diff --git a/appveyor.yml b/appveyor.yml
index 66323a60..89d127e3 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 0.8.2.{build}
+version: 0.9.0.{build}
 
 environment:
   matrix:
diff --git a/mdbx.h b/mdbx.h
index 384ffc09..c5704f5f 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -256,9 +256,9 @@ typedef pthread_t mdbx_tid_t;
 
 /*----------------------------------------------------------------------------*/
 
-/* MDBX version 0.8.2, released 2020-07-06 */
+/* MDBX version 0.9.x (development) */
 #define MDBX_VERSION_MAJOR 0
-#define MDBX_VERSION_MINOR 8
+#define MDBX_VERSION_MINOR 9
 
 #ifndef LIBMDBX_API
 #if defined(LIBMDBX_EXPORTS)
diff --git a/src/man1/mdbx_chk.1 b/src/man1/mdbx_chk.1
index d6292f33..dd6e4115 100644
--- a/src/man1/mdbx_chk.1
+++ b/src/man1/mdbx_chk.1
@@ -1,6 +1,6 @@
 .\" Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
 .\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.TH MDBX_CHK 1 "2020-06-05" "MDBX 0.8.x"
+.TH MDBX_CHK 1 "2020-07-31" "MDBX 0.9.x"
 .SH NAME
 mdbx_chk \- MDBX checking tool
 .SH SYNOPSIS
diff --git a/src/man1/mdbx_copy.1 b/src/man1/mdbx_copy.1
index 6c587abd..a4458e3a 100644
--- a/src/man1/mdbx_copy.1
+++ b/src/man1/mdbx_copy.1
@@ -2,7 +2,7 @@
 .\" Copyright 2012-2015 Howard Chu, Symas Corp. All Rights Reserved.
 .\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
 .\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.TH MDBX_COPY 1 "2020-06-05" "MDBX 0.8.x"
+.TH MDBX_COPY 1 "2020-07-31" "MDBX 0.9.x"
 .SH NAME
 mdbx_copy \- MDBX environment copy tool
 .SH SYNOPSIS
diff --git a/src/man1/mdbx_dump.1 b/src/man1/mdbx_dump.1
index 698b7cf4..d744aa5e 100644
--- a/src/man1/mdbx_dump.1
+++ b/src/man1/mdbx_dump.1
@@ -2,7 +2,7 @@
 .\" Copyright 2014-2015 Howard Chu, Symas Corp. All Rights Reserved.
 .\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
 .\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.TH MDBX_DUMP 1 "2020-06-05" "MDBX 0.8.x"
+.TH MDBX_DUMP 1 "2020-07-31" "MDBX 0.9.x"
 .SH NAME
 mdbx_dump \- MDBX environment export tool
 .SH SYNOPSIS
diff --git a/src/man1/mdbx_load.1 b/src/man1/mdbx_load.1
index bc3d737e..aae0ae56 100644
--- a/src/man1/mdbx_load.1
+++ b/src/man1/mdbx_load.1
@@ -2,7 +2,7 @@
 .\" Copyright 2014-2015 Howard Chu, Symas Corp. All Rights Reserved.
 .\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
 .\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.TH MDBX_LOAD 1 "2020-06-05" "MDBX 0.8.x"
+.TH MDBX_LOAD 1 "2020-07-31" "MDBX 0.9.x"
 .SH NAME
 mdbx_load \- MDBX environment import tool
 .SH SYNOPSIS
diff --git a/src/man1/mdbx_stat.1 b/src/man1/mdbx_stat.1
index f510d4e0..b018e6f5 100644
--- a/src/man1/mdbx_stat.1
+++ b/src/man1/mdbx_stat.1
@@ -2,7 +2,7 @@
 .\" Copyright 2012-2015 Howard Chu, Symas Corp. All Rights Reserved.
 .\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
 .\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.TH MDBX_STAT 1 "2020-06-05" "MDBX 0.8.x"
+.TH MDBX_STAT 1 "2020-07-31" "MDBX 0.9.x"
 .SH NAME
 mdbx_stat \- MDBX environment status tool
 .SH SYNOPSIS