diff --git a/appveyor.yml b/appveyor.yml
index 61675c08..9bf3ea04 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 0.10.5.{build}
+version: 0.11.0.{build}
 
 environment:
   matrix:
diff --git a/mdbx.h b/mdbx.h
index 34bb1dfc..2a9f56fa 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -568,9 +568,9 @@ typedef mode_t mdbx_mode_t;
 extern "C" {
 #endif
 
-/* MDBX version 0.10.x */
+/* MDBX version 0.11.x */
 #define MDBX_VERSION_MAJOR 0
-#define MDBX_VERSION_MINOR 10
+#define MDBX_VERSION_MINOR 11
 
 #ifndef LIBMDBX_API
 #if defined(LIBMDBX_EXPORTS)
diff --git a/src/core.c b/src/core.c
index f61137ab..80a2a963 100644
--- a/src/core.c
+++ b/src/core.c
@@ -10124,7 +10124,8 @@ static int mdbx_validate_meta(MDBX_env *env, MDBX_meta *const meta,
   const uint64_t magic_and_version =
       unaligned_peek_u64(4, &meta->mm_magic_and_version);
   if (unlikely(magic_and_version != MDBX_DATA_MAGIC &&
-               magic_and_version != MDBX_DATA_MAGIC_DEVEL)) {
+               magic_and_version != MDBX_DATA_MAGIC_LEGACY_COMPAT &&
+               magic_and_version != MDBX_DATA_MAGIC_LEGACY_DEVEL)) {
     mdbx_error("meta[%u] has invalid magic/version %" PRIx64, meta_number,
                magic_and_version);
     return ((magic_and_version >> 8) != MDBX_MAGIC) ? MDBX_INVALID
diff --git a/src/internals.h b/src/internals.h
index 4c7738ee..a3ba11b1 100644
--- a/src/internals.h
+++ b/src/internals.h
@@ -384,7 +384,7 @@ MDBX_MAYBE_UNUSED static
 #define MDBX_MAGIC UINT64_C(/* 56-bit prime */ 0x59659DBDEF4C11)
 
 /* FROZEN: The version number for a database's datafile format. */
-#define MDBX_DATA_VERSION 2
+#define MDBX_DATA_VERSION 3
 /* The version number for a database's lockfile format. */
 #define MDBX_LOCK_VERSION 4
 
@@ -789,7 +789,11 @@ typedef struct MDBX_lockinfo {
 
 #define MDBX_DATA_MAGIC                                                        \
   ((MDBX_MAGIC << 8) + MDBX_PNL_ASCENDING * 64 + MDBX_DATA_VERSION)
-#define MDBX_DATA_MAGIC_DEVEL ((MDBX_MAGIC << 8) + 255)
+
+#define MDBX_DATA_MAGIC_LEGACY_COMPAT                                          \
+  ((MDBX_MAGIC << 8) + MDBX_PNL_ASCENDING * 64 + 2)
+
+#define MDBX_DATA_MAGIC_LEGACY_DEVEL ((MDBX_MAGIC << 8) + 255)
 
 #define MDBX_LOCK_MAGIC ((MDBX_MAGIC << 8) + MDBX_LOCK_VERSION)