diff --git a/CHANGELOG.md b/CHANGELOG.md
index d5cef71..e602dc3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## v2.1.1 (2026-05-19)
+
+- Fixed proxy: map `developer` role to `system` for Chat Completions providers (DeepSeek, Qwen, etc.)
+- Fixed proxy: map `developer` role to `user` for Anthropic providers
+- Forward `instructions` field from Responses API as system message/param
+- Fixes "unknown variant `developer`" error from providers like DeepSeek
+
 ## v2.1.0 (2026-05-19)
 
 - Added Codex auth status detection (reads `codex login status`)
diff --git a/codex-launcher_2.1.0_all.deb b/codex-launcher_2.1.0_all.deb
deleted file mode 100644
index 7bee63b..0000000
Binary files a/codex-launcher_2.1.0_all.deb and /dev/null differ
diff --git a/codex-launcher_2.1.1_all.deb b/codex-launcher_2.1.1_all.deb
new file mode 100644
index 0000000..56b06c5
Binary files /dev/null and b/codex-launcher_2.1.1_all.deb differ
diff --git a/src/codex-launcher-gui b/src/codex-launcher-gui
index 9170285..ef10be8 100755
--- a/src/codex-launcher-gui
+++ b/src/codex-launcher-gui
@@ -24,6 +24,12 @@ model_catalog_json = ""
 """
 
 CHANGELOG = [
+    ("2.1.1", "2026-05-19", [
+        "Fixed proxy: map 'developer' role to 'system' for Chat Completions providers",
+        "Fixed proxy: map 'developer' role to 'user' for Anthropic providers",
+        "Forward 'instructions' field from Responses API as system message/param",
+        "Fixes DeepSeek and other providers rejecting unknown 'developer' role",
+    ]),
     ("2.1.0", "2026-05-19", [
         "Added Codex auth status detection (codex login status)",
         "Added Re-login button to re-authenticate via codex login",
@@ -494,7 +500,7 @@ class LauncherWin(Gtk.Window):
         # header row
         hdr = Gtk.Box(spacing=8)
         vbox.pack_start(hdr, False, False, 0)
-        lbl = Gtk.Label(label="<b>Codex Launcher v2.1.0</b>")
+        lbl = Gtk.Label(label="<b>Codex Launcher v2.1.1</b>")
         lbl.set_use_markup(True)
         hdr.pack_start(lbl, False, False, 0)
         changelog_btn = Gtk.Button(label="Changelog")
diff --git a/src/translate-proxy.py b/src/translate-proxy.py
index 5f1d632..adb1e05 100755
--- a/src/translate-proxy.py
+++ b/src/translate-proxy.py
@@ -151,6 +151,8 @@ def oa_input_to_messages(input_data):
             t = item.get("type")
             if t == "message":
                 role = item.get("role", "user")
+                if role == "developer":
+                    role = "system"
                 text = ""
                 for part in item.get("content", []):
                     pt = part.get("type", "")
@@ -323,6 +325,8 @@ def an_input_to_messages(input_data):
             t = item.get("type")
             if t == "message":
                 role = item.get("role", "user")
+                if role == "developer":
+                    role = "user"
                 text = ""
                 for part in item.get("content", []):
                     pt = part.get("type", "")
@@ -532,7 +536,11 @@ class Handler(http.server.BaseHTTPRequestHandler):
 
     def _handle_openai_compat(self, body, model, stream):
         input_data = body.get("input", "")
-        chat_body = {"model": model, "messages": oa_input_to_messages(input_data)}
+        messages = oa_input_to_messages(input_data)
+        instructions = body.get("instructions", "").strip()
+        if instructions:
+            messages.insert(0, {"role": "system", "content": instructions})
+        chat_body = {"model": model, "messages": messages}
         for k in ("temperature", "top_p", "max_output_tokens"):
             if k in body:
                 chat_body["max_tokens" if k == "max_output_tokens" else k] = body[k]
@@ -562,6 +570,9 @@ class Handler(http.server.BaseHTTPRequestHandler):
         input_data = body.get("input", "")
         an_body = {"model": model, "messages": an_input_to_messages(input_data),
                    "max_tokens": body.get("max_output_tokens", 8192)}
+        instructions = body.get("instructions", "").strip()
+        if instructions:
+            an_body["system"] = instructions
         for k in ("temperature", "top_p"):
             if k in body:
                 an_body[k] = body[k]