diff --git a/inc/infoutils.php b/inc/infoutils.php
index a334e09429390f91f09ce612f51f24ce997ba501..43df78a8c4c8933c8a81b321d04cfd6a2bbbb1fe 100644
--- a/inc/infoutils.php
+++ b/inc/infoutils.php
@@ -81,8 +81,8 @@ function check(){
 
     msg('DokuWiki version: '.getVersion(),1);
 
-    if(version_compare(phpversion(),'5.0.0','<')){
-        msg('Your PHP version is too old ('.phpversion().' vs. 5.0.0+ recommended)',-1);
+    if(version_compare(phpversion(),'5.1.2','<')){
+        msg('Your PHP version is too old ('.phpversion().' vs. 5.1.2+ needed)',-1);
     }else{
         msg('PHP version '.phpversion(),1);
     }
diff --git a/install.php b/install.php
index e11ba1d4a7b1414cfde119e1d1337959d8e741c9..ddbc46130967849e01088c3aaec284402b1064e5 100644
--- a/install.php
+++ b/install.php
@@ -423,8 +423,8 @@ function check_functions(){
     global $lang;
     $ok = true;
 
-    if(version_compare(phpversion(),'5.0.0','<')){
-        $error[] = sprintf($lang['i_phpver'],phpversion(),'5.0.0');
+    if(version_compare(phpversion(),'5.1.2','<')){
+        $error[] = sprintf($lang['i_phpver'],phpversion(),'5.1.2');
         $ok = false;
     }