diff --git a/Build/Changes.txt b/Build/Changes.txt
index f2aa230a7..2ea8922a2 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 5.21.527.(build_#) (2021-05-27)
+Current BETA/RC Version 5.21.529.(build_#) (2021-05-29)
 ========================================================
 
 --------------------------------------------------------
@@ -72,6 +72,7 @@ NEW:
 CHANGES:
 --------------------------------------------------------
 [.###.#]- .
+[.529.1]- Improved Julia Lexer (LEX).
 [.526.1]- Batch-Lexer + patching Markdown-Lexer (eolfilled header lines) (LEX).
 [.526.1]- Scheme-Dlg: dynamic (alloc) Style-Backup handling.
 [.525.1]- Update Lexilla Lib (bug fixes for Lexer: Markdown, Cmd/Batch) (LEX).
diff --git a/Versions/build.txt b/Versions/build.txt
index 0cfbf0888..d00491fd7 100644
--- a/Versions/build.txt
+++ b/Versions/build.txt
@@ -1 +1 @@
-2
+1
diff --git a/Versions/day.txt b/Versions/day.txt
index 678dee3e1..e83802d73 100644
--- a/Versions/day.txt
+++ b/Versions/day.txt
@@ -1 +1 @@
-527
+529
diff --git a/res/Notepad3.exe.manifest.conf b/res/Notepad3.exe.manifest.conf
index bf80e9dbc..92d9df8b4 100644
--- a/res/Notepad3.exe.manifest.conf
+++ b/res/Notepad3.exe.manifest.conf
@@ -3,8 +3,8 @@
   <assemblyIdentity
     name="Rizonesoft.Notepad3"
     processorArchitecture="*"
-    version="5.21.527.2"
+    version="5.21.529.1"
     type="win32"
   />
-  <description>Notepad3 alpha</description>
+  <description>Notepad3 beta</description>
 </assembly>
diff --git a/src/DarkMode/DarkMode.cpp b/src/DarkMode/DarkMode.cpp
index a7fec6a5e..0059f45dd 100644
--- a/src/DarkMode/DarkMode.cpp
+++ b/src/DarkMode/DarkMode.cpp
@@ -71,9 +71,9 @@ constexpr bool CheckBuildNumber(DWORD buildNumber)
     case 18363: // Win10 v1909
     case 19041: // Win10 v2004
     case 19042: // Win10 v20H2
-    case 19043: // Win10 v21H1 Insider Beta and Release Preview Channels [2021-04-28]
+    case 19043: // Win10 v21H1
     // unknown, if working with these version(s) :-O
-    case 21390: // Win10 v21H2 Insider Dev Channel [2021-05-21]
+    case 21390: // Win10 v21H2 Insider Dev and Preview Channels [2021-05-21]
         return true;
     default:
         // not supported
diff --git a/src/Helpers.c b/src/Helpers.c
index 3524158bb..7230d5bd8 100644
--- a/src/Helpers.c
+++ b/src/Helpers.c
@@ -213,11 +213,15 @@ static void _GetTrueWindowsVersion()
 #endif
 
 // ----------------------------------------------------------------------------
-// https://docs.microsoft.com/en-us/windows/release-information/
+// https://docs.microsoft.com/en-us/windows/release-health/release-information
 // ----------------------------------------------------------------------------
 static DWORD _Win10BuildToReleaseId(DWORD build)
 {
-    if (build >= 19042) {
+    if (build >= 21390) {
+        return 2109;
+    } else if (build >= 19043) {
+        return 2104;
+    } else if (build >= 19042) {
         return 2009;
     } else if (build >= 19041) {
         return 2004;
diff --git a/src/VersionEx.h b/src/VersionEx.h
index cff671976..8176d6ee8 100644
--- a/src/VersionEx.h
+++ b/src/VersionEx.h
@@ -8,13 +8,13 @@
 #define SAPPNAME "Notepad3"
 #define VERSION_MAJOR 5
 #define VERSION_MINOR 21
-#define VERSION_REV 527
-#define VERSION_BUILD 2
+#define VERSION_REV 529
+#define VERSION_BUILD 1
 #define SCINTILLA_VER 502
 #define LEXILLA_VER 502
 #define ONIGURUMA_REGEX_VER 7.0.0
 #define UCHARDET_VER 2018.09.27
 #define TINYEXPR_VER 2018.05.11
 #define UTHASH_VER 2.1.0
-#define VERSION_PATCH alpha
-#define VERSION_COMMIT_ID nebukadn
+#define VERSION_PATCH beta
+#define VERSION_COMMIT_ID dkt1-amr