diff --git a/Build/Changes.txt b/Build/Changes.txt
index 268204448..cd9defe8e 100644
--- a/Build/Changes.txt
+++ b/Build/Changes.txt
@@ -33,7 +33,7 @@ UCD - (UCD)ARDET is an Encoding Detector Library
 
 
 ========================================================
-Current BETA/RC Version 5.21.513.(build_#) (2021-05-13)
+Current BETA/RC Version 5.21.515.(build_#) (2021-05-15)
 ========================================================
 
 --------------------------------------------------------
@@ -71,6 +71,9 @@ NEW:
 CHANGES:
 --------------------------------------------------------
 [.###.#]- .
+[.515.1]- "grepWinNP3" based on current grepWin ver (boost v1.76 , upd: sktoolslib).
+[.515.1]- Add some more coding fonts to prefer over Consolas (if installed).
+[.515.1]- Linker: hardware-enforced stack-protection.
 [.513.1]- Canonicalize style section of .ini-settings.
 [.512.1]- Keep found initial common base default font in .ini.
 [.507.1]- Base64 Decoding: select source code-page for decoding.
@@ -113,7 +116,7 @@ CHANGES:
 [.302.1]- Prevent Path to URL conversion, if Hyperlink RegEx pattern does not match.
 [.301.1]- Enable Dark Mode feature for Win10 v21H1 insider beta.
 [.301.1]- EOL-Mode: status-bar double-click : inverted cyclic change rotation CRLF -> LF -> CR.
-[.411.1]- Update grepWinNP3 (GRE) version 2.1.7.36 (2021-04.07).
+[.515.1]- Update grepWinNP3 (GRE) version 2.1.7.37 (2021-05.14).
 [.429.1]- Update Oniguruma Regex (ONI) engine version 7.0.0 (2021-04-26).
 [.429.1]- Update Lexilla Library (LEX) version 5.0.2 (2021-04-23).
 [.429.1]- Update Scintilla Library (SCI) version 5.0.2 (2021-04-23).
diff --git a/Versions/day.txt b/Versions/day.txt
index 31cf34b8d..3cda32fc2 100644
--- a/Versions/day.txt
+++ b/Versions/day.txt
@@ -1 +1 @@
-513
+515
diff --git a/res/Notepad3.exe.manifest.conf b/res/Notepad3.exe.manifest.conf
index bff86febd..58e467391 100644
--- a/res/Notepad3.exe.manifest.conf
+++ b/res/Notepad3.exe.manifest.conf
@@ -3,7 +3,7 @@
   <assemblyIdentity
     name="Rizonesoft.Notepad3"
     processorArchitecture="*"
-    version="5.21.513.1"
+    version="5.21.515.1"
     type="win32"
   />
   <description>Notepad3 beta</description>
diff --git a/src/DarkMode/DarkMode.cpp b/src/DarkMode/DarkMode.cpp
index 9d23c8fb1..6fe494635 100644
--- a/src/DarkMode/DarkMode.cpp
+++ b/src/DarkMode/DarkMode.cpp
@@ -71,7 +71,7 @@ constexpr bool CheckBuildNumber(DWORD buildNumber)
     case 18363: // Win10 v1909
     case 19041: // Win10 v2004
     case 19042: // Win10 v20H2
-    case 19043: // Win10 v21H1 Insider Beta Channel [2021-03-15]
+    case 19043: // Win10 v21H1 Insider Beta and Release Preview Channels [2021-04-28]
     // unknown, if working with these version(s) :-O
     case 21382: // Win10 v21H2 Insider Dev Channel [2021-05-11]
         return true;
diff --git a/src/VersionEx.h b/src/VersionEx.h
index 5716e3f35..4cd5c3b6d 100644
--- a/src/VersionEx.h
+++ b/src/VersionEx.h
@@ -8,7 +8,7 @@
 #define SAPPNAME "Notepad3"
 #define VERSION_MAJOR 5
 #define VERSION_MINOR 21
-#define VERSION_REV 513
+#define VERSION_REV 515
 #define VERSION_BUILD 1
 #define SCINTILLA_VER 502
 #define LEXILLA_VER 502