diff --git a/codex-launcher_3.12.1_all.deb b/codex-launcher_3.12.1_all.deb
index 6a1ade4..a46a774 100644
Binary files a/codex-launcher_3.12.1_all.deb and b/codex-launcher_3.12.1_all.deb differ
diff --git a/src/codex-launcher-gui b/src/codex-launcher-gui
index 000e696..dd70185 100755
--- a/src/codex-launcher-gui
+++ b/src/codex-launcher-gui
@@ -27,6 +27,11 @@ model_catalog_json = ""
 """
 
 CHANGELOG = [
+    ("3.12.1", "2026-05-27", [
+        "Fix Antigravity adapter (PR #15): simplified model resolution",
+        "Removed broken schema sanitization, restored headers",
+        "Re-enabled gRPC fallback by default",
+    ]),
     ("3.12.0", "2026-05-27", [
         "gRPC auto-fallback for Antigravity (PR #13)",
         "Dynamic version fetch with probe validation",
diff --git a/src/codex_launcher_lib.py b/src/codex_launcher_lib.py
index 9f93125..a6a5b92 100644
--- a/src/codex_launcher_lib.py
+++ b/src/codex_launcher_lib.py
@@ -83,6 +83,12 @@ model_catalog_json = ""
 """
 
 CHANGELOG = [
+    ("3.12.1", "2026-05-27", [
+        "Fix Antigravity adapter (PR #15): simplify model resolution",
+        "Removed broken schema sanitization, restored correct headers",
+        "Expanded model alias map for all Antigravity variants",
+        "Re-enabled gRPC fallback by default",
+    ]),
     ("3.12.0", "2026-05-27", [
         "gRPC auto-fallback for Antigravity provider (PR #13)",
         "New antigravity_grpc module with protobuf client",