diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index db0b7ca3f..d57a14d0e 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -9,7 +9,7 @@ permissions:
   contents: write
 
 env:
-  RELEASE: Release v3.4.1
+  RELEASE: Release v3.4.3
   FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
   
 name: Release
@@ -19,7 +19,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        branch: [v1.9.11,v2.4.1,v3.4.1]  # [dev,dev2,dev3]
+        branch: [v3.4.3]  # [dev,dev2,dev3]
         # we build on the oldest ubuntu version for better binary compatibility.
         os: [windows-latest, macOS-latest, macos-15-intel, ubuntu-22.04, ubuntu-22.04-arm]  
 
diff --git a/readme.md b/readme.md
index 5f75e7c35..af157d3b0 100644
--- a/readme.md
+++ b/readme.md
@@ -15,7 +15,7 @@ is a general purpose allocator with excellent [performance](#performance) charac
 Initially developed by Daan Leijen for the runtime systems of the
 [Koka](https://koka-lang.github.io) and [Lean](https://github.com/leanprover/lean) languages.
 
-Latest release   : `v3.4.1`  (2026-07-14) recommended.  
+Latest release   : `v3.4.3`  (2026-07-20) recommended.  
 Latest v2 release: `v2.4.1`  (2026-07-14) stable.  
 Latest v1 release: `v1.9.11` (2026-07-14) legacy.
 
@@ -88,6 +88,7 @@ New development is mostly on v3, while v1 and v2 are maintained with security an
 - __v1__: legacy version: initial design of mimalloc (release tags: `v1.9.x`, development branch `dev`). Send PR's against this version if possible.
 
 ### Releases
+* 2026-07-20, `v3.4.3`: revert TLS slots on macOS to 108/109 (issue #1333).
 * 2026-07-14, `v1.9.11`, `v2.4.1`, `v3.4.1`: various bug and security fixes through LLM audit (by @Zoxc). 
   Fix issue with using OS memory instead of arenas for > 4GiB memory usage (v3), fix concurrency bug in concurrent
   heap destroy (v3), detect riscV virtual address bits at runtime, add riscV TLS support, reduce spinlock waits (v2),
diff --git a/src/prim/osx/alloc-override-zone.c b/src/prim/osx/alloc-override-zone.c
index 0aa6cc7d2..fe8da341c 100644
--- a/src/prim/osx/alloc-override-zone.c
+++ b/src/prim/osx/alloc-override-zone.c
@@ -226,6 +226,8 @@ static malloc_introspection_t mi_introspect = {
 #if defined(MAC_OS_X_VERSION_10_6) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6) && !defined(__ppc__)
   .statistics = &intro_statistics,
   .zone_locked = &intro_zone_locked,
+#endif  
+#if defined(MAC_OS_X_VERSION_10_12) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_12) && !defined(__ppc__)
   .reinit_lock = &intro_reinit_lock,
 #endif
 };