diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f2f89f..9b9bb7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+# 0.5.1 (March 27, 2026)
+
+- Add `InjectorPP::new_global()` constructor for cross-thread fake visibility.
+  - Fakes registered through `new_global()` use direct code patching (0.4.0-style) and are visible to **all threads**, including background threads, timers, and thread pools like rayon.
+  - `new()` remains the default with thread-local dispatch for parallel test execution.
+  - `new_global()` acquires an exclusive lock, serializing tests that use it.
+- Fix fakes not visible from rayon worker threads and background timer threads (issue #121).
+- Add IAT thunk resolution to PatchGuard path on Windows x86_64.
+
 # 0.5.0 (March 15, 2026)
 
 - Add macOS support.
diff --git a/Cargo.toml b/Cargo.toml
index f5c69bb..161fb4c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "injectorpp"
-version = "0.5.0"
+version = "0.5.1"
 authors = ["Jingyu Ma <mazong1123us@gmail.com>"]
 license = "MIT"
 readme = "README.md"
diff --git a/README.md b/README.md
index c892413..5618acc 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ Add `injectorpp` to the `Cargo.toml`:
 
 ```toml
 [dev-dependencies]
-injectorpp = "0.5.0"
+injectorpp = "0.5.1"
 ```
 
 Below `profile.test` config is recommended to make sure `injectorpp` working correctly in tests. If you have workspace, make sure add this on the top level of `Cargo.toml`:
@@ -88,6 +88,27 @@ use injectorpp::interface::injector::*;
 
 Below are multiple ways to config the function behavior.
 
+## Thread-local vs Global mode
+
+By default, `InjectorPP::new()` uses **thread-local dispatch** — fakes are only visible on the thread that created the injector. This enables parallel test execution without interference between tests.
+
+However, if your code under test spawns background threads, timers, or uses thread pools, those worker threads won't see thread-local fakes. For these cases, use `InjectorPP::new_global()`:
+
+```rust
+// Thread-local mode (default) — fakes only visible on the current thread
+let mut injector = InjectorPP::new();
+
+// Global mode — fakes visible to ALL threads (background threads, timers, thread pools)
+let mut injector = InjectorPP::new_global();
+```
+
+`new_global()` uses direct code patching, making fakes visible process-wide. It acquires an exclusive lock, so tests using `new_global()` run serialized to prevent interference.
+
+**When to use `new_global()`:**
+- Your faked function is called from a background thread or timer
+- You use thread pool APIs that execute work on worker threads
+- You need the same behavior as injectorpp 0.4.0
+
 ## `will_return_boolean`
 
 If the function only returns boolean and you only want to make it constantly returns a specific boolean value, you can use `will_return_boolean`:
diff --git a/injectorpp-macros/Cargo.toml b/injectorpp-macros/Cargo.toml
index 0caaa33..5ec6ac2 100644
--- a/injectorpp-macros/Cargo.toml
+++ b/injectorpp-macros/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "injectorpp-macros"
-version = "0.5.0"
+version = "0.5.1"
 authors = ["Jingyu Ma <mazong1123us@gmail.com>"]
 license = "MIT"
 repository = "https://github.com/microsoft/injectorppforrust"
diff --git a/tests/global.rs b/tests/global.rs
index 0d1adba..efe9911 100644
--- a/tests/global.rs
+++ b/tests/global.rs
@@ -186,7 +186,7 @@ fn test_global_fake_unchecked_cross_thread() {
 }
 
 /// Verifies that `new()` (thread-local mode) still works correctly — fakes are NOT visible
-/// from spawned threads (default 0.5.0 behavior).
+/// from spawned threads (default thread-local behavior).
 #[test]
 #[cfg(any(target_arch = "x86_64", target_arch = "aarch64", target_arch = "arm"))]
 fn test_thread_local_mode_not_visible_from_spawned_thread() {