diff --git a/src/file/core-properties/properties.ts b/src/file/core-properties/properties.ts
index d51b1f23b7b..9019a5f8c3f 100644
--- a/src/file/core-properties/properties.ts
+++ b/src/file/core-properties/properties.ts
@@ -1,7 +1,7 @@
 import { ICommentsOptions } from "@file/paragraph/run/comment-run";
 import { ICompatibilityOptions } from "@file/settings/compatibility";
 import { FontOptions } from "@file/fonts/font-table";
-import { StringContainer, XmlComponent } from "@file/xml-components";
+import { StringContainer, XmlAttributeComponent, XmlComponent } from "@file/xml-components";
 import { dateTimeValue } from "@util/values";
 
 import { ICustomPropertyOptions } from "../custom-properties";
@@ -71,15 +71,7 @@ export interface IPropertiesOptions {
 export class CoreProperties extends XmlComponent {
     public constructor(options: Omit<IPropertiesOptions, "sections">) {
         super("cp:coreProperties");
-        this.root.push(
-            new DocumentAttributes({
-                cp: "http://schemas.openxmlformats.org/package/2006/metadata/core-properties",
-                dc: "http://purl.org/dc/elements/1.1/",
-                dcterms: "http://purl.org/dc/terms/",
-                dcmitype: "http://purl.org/dc/dcmitype/",
-                xsi: "http://www.w3.org/2001/XMLSchema-instance",
-            }),
-        );
+        this.root.push(new DocumentAttributes(["cp", "dc", "dcterms", "dcmitype", "xsi"]));
         if (options.title) {
             this.root.push(new StringContainer("dc:title", options.title));
         }
@@ -106,11 +98,15 @@ export class CoreProperties extends XmlComponent {
     }
 }
 
+class TimestampElementProperties extends XmlAttributeComponent<{ readonly type: string }> {
+    protected readonly xmlKeys = { type: "xsi:type" };
+}
+
 class TimestampElement extends XmlComponent {
     public constructor(name: string) {
         super(name);
         this.root.push(
-            new DocumentAttributes({
+            new TimestampElementProperties({
                 type: "dcterms:W3CDTF",
             }),
         );
diff --git a/src/file/document/document-attributes.ts b/src/file/document/document-attributes.ts
index e919fa3de51..b5d9b336428 100644
--- a/src/file/document/document-attributes.ts
+++ b/src/file/document/document-attributes.ts
@@ -1,89 +1,60 @@
 import { XmlAttributeComponent } from "@file/xml-components";
 
 /* cSpell:disable */
-export interface IDocumentAttributesProperties {
-    readonly wpc?: string;
-    readonly mc?: string;
-    readonly o?: string;
-    readonly r?: string;
-    readonly m?: string;
-    readonly v?: string;
-    readonly wp14?: string;
-    readonly wp?: string;
-    readonly w10?: string;
-    readonly w?: string;
-    readonly w14?: string;
-    readonly w15?: string;
-    readonly wpg?: string;
-    readonly wpi?: string;
-    readonly wne?: string;
-    readonly wps?: string;
-    readonly Ignorable?: string;
-    readonly cp?: string;
-    readonly dc?: string;
-    readonly dcterms?: string;
-    readonly dcmitype?: string;
-    readonly xsi?: string;
-    readonly type?: string;
-    readonly cx?: string;
-    readonly cx1?: string;
-    readonly cx2?: string;
-    readonly cx3?: string;
-    readonly cx4?: string;
-    readonly cx5?: string;
-    readonly cx6?: string;
-    readonly cx7?: string;
-    readonly cx8?: string;
-    readonly aink?: string;
-    readonly am3d?: string;
-    readonly w16cex?: string;
-    readonly w16cid?: string;
-    readonly w16?: string;
-    readonly w16sdtdh?: string;
-    readonly w16se?: string;
-}
+export const DocumentAttributeNamespaces = {
+    wpc: "http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas",
+    mc: "http://schemas.openxmlformats.org/markup-compatibility/2006",
+    o: "urn:schemas-microsoft-com:office:office",
+    r: "http://schemas.openxmlformats.org/officeDocument/2006/relationships",
+    m: "http://schemas.openxmlformats.org/officeDocument/2006/math",
+    v: "urn:schemas-microsoft-com:vml",
+    wp14: "http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing",
+    wp: "http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing",
+    w10: "urn:schemas-microsoft-com:office:word",
+    w: "http://schemas.openxmlformats.org/wordprocessingml/2006/main",
+    w14: "http://schemas.microsoft.com/office/word/2010/wordml",
+    w15: "http://schemas.microsoft.com/office/word/2012/wordml",
+    wpg: "http://schemas.microsoft.com/office/word/2010/wordprocessingGroup",
+    wpi: "http://schemas.microsoft.com/office/word/2010/wordprocessingInk",
+    wne: "http://schemas.microsoft.com/office/word/2006/wordml",
+    wps: "http://schemas.microsoft.com/office/word/2010/wordprocessingShape",
+    cp: "http://schemas.openxmlformats.org/package/2006/metadata/core-properties",
+    dc: "http://purl.org/dc/elements/1.1/",
+    dcterms: "http://purl.org/dc/terms/",
+    dcmitype: "http://purl.org/dc/dcmitype/",
+    xsi: "http://www.w3.org/2001/XMLSchema-instance",
+    cx: "http://schemas.microsoft.com/office/drawing/2014/chartex",
+    cx1: "http://schemas.microsoft.com/office/drawing/2015/9/8/chartex",
+    cx2: "http://schemas.microsoft.com/office/drawing/2015/10/21/chartex",
+    cx3: "http://schemas.microsoft.com/office/drawing/2016/5/9/chartex",
+    cx4: "http://schemas.microsoft.com/office/drawing/2016/5/10/chartex",
+    cx5: "http://schemas.microsoft.com/office/drawing/2016/5/11/chartex",
+    cx6: "http://schemas.microsoft.com/office/drawing/2016/5/12/chartex",
+    cx7: "http://schemas.microsoft.com/office/drawing/2016/5/13/chartex",
+    cx8: "http://schemas.microsoft.com/office/drawing/2016/5/14/chartex",
+    aink: "http://schemas.microsoft.com/office/drawing/2016/ink",
+    am3d: "http://schemas.microsoft.com/office/drawing/2017/model3d",
+    w16cex: "http://schemas.microsoft.com/office/word/2018/wordml/cex",
+    w16cid: "http://schemas.microsoft.com/office/word/2016/wordml/cid",
+    w16: "http://schemas.microsoft.com/office/word/2018/wordml",
+    w16sdtdh: "http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash",
+    w16se: "http://schemas.microsoft.com/office/word/2015/wordml/symex",
+};
 /* cSpell:enable */
 
+export type DocumentAttributeNamespace = keyof typeof DocumentAttributeNamespaces;
+
+export type IDocumentAttributesProperties = Partial<Record<DocumentAttributeNamespace, string>> & {
+    readonly Ignorable?: string;
+};
+
 export class DocumentAttributes extends XmlAttributeComponent<IDocumentAttributesProperties> {
     protected readonly xmlKeys = {
-        wpc: "xmlns:wpc",
-        mc: "xmlns:mc",
-        o: "xmlns:o",
-        r: "xmlns:r",
-        m: "xmlns:m",
-        v: "xmlns:v",
-        wp14: "xmlns:wp14",
-        wp: "xmlns:wp",
-        w10: "xmlns:w10",
-        w: "xmlns:w",
-        w14: "xmlns:w14",
-        w15: "xmlns:w15",
-        wpg: "xmlns:wpg",
-        wpi: "xmlns:wpi",
-        wne: "xmlns:wne",
-        wps: "xmlns:wps",
         Ignorable: "mc:Ignorable",
-        cp: "xmlns:cp",
-        dc: "xmlns:dc",
-        dcterms: "xmlns:dcterms",
-        dcmitype: "xmlns:dcmitype",
-        xsi: "xmlns:xsi",
-        type: "xsi:type",
-        cx: "xmlns:cx",
-        cx1: "xmlns:cx1",
-        cx2: "xmlns:cx2",
-        cx3: "xmlns:cx3",
-        cx4: "xmlns:cx4",
-        cx5: "xmlns:cx5",
-        cx6: "xmlns:cx6",
-        cx7: "xmlns:cx7",
-        cx8: "xmlns:cx8",
-        aink: "xmlns:aink",
-        am3d: "xmlns:am3d",
-        w16cex: "xmlns:w16cex",
-        w16cid: "xmlns:w16cid",
-        w16: "xmlns:w16",
-        w16sdtdh: "xmlns:w16sdtdh",
-        w16se: "xmlns:w16se",
+        ...Object.fromEntries(Object.keys(DocumentAttributeNamespaces).map((key) => [key, `xmlns:${key}`])),
     };
+
+    public constructor(ns: readonly DocumentAttributeNamespace[], Ignorable?: string) {
+        super({ Ignorable, ...Object.fromEntries(ns.map((n) => [n, DocumentAttributeNamespaces[n]])) });
+    }
 }
diff --git a/src/file/document/document.ts b/src/file/document/document.ts
index e1b098d9cb5..ecf2a172807 100644
--- a/src/file/document/document.ts
+++ b/src/file/document/document.ts
@@ -36,41 +36,43 @@ export class Document extends XmlComponent {
     public constructor(options: IDocumentOptions) {
         super("w:document");
         this.root.push(
-            new DocumentAttributes({
-                wpc: "http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas",
-                mc: "http://schemas.openxmlformats.org/markup-compatibility/2006",
-                o: "urn:schemas-microsoft-com:office:office",
-                r: "http://schemas.openxmlformats.org/officeDocument/2006/relationships",
-                m: "http://schemas.openxmlformats.org/officeDocument/2006/math",
-                v: "urn:schemas-microsoft-com:vml",
-                wp14: "http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing",
-                wp: "http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing",
-                w10: "urn:schemas-microsoft-com:office:word",
-                w: "http://schemas.openxmlformats.org/wordprocessingml/2006/main",
-                w14: "http://schemas.microsoft.com/office/word/2010/wordml",
-                w15: "http://schemas.microsoft.com/office/word/2012/wordml",
-                wpg: "http://schemas.microsoft.com/office/word/2010/wordprocessingGroup",
-                wpi: "http://schemas.microsoft.com/office/word/2010/wordprocessingInk",
-                wne: "http://schemas.microsoft.com/office/word/2006/wordml",
-                wps: "http://schemas.microsoft.com/office/word/2010/wordprocessingShape",
-                cx: "http://schemas.microsoft.com/office/drawing/2014/chartex",
-                cx1: "http://schemas.microsoft.com/office/drawing/2015/9/8/chartex",
-                cx2: "http://schemas.microsoft.com/office/drawing/2015/10/21/chartex",
-                cx3: "http://schemas.microsoft.com/office/drawing/2016/5/9/chartex",
-                cx4: "http://schemas.microsoft.com/office/drawing/2016/5/10/chartex",
-                cx5: "http://schemas.microsoft.com/office/drawing/2016/5/11/chartex",
-                cx6: "http://schemas.microsoft.com/office/drawing/2016/5/12/chartex",
-                cx7: "http://schemas.microsoft.com/office/drawing/2016/5/13/chartex",
-                cx8: "http://schemas.microsoft.com/office/drawing/2016/5/14/chartex",
-                aink: "http://schemas.microsoft.com/office/drawing/2016/ink",
-                am3d: "http://schemas.microsoft.com/office/drawing/2017/model3d",
-                w16cex: "http://schemas.microsoft.com/office/word/2018/wordml/cex",
-                w16cid: "http://schemas.microsoft.com/office/word/2016/wordml/cid",
-                w16: "http://schemas.microsoft.com/office/word/2018/wordml",
-                w16sdtdh: "http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash",
-                w16se: "http://schemas.microsoft.com/office/word/2015/wordml/symex",
-                Ignorable: "w14 w15 wp14",
-            }),
+            new DocumentAttributes(
+                [
+                    "wpc",
+                    "mc",
+                    "o",
+                    "r",
+                    "m",
+                    "v",
+                    "wp14",
+                    "wp",
+                    "w10",
+                    "w",
+                    "w14",
+                    "w15",
+                    "wpg",
+                    "wpi",
+                    "wne",
+                    "wps",
+                    "cx",
+                    "cx1",
+                    "cx2",
+                    "cx3",
+                    "cx4",
+                    "cx5",
+                    "cx6",
+                    "cx7",
+                    "cx8",
+                    "aink",
+                    "am3d",
+                    "w16cex",
+                    "w16cid",
+                    "w16",
+                    "w16sdtdh",
+                    "w16se",
+                ],
+                "w14 w15 wp14",
+            ),
         );
         this.body = new Body();
         if (options.background) {
diff --git a/src/file/numbering/numbering.ts b/src/file/numbering/numbering.ts
index daf9ca38c78..d7e7440aede 100644
--- a/src/file/numbering/numbering.ts
+++ b/src/file/numbering/numbering.ts
@@ -37,25 +37,10 @@ export class Numbering extends XmlComponent {
     public constructor(options: INumberingOptions) {
         super("w:numbering");
         this.root.push(
-            new DocumentAttributes({
-                wpc: "http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas",
-                mc: "http://schemas.openxmlformats.org/markup-compatibility/2006",
-                o: "urn:schemas-microsoft-com:office:office",
-                r: "http://schemas.openxmlformats.org/officeDocument/2006/relationships",
-                m: "http://schemas.openxmlformats.org/officeDocument/2006/math",
-                v: "urn:schemas-microsoft-com:vml",
-                wp14: "http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing",
-                wp: "http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing",
-                w10: "urn:schemas-microsoft-com:office:word",
-                w: "http://schemas.openxmlformats.org/wordprocessingml/2006/main",
-                w14: "http://schemas.microsoft.com/office/word/2010/wordml",
-                w15: "http://schemas.microsoft.com/office/word/2012/wordml",
-                wpg: "http://schemas.microsoft.com/office/word/2010/wordprocessingGroup",
-                wpi: "http://schemas.microsoft.com/office/word/2010/wordprocessingInk",
-                wne: "http://schemas.microsoft.com/office/word/2006/wordml",
-                wps: "http://schemas.microsoft.com/office/word/2010/wordprocessingShape",
-                Ignorable: "w14 w15 wp14",
-            }),
+            new DocumentAttributes(
+                ["wpc", "mc", "o", "r", "m", "v", "wp14", "wp", "w10", "w", "w14", "w15", "wpg", "wpi", "wne", "wps"],
+                "w14 w15 wp14",
+            ),
         );
 
         const abstractNumbering = new AbstractNumbering(this.abstractNumUniqueNumericId(), [
diff --git a/src/file/styles/factory.ts b/src/file/styles/factory.ts
index 63ac2571d2c..7bbddb8f2b5 100644
--- a/src/file/styles/factory.ts
+++ b/src/file/styles/factory.ts
@@ -39,14 +39,7 @@ export interface IDefaultStylesOptions {
 
 export class DefaultStylesFactory {
     public newInstance(options: IDefaultStylesOptions = {}): IStylesOptions {
-        const documentAttributes = new DocumentAttributes({
-            mc: "http://schemas.openxmlformats.org/markup-compatibility/2006",
-            r: "http://schemas.openxmlformats.org/officeDocument/2006/relationships",
-            w: "http://schemas.openxmlformats.org/wordprocessingml/2006/main",
-            w14: "http://schemas.microsoft.com/office/word/2010/wordml",
-            w15: "http://schemas.microsoft.com/office/word/2012/wordml",
-            Ignorable: "w14 w15",
-        });
+        const documentAttributes = new DocumentAttributes(["mc", "r", "w", "w14", "w15"], "w14 w15");
         return {
             initialStyles: documentAttributes,
             importedStyles: [
diff --git a/src/patcher/from-docx.ts b/src/patcher/from-docx.ts
index ff9b3ea8480..75b664d0bf9 100644
--- a/src/patcher/from-docx.ts
+++ b/src/patcher/from-docx.ts
@@ -1,6 +1,7 @@
 import JSZip from "jszip";
 import { Element, js2xml } from "xml-js";
 
+import { DocumentAttributeNamespaces } from "@file/document";
 import { ConcreteHyperlink, ExternalHyperlink, ParagraphChild } from "@file/paragraph";
 import { FileChild } from "@file/file-child";
 import { IMediaData, Media } from "@file/media";
@@ -100,6 +101,24 @@ export const patchDocument = async <T extends PatchDocumentOutputType = PatchDoc
         }
 
         const json = toJson(await value.async("text"));
+
+        if (key === "word/document.xml") {
+            const document = json.elements?.find((i) => i.name === "w:document");
+            if (document) {
+                // We could check all namespaces from Document, but we'll instead
+                // check only those that may be used by our element types.
+
+                // eslint-disable-next-line functional/immutable-data
+                document.attributes = document.attributes ?? {};
+                for (const ns of ["mc", "wp", "r", "w15", "m"] as const) {
+                    // eslint-disable-next-line functional/immutable-data
+                    document.attributes[`xmlns:${ns}`] = DocumentAttributeNamespaces[ns];
+                }
+                // eslint-disable-next-line functional/immutable-data
+                document.attributes["mc:Ignorable"] = `${document.attributes["mc:Ignorable"] || ""} w15`.trim();
+            }
+        }
+
         if (key.startsWith("word/") && !key.endsWith(".xml.rels")) {
             const context: IContext = {
                 file,