diff --git a/README.md b/README.md
index f42bb8d17..941c057de 100644
--- a/README.md
+++ b/README.md
@@ -7,8 +7,8 @@
 
 This library enables you to **send _and_ receive** infra-red signals on an [ESP8266 using the Arduino framework](https://github.com/esp8266/Arduino) using common 940nm IR LEDs and common IR receiver modules. e.g. TSOP{17,22,24,36,38,44,48}* etc.
 
-## v2.4.0 Now Available
-Version 2.4.0 of the library is now [available](https://github.com/markszabo/IRremoteESP8266/releases/latest). You can view the [Release Notes](ReleaseNotes.md) for all the significant changes.
+## v2.4.1 Now Available
+Version 2.4.1 of the library is now [available](https://github.com/markszabo/IRremoteESP8266/releases/latest). You can view the [Release Notes](ReleaseNotes.md) for all the significant changes.
 
 #### Upgrading from pre-v2.0
 Usage of the library slight changed at v2.0. You will need to change your usage to work with v2.0 and beyond. You can read more about the changes required on our [Upgrade to v2.0](https://github.com/markszabo/IRremoteESP8266/wiki/Upgrading-to-v2.0) page.
diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index b0e1c891f..04c0984fb 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -1,5 +1,20 @@
 # Release Notes
 
+## _v2.4.1 (20180520)_
+
+**[Bug Fixes]**
+- Fix crash in IRMQTTServer when compiled under Arduino IDE. (#455)
+- Default bit length not set for RCMM in IRMQTTServer example. (#456)
+- Bad acknowledgements for some A/C protocols in IRMQTTServer example. (#460)
+
+**[Features]**
+- Allow disabling the use of delay() calls. (#450)
+- Initial support for G.I. Cable protocol. (#458)
+- Support of Hitachi A/C 13 & 53 byte messages. (#461)
+
+**[Misc]**
+- Auto Analyse Raw Data script converted to Python. (#454)
+
 ## _v2.4.0 (20180407)_
 
 **[Bug Fixes]**
diff --git a/keywords.txt b/keywords.txt
index 8e582aed7..2c8ecf96a 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -65,6 +65,7 @@ decodeDISH	KEYWORD2
 decodeDaikin	KEYWORD2
 decodeDenon	KEYWORD2
 decodeFujitsuAC	KEYWORD2
+decodeGICable	KEYWORD2
 decodeGree	KEYWORD2
 decodeHaierAC	KEYWORD2
 decodeHash	KEYWORD2
@@ -188,10 +189,13 @@ sendData	KEYWORD2
 sendDenon	KEYWORD2
 sendFujitsuAC	KEYWORD2
 sendGC	KEYWORD2
+sendGICable	KEYWORD2
 sendGeneric	KEYWORD2
 sendGree	KEYWORD2
 sendHaierAC	KEYWORD2
 sendHitachiAC	KEYWORD2
+sendHitachiAC1	KEYWORD2
+sendHitachiAC2	KEYWORD2
 sendJVC	KEYWORD2
 sendKelvinator	KEYWORD2
 sendLG	KEYWORD2
@@ -287,6 +291,7 @@ AIWA_RC_T501_POST_BITS	LITERAL1
 AIWA_RC_T501_POST_DATA	LITERAL1
 AIWA_RC_T501_PRE_BITS	LITERAL1
 AIWA_RC_T501_PRE_DATA	LITERAL1
+ALLOW_DELAY_CALLS	LITERAL1
 ARDB1	LITERAL1
 ARGO	LITERAL1
 ARGO_BIT_MARK	LITERAL1
@@ -394,11 +399,14 @@ DECODE_DAIKIN	LITERAL1
 DECODE_DENON	LITERAL1
 DECODE_DISH	LITERAL1
 DECODE_FUJITSU_AC	LITERAL1
+DECODE_GICABLE	LITERAL1
 DECODE_GLOBALCACHE	LITERAL1
 DECODE_GREE	LITERAL1
 DECODE_HAIER_AC	LITERAL1
 DECODE_HASH	LITERAL1
 DECODE_HITACHI_AC	LITERAL1
+DECODE_HITACHI_AC1	LITERAL1
+DECODE_HITACHI_AC2	LITERAL1
 DECODE_JVC	LITERAL1
 DECODE_KELVINATOR	LITERAL1
 DECODE_LASERTAG	LITERAL1
@@ -496,9 +504,19 @@ FUJITSU_AC_SWING_HORIZ	LITERAL1
 FUJITSU_AC_SWING_OFF	LITERAL1
 FUJITSU_AC_SWING_VERT	LITERAL1
 FUJITSU_AC_ZERO_SPACE	LITERAL1
+GICABLE	LITERAL1
+GICABLE_BITS	LITERAL1
+GICABLE_BIT_MARK	LITERAL1
+GICABLE_HDR_MARK	LITERAL1
+GICABLE_HDR_SPACE	LITERAL1
+GICABLE_MIN_COMMAND_LENGTH	LITERAL1
+GICABLE_MIN_GAP	LITERAL1
+GICABLE_MIN_REPEAT	LITERAL1
+GICABLE_ONE_SPACE	LITERAL1
+GICABLE_RPT_SPACE	LITERAL1
+GICABLE_ZERO_SPACE	LITERAL1
 GLOBALCACHE	LITERAL1
 GLOBALCACHE_FREQ_INDEX	LITERAL1
-GLOBALCACHE_MAX_REPEAT	LITERAL1
 GLOBALCACHE_MIN_USEC	LITERAL1
 GLOBALCACHE_RPT_INDEX	LITERAL1
 GLOBALCACHE_RPT_START_INDEX	LITERAL1
@@ -583,6 +601,14 @@ HAIER_AC_ZERO_SPACE	LITERAL1
 HEADER	LITERAL1
 HIGH	LITERAL1
 HITACHI_AC	LITERAL1
+HITACHI_AC1	LITERAL1
+HITACHI_AC1_BITS	LITERAL1
+HITACHI_AC1_HDR_MARK	LITERAL1
+HITACHI_AC1_HDR_SPACE	LITERAL1
+HITACHI_AC1_STATE_LENGTH	LITERAL1
+HITACHI_AC2	LITERAL1
+HITACHI_AC2_BITS	LITERAL1
+HITACHI_AC2_STATE_LENGTH	LITERAL1
 HITACHI_AC_BITS	LITERAL1
 HITACHI_AC_BIT_MARK	LITERAL1
 HITACHI_AC_HDR_MARK	LITERAL1
@@ -705,6 +731,7 @@ MAGIQUEST_SPACE_ZERO	LITERAL1
 MAGIQUEST_TOTAL_USEC	LITERAL1
 MAGIQUEST_ZERO_RATIO	LITERAL1
 MARK_EXCESS	LITERAL1
+MAX_ACCURATE_USEC_DELAY	LITERAL1
 MAX_TIMEOUT_MS	LITERAL1
 MIDEA	LITERAL1
 MIDEA_AC_AUTO	LITERAL1
@@ -940,10 +967,13 @@ SEND_DAIKIN	LITERAL1
 SEND_DENON	LITERAL1
 SEND_DISH	LITERAL1
 SEND_FUJITSU_AC	LITERAL1
+SEND_GICABLE	LITERAL1
 SEND_GLOBALCACHE	LITERAL1
 SEND_GREE	LITERAL1
 SEND_HAIER_AC	LITERAL1
 SEND_HITACHI_AC	LITERAL1
+SEND_HITACHI_AC1	LITERAL1
+SEND_HITACHI_AC2	LITERAL1
 SEND_JVC	LITERAL1
 SEND_KELVINATOR	LITERAL1
 SEND_LASERTAG	LITERAL1
diff --git a/library.json b/library.json
index 5bd8d2e62..e230d58a0 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "IRremoteESP8266",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "keywords": "infrared, ir, remote, esp8266",
   "description": "Send and receive infrared signals with multiple protocols (ESP8266)",
   "repository":
diff --git a/library.properties b/library.properties
index 959eee82e..2cc679eeb 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=IRremoteESP8266
-version=2.4.0
+version=2.4.1
 author=Sebastien Warin, Mark Szabo, Ken Shirriff, David Conran
 maintainer=Mark Szabo, David Conran, Sebastien Warin, Roi Dayan, Massimiliano Pinto
 sentence=Send and receive infrared signals with multiple protocols (ESP8266)
diff --git a/src/IRremoteESP8266.h b/src/IRremoteESP8266.h
index f2b7bd12c..e4108e279 100644
--- a/src/IRremoteESP8266.h
+++ b/src/IRremoteESP8266.h
@@ -48,7 +48,7 @@
 #endif
 
 // Library Version
-#define _IRREMOTEESP8266_VERSION_ "2.4.0"
+#define _IRREMOTEESP8266_VERSION_ "2.4.1"
 // Supported IR protocols
 // Each protocol you include costs memory and, during decode, costs time
 // Disable (set to false) all the protocols you do not need/want!