9d..5010622427e47 100644
--- a/rust/BUILD.bazel
+++ b/rust/BUILD.bazel
@@ -77,7 +77,7 @@ rust_binary(
     name = "selenium-manager",
     srcs = ["src/main.rs"],
     edition = "2021",
-    version = "0.4.19",
+    version = "0.4.20-nightly",
     visibility = ["//visibility:public"],
     deps = [
         ":selenium_manager",
diff --git a/rust/Cargo.Bazel.lock b/rust/Cargo.Bazel.lock
index 03d1b78dea56c..23f1827dca13e 100644
--- a/rust/Cargo.Bazel.lock
+++ b/rust/Cargo.Bazel.lock
@@ -1,5 +1,5 @@
 {
-  "checksum": "c92c30dfcee338ee7a89723929f757bb27727238576facf2e007922d5f3b8643",
+  "checksum": "429663180e806b5eded3d78e76d2e9fcf145a9daa6790b6faa598196d2c64103",
   "crates": {
     "addr2line 0.19.0": {
       "name": "addr2line",
@@ -11135,9 +11135,9 @@
       ],
       "license_file": "LICENSE"
     },
-    "selenium-manager 0.4.19": {
+    "selenium-manager 0.4.20-nightly": {
       "name": "selenium-manager",
-      "version": "0.4.19",
+      "version": "0.4.20-nightly",
       "package_url": "https://github.com/SeleniumHQ/selenium",
       "repository": null,
       "targets": [
@@ -11270,7 +11270,7 @@
           "selects": {}
         },
         "edition": "2021",
-        "version": "0.4.19"
+        "version": "0.4.20-nightly"
       },
       "license": "Apache-2.0",
       "license_ids": [
@@ -17916,7 +17916,7 @@
   },
   "binary_crates": [],
   "workspace_members": {
-    "selenium-manager 0.4.19": "rust"
+    "selenium-manager 0.4.20-nightly": "rust"
   },
   "conditions": {
     "aarch64-apple-darwin": [
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index b0bcdd796bc94..55b710fa5bf6c 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -1680,7 +1680,7 @@ dependencies = [
 
 [[package]]
 name = "selenium-manager"
-version = "0.4.19"
+version = "0.4.20-nightly"
 dependencies = [
  "anyhow",
  "apple-flat-package",
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 1361adbc186b8..5d34733c29f69 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "selenium-manager"
-version = "0.4.19" # don't forget to update rust/BUILD.bazel
+version = "0.4.20-nightly" # don't forget to update rust/BUILD.bazel
 edition = "2021"
 authors = ["Selenium <selenium-developers@googlegroups.com"]
 license = "Apache-2.0"