diff --git a/changelog.txt b/changelog.txt
index b181431ff6e42..eb5cd6aecee1c 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,13 @@
+1.9.1 (2019-04-08)
+------------------------------------------------------------------------
+- Fix #6564: Enforce types of arguments for station name strings (#7419)
+- Fix #7433: Don't use AirportSpec substitute if it's not enabled (#7435)
+- Fix #7447, #7466, #7476: Missing NewGRF strings due to Action 4 feature check skipping pseudo-feature 48 (#7449)
+- Fix #6222: Advanced sprite layout sometimes showed incorrect railtype ground tile. (#7460)
+- Fix #7439: CompanyRemoveReason overwritten by ClientID (#7465)
+- Fix: [Windows] Incorrect error handling could lead to cascading error windows (#7482)
+- Fix #7478: Don't remove NewGRF objects on company take-over. (#7483)
+
 1.9.0 (2019-04-01)
 ------------------------------------------------------------------------
 - Fix #7411: Use industry production callback (if used) on initial industry cargo generation (#7412)
diff --git a/known-bugs.txt b/known-bugs.txt
index 760f3f64657be..7df6283c50ac7 100644
--- a/known-bugs.txt
+++ b/known-bugs.txt
@@ -1,6 +1,6 @@
 OpenTTD's known bugs
-Last updated:    2019-04-01
-Release version: 1.9.0
+Last updated:    2019-04-08
+Release version: 1.9.1
 ------------------------------------------------------------------------
 
 
diff --git a/os/debian/changelog b/os/debian/changelog
index 8c3b0cbf90af6..37b3cd7814e0e 100644
--- a/os/debian/changelog
+++ b/os/debian/changelog
@@ -1,3 +1,9 @@
+openttd (1.9.1-0) unstable; urgency=low
+
+  * New upstream release 1.9.1
+
+ -- OpenTTD <info@openttd.org>  Mon, 08 Apr 2019 20:00:00 +0100
+
 openttd (1.9.0-0) unstable; urgency=low
 
   * New upstream release 1.9.0
diff --git a/os/os2/installer/make_installer.cmd b/os/os2/installer/make_installer.cmd
index a15198b5f1ce8..f0a8401643fab 100644
--- a/os/os2/installer/make_installer.cmd
+++ b/os/os2/installer/make_installer.cmd
@@ -1,6 +1,6 @@
 @echo off
 
-set OPENTTD_VERSION=1.9.0
+set OPENTTD_VERSION=1.9.1
 set OPENSFX_VERSION=0.8.0
 set NOSOUND_VERSION=0.8.0
 set OPENGFX_VERSION=1.2.0
diff --git a/os/rpm/openttd.spec b/os/rpm/openttd.spec
index f19907a56cf2b..81f73543b9f97 100644
--- a/os/rpm/openttd.spec
+++ b/os/rpm/openttd.spec
@@ -17,9 +17,9 @@
 #
 
 Name:           openttd
-Version:        1.9
+Version:        1.9.1
 Release:        0
-%define srcver  1.9.0
+%define srcver  1.9.1
 Summary:        An open source reimplementation of Chris Sawyer's Transport Tycoon Deluxe
 License:        GPL-2.0
 Group:          Amusements/Games/Strategy/Other
diff --git a/os/windows/installer/install.nsi b/os/windows/installer/install.nsi
index 86a07e562c3a1..efd3310c95648 100644
--- a/os/windows/installer/install.nsi
+++ b/os/windows/installer/install.nsi
@@ -1,8 +1,8 @@
 # Version numbers to update
 !define APPV_MAJOR 1
 !define APPV_MINOR 9
-!define APPV_MAINT 0
-!define APPV_BUILD 5
+!define APPV_MAINT 1
+!define APPV_BUILD 0
 !define APPV_EXTRA ""
 
 !define APPNAME "OpenTTD"   ; Define application name
diff --git a/src/os/windows/ottdres.rc.in b/src/os/windows/ottdres.rc.in
index ebf0cc4afb9b9..6aa7ce216c23c 100644
--- a/src/os/windows/ottdres.rc.in
+++ b/src/os/windows/ottdres.rc.in
@@ -79,8 +79,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 1,9,0,!!ISODATE!!
- PRODUCTVERSION 1,9,0,!!ISODATE!!
+ FILEVERSION 1,9,1,!!ISODATE!!
+ PRODUCTVERSION 1,9,1,!!ISODATE!!
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
diff --git a/src/rev.cpp.in b/src/rev.cpp.in
index 2d58bb152de2f..e77fee48acb68 100644
--- a/src/rev.cpp.in
+++ b/src/rev.cpp.in
@@ -82,7 +82,7 @@ const byte _openttd_revision_tagged = !!ISTAG!!;
  * final release will always have a lower version number than the released
  * version, thus making comparisons on specific revisions easy.
  */
-const uint32 _openttd_newgrf_version = 1 << 28 | 9 << 24 | 0 << 20 | !!ISSTABLETAG!! << 19 | 28004;
+const uint32 _openttd_newgrf_version = 1 << 28 | 9 << 24 | 1 << 20 | !!ISSTABLETAG!! << 19 | 28004;
 
 #ifdef __MORPHOS__
 /**