diff --git a/src/pages/api/assignments/[id]/export.tsx b/src/pages/api/assignments/[id]/export.tsx
index d38be031..91b24506 100644
--- a/src/pages/api/assignments/[id]/export.tsx
+++ b/src/pages/api/assignments/[id]/export.tsx
@@ -106,18 +106,20 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 			results: any;
 			exams: {module: Module}[];
 			startDate: string;
-			pdf?: string;
+			pdf: {
+				path: string,
+				version: string,
+			},
 		};
 		if (!data) {
 			res.status(400).end();
 			return;
 		}
 
-		if (data.pdf) {
+		if (data.pdf && data.pdf.path && data.pdf.version === process.env.PDF_VERSION) {
 			// if it does, return the pdf url
-			const fileRef = ref(storage, data.pdf);
+			const fileRef = ref(storage, data.pdf.path);
 			const url = await getDownloadURL(fileRef);
-
 			res.status(200).end(url);
 			return;
 		}
@@ -387,7 +389,10 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 
 				// update the stats entries with the pdf url to prevent duplication
 				await updateDoc(docSnap.ref, {
-					pdf: refName,
+					pdf: {
+						path: refName,
+						version: process.env.PDF_VERSION,
+					},
 				});
 				const url = await getDownloadURL(fileRef);
 				res.status(200).end(url);
@@ -419,8 +424,8 @@ async function get(req: NextApiRequest, res: NextApiResponse) {
 			return;
 		}
 
-		if (data.pdf) {
-			const fileRef = ref(storage, data.pdf);
+		if (data.pdf?.path) {
+			const fileRef = ref(storage, data.pdf.path);
 			const url = await getDownloadURL(fileRef);
 			return res.redirect(url);
 		}
diff --git a/src/pages/api/stats/[id]/export.tsx b/src/pages/api/stats/[id]/export.tsx
index 2736bccf..657cb361 100644
--- a/src/pages/api/stats/[id]/export.tsx
+++ b/src/pages/api/stats/[id]/export.tsx
@@ -125,7 +125,7 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 
 		const stats = docsSnap.docs.map((d) => d.data());
 		// verify if the stats already have a pdf generated
-		const hasPDF = stats.find((s) => s.pdf);
+		const hasPDF = stats.find((s) => s.pdf?.path && s.pdf?.version === process.env.PDF_VERSION);
 		// find the user that generated the stats
 		const statIndex = stats.findIndex((s) => s.user);
 
@@ -138,7 +138,7 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 
 		if (hasPDF) {
 			// if it does, return the pdf url
-			const fileRef = ref(storage, hasPDF.pdf);
+			const fileRef = ref(storage, hasPDF.pdf.path);
 			const url = await getDownloadURL(fileRef);
 
 			res.status(200).end(url);
@@ -305,7 +305,10 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 				// update the stats entries with the pdf url to prevent duplication
 				docsSnap.docs.forEach(async (doc) => {
 					await updateDoc(doc.ref, {
-						pdf: refName,
+						pdf: {
+							path: refName,
+							version: process.env.PDF_VERSION,
+						},
 					});
 				});
 				const url = await getDownloadURL(fileRef);
@@ -336,10 +339,10 @@ async function get(req: NextApiRequest, res: NextApiResponse) {
 
 	const stats = docsSnap.docs.map((d) => d.data());
 
-	const hasPDF = stats.find((s) => s.pdf);
+	const hasPDF = stats.find((s) => s.pdf?.path);
 
 	if (hasPDF) {
-		const fileRef = ref(storage, hasPDF.pdf);
+		const fileRef = ref(storage, hasPDF.pdf.path);
 		const url = await getDownloadURL(fileRef);
 		return res.redirect(url);
 	}