diff --git a/modules/rules_ios/4.2.1/MODULE.bazel b/modules/rules_ios/4.2.1/MODULE.bazel
new file mode 100644
index 0000000000..49a9110686
--- /dev/null
+++ b/modules/rules_ios/4.2.1/MODULE.bazel
@@ -0,0 +1,107 @@
+"""
+Defines all the external repositories and dependencies for rules_ios.
+"""
+
+# Defines the rules_ios bzlmod module.
+# Version is updated during release to the registry.
+module(
+    name = "rules_ios",
+    version = "4.2.1",
+    bazel_compatibility = [
+        ">=6.0.0",
+        # Temporarily limit the usage of Bazel 7+ until
+        # https://github.com/bazel-ios/rules_ios/issues/795
+        # is complete.
+        "<7.0.0",
+    ],
+    compatibility_level = 1,
+    repo_name = "build_bazel_rules_ios",
+)
+
+# Declare the bzlmod dependencies needed by rules_ios and users of rules_ios
+bazel_dep(
+    name = "apple_support",
+    version = "1.11.1",
+    repo_name = "build_bazel_apple_support",
+)
+bazel_dep(
+    name = "rules_apple",
+    version = "3.1.1",
+    repo_name = "build_bazel_rules_apple",
+)
+bazel_dep(
+    name = "rules_cc",
+    version = "0.0.6",
+)
+bazel_dep(
+    name = "rules_swift",
+    version = "1.13.0",
+    repo_name = "build_bazel_rules_swift",
+)
+bazel_dep(
+    name = "bazel_skylib",
+    version = "1.4.2",
+)
+
+# Declare the development dependencies needed for rules_ios development
+bazel_dep(
+    name = "buildifier_prebuilt",
+    version = "6.1.0",
+    dev_dependency = True,
+)
+bazel_dep(
+    name = "rules_pkg",
+    version = "0.9.1",
+    dev_dependency = True,
+)
+bazel_dep(
+    name = "stardoc",
+    version = "0.6.2",
+    dev_dependency = True,
+    repo_name = "io_bazel_stardoc",
+)
+
+# Load non-bzlmod dependencies from rules_ios
+non_module_deps = use_extension("//rules:module_extensions.bzl", "non_module_deps")
+use_repo(
+    non_module_deps,
+    "arm64-to-sim",
+    "com_github_yonaskolb_xcodegen",
+    "tart",
+)
+
+non_module_dev_deps = use_extension(
+    "//rules:module_extensions.bzl",
+    "non_module_dev_deps",
+    dev_dependency = True,
+)
+use_repo(
+    non_module_dev_deps,
+    "com_github_apple_swiftcollections",
+)
+
+# Configure Xcode
+xcode_configure = use_extension(
+    "//rules:module_extensions.bzl",
+    "xcode_configure",
+    dev_dependency = True,
+)
+xcode_configure.configure(
+    remote_xcode_label = "",
+    xcode_locator_label = "//tools/toolchains/xcode_configure:xcode_locator.m",
+)
+
+# Load non-bzlmod dependencies used in this repo from rules_swift
+swift_non_module_deps = use_extension("@build_bazel_rules_swift//swift:extensions.bzl", "non_module_deps")
+use_repo(
+    swift_non_module_deps,
+    "build_bazel_rules_swift_index_import",
+    "build_bazel_rules_swift_local_config",
+)
+
+# Load non-bzlmod dependencies used in this repo from rules_apple
+apple_non_module_deps = use_extension("@build_bazel_rules_apple//apple:extensions.bzl", "non_module_deps")
+use_repo(
+    apple_non_module_deps,
+    "xctestrunner",
+)
diff --git a/modules/rules_ios/4.2.1/patches/module_dot_bazel_version.patch b/modules/rules_ios/4.2.1/patches/module_dot_bazel_version.patch
new file mode 100644
index 0000000000..da96cf51cd
--- /dev/null
+++ b/modules/rules_ios/4.2.1/patches/module_dot_bazel_version.patch
@@ -0,0 +1,14 @@
+===================================================================
+--- a/MODULE.bazel
++++ b/MODULE.bazel
+@@ -5,9 +5,9 @@
+ # Defines the rules_ios bzlmod module.
+ # Version is updated during release to the registry.
+ module(
+     name = "rules_ios",
+-    version = "0",
++    version = "4.2.1",
+     bazel_compatibility = [
+         ">=6.0.0",
+         # Temporarily limit the usage of Bazel 7+ until
+         # https://github.com/bazel-ios/rules_ios/issues/795
diff --git a/modules/rules_ios/4.2.1/presubmit.yml b/modules/rules_ios/4.2.1/presubmit.yml
new file mode 100644
index 0000000000..3a425c6ef7
--- /dev/null
+++ b/modules/rules_ios/4.2.1/presubmit.yml
@@ -0,0 +1,9 @@
+matrix:
+  bazel: ["6.x"]
+tasks:
+  verify_build_targets:
+    name: Verify Build targets on macOS
+    platform: macos_arm64
+    bazel: ${{ bazel }}
+    build_targets:
+      - "@rules_ios//rules/..."
diff --git a/modules/rules_ios/4.2.1/source.json b/modules/rules_ios/4.2.1/source.json
new file mode 100644
index 0000000000..a7d4361c68
--- /dev/null
+++ b/modules/rules_ios/4.2.1/source.json
@@ -0,0 +1,9 @@
+{
+    "integrity": "sha256-i3rYJIRLboUx7PU3hqAXHwrJN+ZZtTca7v0kzaLTgt4=",
+    "strip_prefix": "",
+    "url": "https://github.com/bazel-ios/rules_ios/releases/download/4.2.1/rules_ios.4.2.1.tar.gz",
+    "patches": {
+        "module_dot_bazel_version.patch": "sha256-klNV1GRn0P3PUTpfjQ4KWwF1zBJR0r37uUIgPxlx9rg="
+    },
+    "patch_strip": 1
+}
diff --git a/modules/rules_ios/metadata.json b/modules/rules_ios/metadata.json
index 2dabf10c15..c870289c41 100644
--- a/modules/rules_ios/metadata.json
+++ b/modules/rules_ios/metadata.json
@@ -25,7 +25,8 @@
         "3.2.2",
         "4.0.0",
         "4.1.0",
-        "4.2.0"
+        "4.2.0",
+        "4.2.1"
     ],
     "yanked_versions": {}
 }