diff --git a/keywords.txt b/keywords.txt
index d483099..a3206b9 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -92,5 +92,6 @@ ALEX2ESP_MAX_MESSAGE	LITERAL1
 ALEX2ESP_MAX_QUEUED_DIRECTIVES	LITERAL1
 ALEX2ESP_MAX_QUEUED_BYTES	LITERAL1
 ALEX2ESP_LOG_MAX	LITERAL1
+ALEX2ESP_VERSION	LITERAL1
 ALEXA_TIMESTAMP_SIZE	LITERAL1
 MAX_EVENTS	LITERAL1
diff --git a/library.json b/library.json
index 89d9379..aecf65d 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
     "name": "Alex2ESP",
-    "version": "1.1.0",
+    "version": "1.2.0",
     "description": "Companion library for the Alex2MQTT Alexa skill: exposes ESP8266 devices to Alexa through alex2mqtt.stormysdream.club over MQTT (discovery, directives, state reports).",
     "keywords": [
         "alexa",
diff --git a/library.properties b/library.properties
index cb702c7..3fafd52 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Alex2ESP
-version=1.1.0
+version=1.2.0
 author=David <Alex2ESP@stormysdream.club>
 maintainer=David <Alex2ESP@stormysdream.club>
 sentence=A companion library for the Alex2MQTT Alexa Skill (ESP8266).
diff --git a/readme.md b/readme.md
index 548f407..3343f44 100644
--- a/readme.md
+++ b/readme.md
@@ -260,6 +260,8 @@ Memory: `examples/basicLight.cpp` for a D1 mini takes 34,452 bytes of static RAM
 
 Tests: `pio test -e native` in the repository runs 41 host tests of the receive and publish logic (reassembly of fragments, the directives that wait for `loop()`, repeated directives, the size limits, a heap without room, topics, time stamps). No board is needed.
 
+Packaging: `library.json`, `library.properties` and the `softwareVersion` and `firmwareVersion` that a device reports in discovery say 1.2.0; the library has the number in one place, `ALEX2ESP_VERSION` in `src/AlexaVersion.h`. The `platformio.ini` of the repository is for the host tests; a sketch does not need it.
+
 Boards that run 1.1.0 are not affected: the backend keeps the token topic and the HTTP routes.
 
 ### 1.1.0
diff --git a/src/AlexaDevice.cpp b/src/AlexaDevice.cpp
index 95d6ca7..3d7ddbc 100644
--- a/src/AlexaDevice.cpp
+++ b/src/AlexaDevice.cpp
@@ -110,7 +110,7 @@ JsonDocument AlexaDevice::getDeviceJSON() const {
     additionalAttributes["manufacturer"] = manufacturer;
     additionalAttributes["model"] = model;
     additionalAttributes["serialNumber"] = "ESP2Alex";
-    additionalAttributes["firmwareVersion"] = "1.1.0";
+    additionalAttributes["firmwareVersion"] = ALEX2ESP_VERSION;
     additionalAttributes["softwareVersion"] = softwareVersion;
     additionalAttributes["customIdentifier"] = "ESP2Alex";
 
diff --git a/src/AlexaDevice.h b/src/AlexaDevice.h
index 4f87793..357363c 100644
--- a/src/AlexaDevice.h
+++ b/src/AlexaDevice.h
@@ -11,6 +11,7 @@
 #include <deque>
 #include "AlexaStatusMessage.h"
 #include "AlexaTransport.h"
+#include "AlexaVersion.h"
 
 
 #define MAX_EVENTS 10
@@ -205,7 +206,7 @@ private:
     String manufacturerName = "Alexa2MQTT";
     String manufacturer = "Alexa2MQTT";
     String model = "Alexa2MQTT";
-    const String softwareVersion = "1.1.0";
+    const String softwareVersion = ALEX2ESP_VERSION;
 
     std::deque<AlexaInterface> capabilities; // deque: pointers handed out by addCapability stay valid
 
diff --git a/src/AlexaVersion.h b/src/AlexaVersion.h
new file mode 100644
index 0000000..0788600
--- /dev/null
+++ b/src/AlexaVersion.h
@@ -0,0 +1,8 @@
+// The version of the library, the same as in library.json and library.properties. The devices report it to Alexa
+// as softwareVersion and firmwareVersion.
+#ifndef ALEXA_VERSION_H
+#define ALEXA_VERSION_H
+
+#define ALEX2ESP_VERSION "1.2.0"
+
+#endif // ALEXA_VERSION_H