diff --git a/docs/api.md b/docs/api.md
index d4244a0..fc947ea 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -55,7 +55,7 @@ Returns server version for compatibility checking.
 
 **Example response:**
 ```json
-{"version": "2.1.0"}
+{"version": "2.1.1"}
 ```
 
 ### `GET /api/status`
diff --git a/frontend/index.html b/frontend/index.html
index aaf925d..066d279 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -18,7 +18,7 @@
 <div class="max-w-7xl mx-auto px-6 py-2">
 
 	<div class="flex items-center justify-between mb-3">
-		<h1 class="text-2xl font-bold text-heading">OTAMan <span id="slogan" class="text-sm font-normal text-gray-500 dark:text-slate-400 ml-2" data-l10n="SIM OTA with a Human Face">SIM OTA with a Human Face</span> <span class="text-xs text-gray-400 dark:text-slate-500 ml-1">v2.1.0</span></h1>
+		<h1 class="text-2xl font-bold text-heading">OTAMan <span id="slogan" class="text-sm font-normal text-gray-500 dark:text-slate-400 ml-2" data-l10n="SIM OTA with a Human Face">SIM OTA with a Human Face</span> <span class="text-xs text-gray-400 dark:text-slate-500 ml-1">v2.1.1</span></h1>
 		<div class="flex items-center gap-4">
 			<span id="state-indicator" class="flex items-center select-none" style="cursor:default" title="Connecting...">
 				<span id="state-indicator-dot" class="text-xs text-gray-400" title="Connecting...">●</span>
diff --git a/frontend/sw.js b/frontend/sw.js
index be4cafd..b2534dd 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'otaman-v124';
+const CACHE = 'otaman-v125';
 const URLS = [
   'index.html',
   'help.html',
diff --git a/pyproject.toml b/pyproject.toml
index e1d8973..753e268 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-otaman-server"
-version = "2.1.0"
+version = "2.1.1"
 description = "HTTP REST server wrapping pysim for the OTAMan PWA"
 requires-python = ">=3.8"
 # pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.
diff --git a/pysim_otaman_server/server.py b/pysim_otaman_server/server.py
index 768c878..3aa8d71 100644
--- a/pysim_otaman_server/server.py
+++ b/pysim_otaman_server/server.py
@@ -19,7 +19,7 @@ from osmocom.construct import GsmOrUcs2Adapter
 from osmocom.tlv import BER_TLV_IE
 
 
-VERSION = '2.1.0'
+VERSION = '2.1.1'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE