diff --git a/build.gradle b/build.gradle
index ac9a73d0e..9844b4b74 100644
--- a/build.gradle
+++ b/build.gradle
@@ -178,7 +178,7 @@ dependencies {
     implementation group: "org.apache.commons", name: "commons-lang3", version: "3.17.0"
     implementation group: "commons-validator", name: "commons-validator", version: "1.9.0"
 
-    implementation group: 'org.apache.pdfbox', name: 'pdfbox', version: "3.0.2"
+    implementation group: 'org.apache.pdfbox', name: 'pdfbox', version: "3.0.3"
     implementation group: "net.javacrumbs.shedlock", name: "shedlock-spring", version: versions.shedlock
     implementation group: "net.javacrumbs.shedlock", name: "shedlock-provider-jdbc-template", version: versions.shedlock
     implementation group: 'org.apache.poi', name: 'poi-ooxml', version: '5.3.0', withoutCVE202011987
diff --git a/src/main/java/uk/gov/hmcts/reform/em/stitching/pdf/PDFOutline.java b/src/main/java/uk/gov/hmcts/reform/em/stitching/pdf/PDFOutline.java
index 686566241..724e64752 100644
--- a/src/main/java/uk/gov/hmcts/reform/em/stitching/pdf/PDFOutline.java
+++ b/src/main/java/uk/gov/hmcts/reform/em/stitching/pdf/PDFOutline.java
@@ -139,6 +139,7 @@ public void copyOutline(
             PDDocumentCatalog documentCatalog,
             String key, int currentPageNumber)
             throws IOException {
+        cosObjectKeys.clear();
         PDOutlineItem destLastOutlineItem;
         var node =
             outlineTree.findTreeNode(createBundleItemComparable(key), outlineTree);