diff --git a/pom.xml b/pom.xml
index ba0e17fc7b..0521e36a83 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,17 +61,17 @@
     <developer>
       <id>jwayman</id>
       <name>Jeff Wayman</name>
-      <email></email>
+      <email/>
     </developer>
     <developer>
       <id>dcowden</id>
       <name>Dave Cowden</name>
-      <email></email>
+      <email/>
     </developer>
     <developer>
       <id>lawson89</id>
       <name>Richard Lawson</name>
-      <email></email>
+      <email/>
     </developer>
     <developer>
       <id>dougmorato</id>
@@ -146,7 +146,7 @@
     <webwolf.context>/</webwolf.context>
     <wiremock.version>2.27.2</wiremock.version>
     <xml-resolver.version>1.2</xml-resolver.version>
-    <xstream.version>1.4.5</xstream.version>
+    <xstream.version>1.4.21</xstream.version>
     <!-- do not update necessary for lesson -->
     <zxcvbn.version>1.8.0</zxcvbn.version>
   </properties>
@@ -582,8 +582,8 @@
               <includes>
                 <include>.gitignore</include>
               </includes>
-              <trimTrailingWhitespace></trimTrailingWhitespace>
-              <endWithNewline></endWithNewline>
+              <trimTrailingWhitespace/>
+              <endWithNewline/>
               <indent>
                 <tabs>true</tabs>
                 <spacesPerTab>4</spacesPerTab>
@@ -594,7 +594,7 @@
             <includes>
               <include>**/*.md</include>
             </includes>
-            <flexmark></flexmark>
+            <flexmark/>
           </markdown>
           <java>
             <includes>
@@ -602,7 +602,7 @@
               <include>src/test/java/**/*.java</include>
               <include>src/it/java/**/*.java</include>
             </includes>
-            <removeUnusedImports></removeUnusedImports>
+            <removeUnusedImports/>
             <googleJavaFormat>
               <style>GOOGLE</style>
               <reflowLongStrings>true</reflowLongStrings>