diff --git a/doc/changelogs/RELEASE_NOTES_v0.9.9.md b/doc/changelogs/RELEASE_NOTES_v0.9.9.md
new file mode 100644
index 0000000000..7686f0cd52
--- /dev/null
+++ b/doc/changelogs/RELEASE_NOTES_v0.9.9.md
@@ -0,0 +1,45 @@
+# Snapmaker Orca FullSpectrum v0.9.9
+
+Local-Z toolchange reduction, prime tower planning, and physical-color geometry fixes.
+
+## Quick Overview
+
+- Greatly reduces Local-Z toolchanges by batching same-plane work across objects and scheduling Local-Z passes with dependency chains.
+- Reworks Local-Z prime tower behavior so Local-Z swaps are planned ahead of time instead of using oversized reserve slots.
+- Fixes Local-Z prime tower correctness issues, including missing plan lookups, final-purge sentinel handling, and empty nominal-toolchange layers.
+- Fixes classic Local-Z physical-color regions so ordinary physical filament zones stay at nominal layer height instead of inheriting mixed-row micro-heights.
+- Keeps whole-object Local-Z behavior available, while giving physical-color zones a clean two-pass split instead of arbitrary mixed-row pass heights.
+
+## More Detailed Overview
+
+### Local-Z Toolchange Scheduling
+
+- Groups Local-Z phase-b perimeter work by shared micro-pass `print_z` across objects, instead of restarting optimization for each object layer.
+- Adds dependency-chain metadata to Local-Z sublayer plans so independent swatches or mixed regions can be scheduled in a tool-friendly order without violating vertical pass dependencies.
+- Extends dependency-chain tagging to single-row split intervals, which lets common calibration swatches use the optimized Local-Z scheduler instead of falling back to raw pass order.
+- Uses the dependency scheduler in both G-code emission and Local-Z wipe-tower preplanning so the tower and object path agree on the same toolchange sequence.
+- Carries the actual ending Local-Z tool into the nominal layer loop instead of forcing a restore to the pre-pass tool, removing a recurring unnecessary toolchange pattern.
+- Improves Local-Z island assignment with more robust interior sampling so boundary-starting paths are less likely to be assigned to the wrong island bucket.
+
+### Local-Z Prime Tower
+
+- Preplans Local-Z wipe-tower swaps as real toolchange events instead of treating them as late, unplanned reserve-slot users.
+- Replaces the old padded Local-Z reserve-band behavior with exact planned Local-Z tower toolchanges, making the tower denser and less wasteful.
+- Keeps the old reserve-slot path as a fallback if runtime ever diverges from the preplanned sequence.
+- Fixes Local-Z tower layers that contain only Local-Z toolchanges and no nominal tower toolchanges.
+- Fixes final-purge sentinel handling so the tower does not mistake the final unload for a normal planned toolchange.
+- Makes nominal wipe-tower generation consume exact planned toolchange entries directly, reducing fragile lookup behavior when the current tool state drifts.
+
+### Local-Z Geometry Correctness
+
+- Fixes classic Local-Z mode so pure physical-filament regions remain in the normal nominal layer instead of being pulled into mixed Local-Z micro-passes.
+- Fixes overlapping thick/thin layer bands in physical-color zones caused by fixed physical masks inheriting mixed-row variable pass heights.
+- Keeps Local-Z micro-height splitting focused on actual mixed-filament painted regions in classic mode.
+- Updates whole-object Local-Z handling so physical-color regions can still participate when requested, but use a clean two-pass half-layer split rather than arbitrary mixed-row heights.
+- Preserves fixed-color guard behavior around whole-object Local-Z mixed masks so painted mixed regions do not grow into neighboring physical-color caps.
+
+## Notes
+
+- macOS builds from this fork remain unsigned and not notarized.
+- Release downloads for this fork are available here: https://github.com/ratdoux/OrcaSlicer-FullSpectrum/releases
+- Use at your own risk.
diff --git a/src/common_func/common_func.hpp b/src/common_func/common_func.hpp
index 2fca41c26b..678458b829 100644
--- a/src/common_func/common_func.hpp
+++ b/src/common_func/common_func.hpp
@@ -7,7 +7,7 @@
 #define SLIC3R_APP_KEY "Snapmaker_Orca"
 #define SLIC3R_VERSION "01.10.01.70"
 #define Snapmaker_VERSION "2.3.1"
-#define FULLSPECTRUM_VERSION "0.9.8"
+#define FULLSPECTRUM_VERSION "0.9.9"
 #define MIN_FIRM_VER "1.0.0"
 #ifndef GIT_COMMIT_HASH
 #define GIT_COMMIT_HASH "0000000" // 0000000 means uninitialized
diff --git a/version.inc b/version.inc
index f4453ba6e4..88604a393a 100644
--- a/version.inc
+++ b/version.inc
@@ -10,8 +10,8 @@ endif()
 if(NOT DEFINED BBL_INTERNAL_TESTING)
 set(BBL_INTERNAL_TESTING "0")
 endif()
-set(Snapmaker_VERSION "0.9.8")
-set(FULLSPECTRUM_VERSION "0.9.8")
+set(Snapmaker_VERSION "0.9.9")
+set(FULLSPECTRUM_VERSION "0.9.9")
 set(MIN_FIRM_VER "1.0.0")
 string(REGEX MATCH "^([0-9]+)\\.([0-9]+)\\.([0-9]+)"
        Snapmaker_VERSION_MATCH ${Snapmaker_VERSION})