diff --git a/CMakeLists.txt b/CMakeLists.txt
index dcba9166..6581f1f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ project(mosquitto)
 cmake_minimum_required(VERSION 2.8)
 # Only for version 3 and up. cmake_policy(SET CMP0042 NEW)
 
-set (VERSION 1.5.10)
+set (VERSION 1.5.11)
 
 add_definitions (-DCMAKE -DVERSION=\"${VERSION}\")
 
diff --git a/ChangeLog.txt b/ChangeLog.txt
index d6103a7a..e9f049ac 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -1,4 +1,4 @@
-1.5.11 - 2021-02-04
+1.5.11 - 2021-03-11
 ===================
 
 Security:
diff --git a/config.mk b/config.mk
index 3889e183..a354c987 100644
--- a/config.mk
+++ b/config.mk
@@ -105,7 +105,7 @@ WITH_BUNDLED_DEPS:=yes
 
 # Also bump lib/mosquitto.h, CMakeLists.txt,
 # installer/mosquitto.nsi, installer/mosquitto64.nsi
-VERSION=1.5.10
+VERSION=1.5.11
 
 # Client library SO version. Bump if incompatible API/ABI changes are made.
 SOVERSION=1
diff --git a/installer/mosquitto.nsi b/installer/mosquitto.nsi
index ab6d699b..9c45d7dc 100644
--- a/installer/mosquitto.nsi
+++ b/installer/mosquitto.nsi
@@ -9,7 +9,7 @@
 !define env_hklm 'HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"'
 
 Name "Eclipse Mosquitto"
-!define VERSION 1.5.10
+!define VERSION 1.5.11
 OutFile "mosquitto-${VERSION}-install-windows-x86.exe"
 
 InstallDir "$PROGRAMFILES\mosquitto"
diff --git a/installer/mosquitto64.nsi b/installer/mosquitto64.nsi
index bef20b9e..86d4b064 100644
--- a/installer/mosquitto64.nsi
+++ b/installer/mosquitto64.nsi
@@ -9,7 +9,7 @@
 !define env_hklm 'HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"'
 
 Name "Eclipse Mosquitto"
-!define VERSION 1.5.10
+!define VERSION 1.5.11
 OutFile "mosquitto-${VERSION}-install-windows-x64.exe"
 
 !include "x64.nsh"
diff --git a/lib/mosquitto.h b/lib/mosquitto.h
index e4782301..16885c15 100644
--- a/lib/mosquitto.h
+++ b/lib/mosquitto.h
@@ -47,7 +47,7 @@ extern "C" {
 
 #define LIBMOSQUITTO_MAJOR 1
 #define LIBMOSQUITTO_MINOR 5
-#define LIBMOSQUITTO_REVISION 10
+#define LIBMOSQUITTO_REVISION 11
 /* LIBMOSQUITTO_VERSION_NUMBER looks like 1002001 for e.g. version 1.2.1. */
 #define LIBMOSQUITTO_VERSION_NUMBER (LIBMOSQUITTO_MAJOR*1000000+LIBMOSQUITTO_MINOR*1000+LIBMOSQUITTO_REVISION)
 
diff --git a/set-version.sh b/set-version.sh
index 6d88e66c..19fa0463 100755
--- a/set-version.sh
+++ b/set-version.sh
@@ -2,7 +2,7 @@
 
 MAJOR=1
 MINOR=5
-REVISION=10
+REVISION=11
 
 sed -i "s/^VERSION=.*/VERSION=${MAJOR}.${MINOR}.${REVISION}/" config.mk
 
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 48404e03..77db4d34 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -1,5 +1,5 @@
 name: mosquitto
-version: 1.5.10
+version: 1.5.11
 summary: Eclipse Mosquitto MQTT broker
 description: This is a message broker that supports version 3.1 and 3.1.1 of the MQTT
     protocol.