diff --git a/fhem/CHANGED b/fhem/CHANGED
index 0e120dad1..072395972 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -1,5 +1,8 @@
 # Add changes at the top of the list. Keep it in ASCII, and 80-char wide.
 # Do not insert empty lines here, update check depends on it
+ - feature: 6.4 released
+
+- 2025-03-29 (6.3)
  - bugfix:  76_SolarForecast: fix sunalt for next day,
                               flowGraphicControl: new key strokeconsumerdyncol
  - bufgix: 72_FRITZBOX: set <name> lockLandevice <number|mac> <on|off|rt|rtoff>
diff --git a/fhem/Makefile b/fhem/Makefile
index 05eb38267..2a8fe9f1b 100644
--- a/fhem/Makefile
+++ b/fhem/Makefile
@@ -1,7 +1,7 @@
 # $Id$
 
-VERS=6.3
-DATE=2024-01-28
+VERS=6.4
+DATE=2025-03-29
 
 # used for nightly build
 DATEN=$(shell date +"%Y-%m-%d")
diff --git a/fhem/UPGRADE b/fhem/UPGRADE
index 6c147998f..0e7d98db1 100644
--- a/fhem/UPGRADE
+++ b/fhem/UPGRADE
@@ -58,3 +58,6 @@ enable the old feature.
 
 - 2024-01-28 (6.3) 
   - no known changes
+
+- 2025-03-29 (6.4) 
+  - no known changes
diff --git a/fhem/docs/fhem.html b/fhem/docs/fhem.html
index 45ec4226e..837b7bcd2 100644
--- a/fhem/docs/fhem.html
+++ b/fhem/docs/fhem.html
@@ -233,10 +233,10 @@
     <a name="Download"></a>
     <h3>Download</h3>
     <ul>
-      Last released version: (as of 2024-01-28): 
-      <a href="https://fhem.de/fhem-6.3.tar.gz">fhem-6.3.tar.gz</a>,
-      <a href="https://fhem.de/fhem-6.3.zip">fhem-6.3.zip</a>,
-      <a href="https://fhem.de/fhem-6.3.deb">fhem-6.3.deb</a>,
+      Last released version: (as of 2025-03-29): 
+      <a href="https://fhem.de/fhem-6.4.tar.gz">fhem-6.4.tar.gz</a>,
+      <a href="https://fhem.de/fhem-6.4.zip">fhem-6.4.zip</a>,
+      <a href="https://fhem.de/fhem-6.4.deb">fhem-6.4.deb</a>,
       <br>
       See the <a href="CHANGED">CHANGED</a> file for the change history or the 
       <a href="SVNLOG">svn log</a> for a more detailed log.<br><br>
@@ -263,7 +263,7 @@
     <ul>
     <h4>Debian/Ubuntu/Raspbian</h4>
     <ul>
-      <li>Install <a href="https://fhem.de/fhem-6.3.deb">this</a> package.
+      <li>Install <a href="https://fhem.de/fhem-6.4.deb">this</a> package.
       For a better integration check out <a
       href="https://debian.fhem.de/">debian.fhem.de</a>
     </ul>
@@ -274,7 +274,7 @@
           Device::SerialPort perl module, install it with "sudo cpan
           Device::SerialPort" or "apt-get install libdevice-serialport-perl".
           </li>
-      <li>Download the <a href="https://fhem.de/fhem-6.3.tar.gz">
+      <li>Download the <a href="https://fhem.de/fhem-6.4.tar.gz">
           .tar.gz</a> package, unpack it, and change to the unpacked directory.
       <li>start FHEM directly from this directory (perl fhem.pl fhem.cfg).
     </ul>
diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index 3d0fa8e84..9de8fdbc1 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -317,7 +317,7 @@ my $readytimeout = ($^O eq "MSWin32") ? 0.1 : 5.0;
 
 $init_done = 0;
 $lastDefChange = 0;
-$featurelevel = 6.3; # see also GlobalAttr
+$featurelevel = 6.4; # see also GlobalAttr
 $numCPUs = `grep -c ^processor /proc/cpuinfo 2>&1` if($^O eq "linux");
 $numCPUs = ($numCPUs && $numCPUs =~ m/(\d+)/ ? $1 : 1);
 
@@ -2928,7 +2928,7 @@ GlobalAttr($$$$)
   if($type eq "del") {
     my %noDel = ( modpath=>1, verbose=>1, logfile=>1, configfile=>1, encoding=>1 );
     return "The global attribute $name cannot be deleted" if($noDel{$name});
-    $featurelevel = 6.3 if($name eq "featurelevel");
+    $featurelevel = 6.4 if($name eq "featurelevel");
     $haveInet6    = 0   if($name eq "useInet6"); # IPv6
     delete($defs{global}{ignoreRegexpObj}) if($name eq "ignoreRegexp");
     return undef;