diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0782a2e..8328ed2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to iNTERCEPT will be documented in this file.
 
+## [2.26.3] - 2026-03-13
+
+### Fixed
+- **SatDump AVX2 crash** — SatDump now compiles with `-march=x86-64` on x86_64 platforms (Docker and `setup.sh`), preventing "Illegal instruction" crashes on CPUs without AVX2. SIMD plugins still use runtime detection for acceleration on capable hardware. (#185)
+
+---
+
 ## [2.26.2] - 2026-03-13
 
 ### Fixed
diff --git a/config.py b/config.py
index 27023de..3de94c3 100644
--- a/config.py
+++ b/config.py
@@ -7,10 +7,17 @@ import os
 import sys
 
 # Application version
-VERSION = "2.26.2"
+VERSION = "2.26.3"
 
 # Changelog - latest release notes (shown on welcome screen)
 CHANGELOG = [
+    {
+        "version": "2.26.3",
+        "date": "March 2026",
+        "highlights": [
+            "Fix SatDump AVX2 crash on older CPUs — build now targets baseline x86-64",
+        ]
+    },
     {
         "version": "2.26.2",
         "date": "March 2026",
diff --git a/pyproject.toml b/pyproject.toml
index 7155c29..9e23c61 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "intercept"
-version = "2.26.2"
+version = "2.26.3"
 description = "Signal Intelligence Platform - Pager/433MHz/ADS-B/Satellite/WiFi/Bluetooth"
 readme = "README.md"
 requires-python = ">=3.9"