diff --git a/data/syntax/sieve.xml b/data/syntax/sieve.xml
index 8c4c71a..448766a 100644
--- a/data/syntax/sieve.xml
+++ b/data/syntax/sieve.xml
@@ -1,152 +1,152 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE language SYSTEM "language.dtd">
 <!-- Highlighting for Sieve scripts (RFC 5228) and
      Sieve extensions published at https://www.iana.org/assignments/sieve-extensions/sieve-extensions.xhtml
 -->
 <language
     name="Sieve"
-    version="5"
+    version="6"
     kateversion="5.0"
     section="Scripts"
     extensions="*.siv;*.sieve"
     mimetype="application/sieve"
     author="Volker Krause (vkrause@kde.org)"
     license="MIT">
     <highlighting>
         <list name="keyword-list">
             <item>require</item>
             <item>if</item>
             <item>elsif</item>
             <item>else</item>
             <item>foreverypart</item>
             <item>global</item>
         </list>
         <list name="action-list">
             <item>addflag</item>
             <item>addheader</item>
             <item>break</item>
             <item>convert</item>
             <item>debug_log</item>
             <item>deleteheader</item>
             <item>discard</item>
             <item>enclose</item>
             <item>ereject</item>
             <item>error</item>
             <item>extracttext</item>
             <item>fileinto</item>
             <item>include</item>
             <item>keep</item>
             <item>notify</item>
             <item>redirect</item>
             <item>reject</item>
             <item>removeflag</item>
             <item>replace</item>
             <item>return</item>
             <item>setflag</item>
             <item>set</item>
             <item>stop</item>
             <item>vacation</item>
         </list>
         <list name="test-list">
             <item>address</item>
             <item>allof</item>
             <item>anyof</item>
             <item>body</item>
             <item>currentdate</item>
             <item>date</item>
             <item>duplicate</item>
             <item>envelope</item>
             <item>environment</item>
             <item>exists</item>
             <item>false</item>
             <item>hasflag</item>
             <item>header</item>
             <item>ihave</item>
             <item>mailboxexists</item>
             <item>metadata</item>
             <item>metadataexists</item>
             <item>not</item>
             <item>notify_method_capability</item>
             <item>servermetadata</item>
             <item>servermetadataexists</item>
             <item>spamtest</item>
             <item>size</item>
             <item>string</item>
             <item>true</item>
             <item>valid_notify_method</item>
             <item>virustest</item>
         </list>
         <list name="match-type-list">
             <item>:contains</item>
             <item>:count</item>
             <item>:is</item>
             <item>:matches</item>
             <item>:regex</item>
             <item>:value</item>
         </list>
 
         <contexts>
             <context name="normal-context" attribute="Normal Text" lineEndContext="#stay">
                 <DetectChar attribute="Comment" char="#" context="comment-context"/>
                 <Detect2Chars attribute="Comment" context="multiline-comment-context" char="/" char1="*" beginRegion="CommentRegion"/>
                 <keyword attribute="Keyword" context="#stay" String="keyword-list"/>
                 <keyword attribute="Action" context="#stay" String="action-list"/>
                 <keyword attribute="Test" context="#stay" String="test-list"/>
                 <keyword attribute="Match Type" context="#stay" String="match-type-list"/>
                 <DetectChar context="#stay" char="{" beginRegion="BlockRegion"/>
                 <DetectChar context="#stay" char="}" endRegion="BlockRegion"/>
                 <DetectChar attribute="String" context="string-context" char="&quot;"/>
                 <RegExpr attribute="Decimal" context="#stay" String="\d+[KMG]?"/>
                 <RegExpr attribute="String" context="multiline-string-context" String="text:$" beginRegion="StringRegion"/>
                 <RegExpr attribute="Argument" context="#stay" String=":\w+"/>
             </context>
 
             <context name="string-context" attribute="String" lineEndContext="#pop">
                 <LineContinue attribute="String" context="#stay"/>
                 <HlCStringChar attribute="Special Character" context="#stay"/>
                 <DetectChar attribute="String" context="#pop" char="&quot;"/>
                 <IncludeRules context="common-string-rules"/>
             </context>
             <context name="multiline-string-context" attribute="String" lineEndContext="#stay">
                 <RegExpr attribute="String" context="#pop" String="\.$" column="0" endRegion="StringRegion"/>
                 <HlCStringChar attribute="Special Character" context="#stay"/>
                 <IncludeRules context="common-string-rules"/>
             </context>
             <context name="common-string-rules" attribute="String" lineEndContext="#stay">
                 <RegExpr attribute="Variable" context="#stay" String="\$\{\w+\}"/>
                 <RegExpr attribute="Special Character" context="#stay" String="\$\{hex:[ 0-9a-f]+}" insensitive="true"/>
                 <RegExpr attribute="Special Character" context="#stay" String="\$\{unicode:[ 0-9a-f]+}" insensitive="true"/>
             </context>
 
             <context name="comment-context" lineEndContext="#pop" attribute="Comment">
                 <IncludeRules context="##Alerts"/>
             </context>
             <context name="multiline-comment-context" lineEndContext="#stay" attribute="Comment">
                 <Detect2Chars attribute="Comment" context="#pop" char="*" char1="/" endRegion="CommentRegion"/>
                 <IncludeRules context="##Alerts"/>
             </context>
         </contexts>
 
         <itemDatas>
             <itemData name="Normal Text" defStyleNum="dsNormal" spellChecking="false"/>
             <itemData name="Keyword" defStyleNum="dsKeyword" spellChecking="false"/>
             <itemData name="Decimal" defStyleNum="dsDecVal" spellChecking="false"/>
-            <itemData name="String" defStyleNum="dsString"/>
+            <itemData name="String" defStyleNum="dsString" spellChecking="false"/>
             <itemData name="Special Character" defStyleNum="dsChar" spellChecking="false"/>
             <itemData name="Comment" defStyleNum="dsComment"/>
             <itemData name="Action" defStyleNum="dsFunction" spellChecking="false"/>
             <itemData name="Test" defStyleNum="dsBuiltIn" spellChecking="false"/>
             <itemData name="Match Type" defStyleNum="dsExtension" spellChecking="false"/>
             <itemData name="Variable" defStyleNum="dsVariable" spellChecking="false"/>
             <itemData name="Argument" defStyleNum="dsOthers" spellChecking="false"/>
         </itemDatas>
     </highlighting>
 
     <general>
         <comments>
             <comment name="multiLine" start="/*" end="*/" region="CommentRegion"/>
             <comment name="singleLine" start="#"/>
         </comments>
         <keywords casesensitive="1" weakDeliminator=":"/>
     </general>
 </language>