diff --git a/plugins/maven/src/main/java/org/jetbrains/idea/maven/buildtool/quickfix/UpdateXmlsTo410.kt b/plugins/maven/src/main/java/org/jetbrains/idea/maven/buildtool/quickfix/UpdateXmlsTo410.kt
index 2b71d5dde33e..12f455338e16 100644
--- a/plugins/maven/src/main/java/org/jetbrains/idea/maven/buildtool/quickfix/UpdateXmlsTo410.kt
+++ b/plugins/maven/src/main/java/org/jetbrains/idea/maven/buildtool/quickfix/UpdateXmlsTo410.kt
@@ -12,7 +12,7 @@ import org.jetbrains.idea.maven.model.MavenConstants.MAVEN_4_XLMNS
 import org.jetbrains.idea.maven.model.MavenConstants.MAVEN_4_XSD
 import org.jetbrains.idea.maven.project.MavenProjectBundle
 
-internal class UpdateXmlsTo410 : LocalQuickFix {
+class UpdateXmlsTo410 : LocalQuickFix {
   override fun getName(): String {
     return MavenProjectBundle.message("maven.project.updating.model.command.name", "modelVersion")
   }
@@ -24,7 +24,11 @@ internal class UpdateXmlsTo410 : LocalQuickFix {
   override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
 
     val rootTag = findProjectTag(descriptor) ?: return
+    val xmlnsXsi = rootTag.getAttribute("xmlns:xsi")
     rootTag.setAttribute("xmlns", MAVEN_4_XLMNS)
+    if (xmlnsXsi == null) {
+      rootTag.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance")
+    }
     rootTag.setAttribute("xsi:schemaLocation", "$MAVEN_4_XLMNS $MAVEN_4_XSD")
     val modelVersion = rootTag.findSubTags("modelVersion")
     if (modelVersion.isNotEmpty()) {
diff --git a/plugins/maven/src/main/java/org/jetbrains/idea/maven/externalSystemIntegration/output/quickfixes/Maven4ModelVersionErrorParser.kt b/plugins/maven/src/main/java/org/jetbrains/idea/maven/externalSystemIntegration/output/quickfixes/Maven4ModelVersionErrorParser.kt
index a7d21a25b2bd..37622d6492f5 100644
--- a/plugins/maven/src/main/java/org/jetbrains/idea/maven/externalSystemIntegration/output/quickfixes/Maven4ModelVersionErrorParser.kt
+++ b/plugins/maven/src/main/java/org/jetbrains/idea/maven/externalSystemIntegration/output/quickfixes/Maven4ModelVersionErrorParser.kt
@@ -13,7 +13,6 @@ import com.intellij.openapi.application.EDT
 import com.intellij.openapi.application.readAction
 import com.intellij.openapi.application.writeAction
 import com.intellij.openapi.command.executeCommand
-import com.intellij.openapi.components.service
 import com.intellij.openapi.fileEditor.FileDocumentManager
 import com.intellij.openapi.progress.Cancellation.checkCancelled
 import com.intellij.openapi.progress.runBlockingMaybeCancellable
@@ -44,7 +43,6 @@ import org.jetbrains.idea.maven.project.MavenProject
 import org.jetbrains.idea.maven.project.MavenProjectBundle
 import org.jetbrains.idea.maven.project.MavenProjectsManager
 import org.jetbrains.idea.maven.utils.MavenCoroutineScopeProvider
-import org.jetbrains.idea.maven.utils.MavenLog
 import java.nio.file.Path
 import java.util.concurrent.CompletableFuture
 import java.util.function.Consumer
@@ -211,9 +209,12 @@ class UpdateVersionQuickFix(val path: Path) : BuildIssueQuickFix {
               if (modelVersion.exists()) {
                 modelVersion.stringValue = MavenConstants.MODEL_VERSION_4_1_0
               }
-              val rootTag = psiFile.document?.rootTag
-              rootTag?.setAttribute("xmlns", NEW_XMLNS)
-              rootTag?.setAttribute("xsi:schemaLocation", NEW_SCHEMA_LOCATION)
+              val rootTag = psiFile.document?.rootTag ?: return@executeCommand
+              if (rootTag.getAttribute("xmlns:xsi") == null) {
+                rootTag.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance")
+              }
+              rootTag.setAttribute("xmlns", NEW_XMLNS)
+              rootTag.setAttribute("xsi:schemaLocation", NEW_SCHEMA_LOCATION)
             }
 
             documentManager.doPostponedOperationsAndUnblockDocument(document)
diff --git a/plugins/maven/src/test/java/org/jetbrains/idea/maven/quickfixes/UpdateXmlTo410Test.kt b/plugins/maven/src/test/java/org/jetbrains/idea/maven/quickfixes/UpdateXmlTo410Test.kt
new file mode 100644
index 000000000000..daf0a169eb24
--- /dev/null
+++ b/plugins/maven/src/test/java/org/jetbrains/idea/maven/quickfixes/UpdateXmlTo410Test.kt
@@ -0,0 +1,58 @@
+// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package org.jetbrains.idea.maven.quickfixes
+
+import com.intellij.codeInspection.ProblemDescriptor
+import com.intellij.openapi.application.readAction
+import com.intellij.openapi.command.writeCommandAction
+import com.intellij.psi.xml.XmlFile
+import com.intellij.testFramework.fixtures.LightJavaCodeInsightFixtureTestCase
+import kotlinx.coroutines.runBlocking
+import org.jetbrains.idea.maven.buildtool.quickfix.UpdateXmlsTo410
+import org.jetbrains.idea.maven.model.MavenConstants
+import org.jetbrains.idea.maven.model.MavenConstants.MAVEN_4_XLMNS
+import org.jetbrains.idea.maven.model.MavenConstants.MAVEN_4_XSD
+import org.mockito.Mockito.mock
+import org.mockito.Mockito.`when`
+
+class UpdateXmlsTo410Test : LightJavaCodeInsightFixtureTestCase() {
+
+  private lateinit var quickFix: UpdateXmlsTo410
+
+  override fun setUp() {
+    super.setUp()
+    quickFix = UpdateXmlsTo410()
+  }
+
+  override fun runInDispatchThread(): Boolean {
+    return false
+  }
+
+  fun testUpdateMavenXmlTo410() = runBlocking {
+    val xmlContent = """
+      <?xml version="1.0" encoding="UTF-8"?>
+      <project xmlns="http://maven.apache.org/POM/4.0.0">
+        <modelVersion>4.0.0</modelVersion>
+      </project>
+    """.trimIndent()
+
+    val xmlFile = myFixture.configureByText("pom.xml", xmlContent) as XmlFile
+    val projectTag = readAction { xmlFile.document?.rootTag }
+
+    val descriptor = mock(ProblemDescriptor::class.java)
+    `when`(descriptor.psiElement).thenReturn(projectTag)
+
+    writeCommandAction(project, quickFix.name) {
+      quickFix.applyFix(project, descriptor)
+    }
+
+    readAction {
+      val updatedProjectTag = xmlFile.document?.rootTag
+      assertEquals(MavenConstants.MAVEN_4_XLMNS, updatedProjectTag?.getAttribute("xmlns")?.value)
+      assertEquals("http://www.w3.org/2001/XMLSchema-instance", updatedProjectTag?.getAttribute("xmlns:xsi")?.value)
+      assertEquals("$MAVEN_4_XLMNS $MAVEN_4_XSD", updatedProjectTag?.getAttribute("xsi:schemaLocation")?.value)
+      assertEquals(MavenConstants.MODEL_VERSION_4_1_0,
+                   updatedProjectTag?.findFirstSubTag("modelVersion")?.value?.text)
+    }
+
+  }
+}
\ No newline at end of file