diff --git a/.gitignore b/.gitignore
index 4ade8f822..89b16baf4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -80,4 +80,5 @@ fastlane/test_output
 bundled/translators
 bundled/styles
 bundled/locales
-bundled/note_editor
\ No newline at end of file
+bundled/note_editor
+fonts
diff --git a/Zotero.xcodeproj/project.pbxproj b/Zotero.xcodeproj/project.pbxproj
index 79f52169b..c75f9ad4e 100644
--- a/Zotero.xcodeproj/project.pbxproj
+++ b/Zotero.xcodeproj/project.pbxproj
@@ -39,6 +39,7 @@
 		618404262A4456A9005AAF22 /* IdentifierLookupController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 618404252A4456A9005AAF22 /* IdentifierLookupController.swift */; };
 		618D83E72BAAC88C00E7966B /* PrivacyInfo.xcprivacy in Resources */ = {isa = PBXBuildFile; fileRef = 618D83E62BAAC88C00E7966B /* PrivacyInfo.xcprivacy */; };
 		618D83E82BAAC88C00E7966B /* PrivacyInfo.xcprivacy in Resources */ = {isa = PBXBuildFile; fileRef = 618D83E62BAAC88C00E7966B /* PrivacyInfo.xcprivacy */; };
+		61975C422D38E6E8005BB41A /* fonts in Resources */ = {isa = PBXBuildFile; fileRef = 61975C412D38E6E8005BB41A /* fonts */; };
 		61A0C8472B8F669C0048FF92 /* PSPDFKitUI+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 61A0C8462B8F669B0048FF92 /* PSPDFKitUI+Extensions.swift */; };
 		61ABA7512A6137D1002A4219 /* ShareableImage.swift in Sources */ = {isa = PBXBuildFile; fileRef = 61ABA7502A6137D1002A4219 /* ShareableImage.swift */; };
 		61BD13952A5831EF008A0704 /* TextKit1TextView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 61BD13942A5831EF008A0704 /* TextKit1TextView.swift */; };
@@ -1307,6 +1308,7 @@
 		61639F842AE03B8500026003 /* InstantPresenter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InstantPresenter.swift; sourceTree = "<group>"; };
 		618404252A4456A9005AAF22 /* IdentifierLookupController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = IdentifierLookupController.swift; sourceTree = "<group>"; };
 		618D83E62BAAC88C00E7966B /* PrivacyInfo.xcprivacy */ = {isa = PBXFileReference; lastKnownFileType = text.xml; path = PrivacyInfo.xcprivacy; sourceTree = "<group>"; };
+		61975C412D38E6E8005BB41A /* fonts */ = {isa = PBXFileReference; lastKnownFileType = folder; path = fonts; sourceTree = "<group>"; };
 		61A0C8462B8F669B0048FF92 /* PSPDFKitUI+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "PSPDFKitUI+Extensions.swift"; sourceTree = "<group>"; };
 		61ABA7502A6137D1002A4219 /* ShareableImage.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareableImage.swift; sourceTree = "<group>"; };
 		61BD13942A5831EF008A0704 /* TextKit1TextView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TextKit1TextView.swift; sourceTree = "<group>"; };
@@ -2843,6 +2845,7 @@
 			isa = PBXGroup;
 			children = (
 				B3F6415E2A28B1EF00A78CB0 /* ci_scripts */,
+				61975C412D38E6E8005BB41A /* fonts */,
 				B30BA8C3255D415600361D25 /* Bundled */,
 				B32A495A2A44730C00080945 /* licenses */,
 				B30D59572206F60400884C4A /* Zotero */,
@@ -4511,6 +4514,7 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				61975C422D38E6E8005BB41A /* fonts in Resources */,
 				B3593F33241A61C700760E20 /* ItemDetailNoteContentView.xib in Resources */,
 				618D83E72BAAC88C00E7966B /* PrivacyInfo.xcprivacy in Resources */,
 				B32A273D254841B80081E061 /* CreatorEditViewController.xib in Resources */,
diff --git a/Zotero/AppDelegate.swift b/Zotero/AppDelegate.swift
index 63d22002a..947dc9399 100644
--- a/Zotero/AppDelegate.swift
+++ b/Zotero/AppDelegate.swift
@@ -210,7 +210,15 @@ extension AppDelegate: SceneActivityCounter {
 extension AppDelegate: UIApplicationDelegate {
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         if let key = Licenses.shared.pspdfkitKey {
-            PSPDFKit.SDK.setLicenseKey(key)
+            let additionalFontDirectory = Bundle.main.bundleURL.appendingPathComponent("fonts", isDirectory: true).path
+            let options: [SDK.Setting: Any] = [.additionalFontDirectories: [additionalFontDirectory]]
+            PSPDFKit.SDK.setLicenseKey(key, options: options)
+        }
+        DDLogInfo("AppDelegate: clearPSPDFKitCacheGuard: \(Defaults.shared.clearPSPDFKitCacheGuard); currentClearPSPDFKitCacheGuard: \(Defaults.currentClearPSPDFKitCacheGuard)")
+        if Defaults.shared.clearPSPDFKitCacheGuard < Defaults.currentClearPSPDFKitCacheGuard {
+            PSPDFKit.SDK.shared.cache.clear()
+            DDLogInfo("AppDelegate: did clear PSPDFKit cache")
+            Defaults.shared.clearPSPDFKitCacheGuard = Defaults.currentClearPSPDFKitCacheGuard
         }
         PSPDFKit.SDK.shared.styleManager.setLastUsedValue(AnnotationsConfig.imageAnnotationLineWidth,
                                                           forProperty: "lineWidth",
diff --git a/Zotero/Models/Defaults.swift b/Zotero/Models/Defaults.swift
index ce1f74f14..2154f93de 100644
--- a/Zotero/Models/Defaults.swift
+++ b/Zotero/Models/Defaults.swift
@@ -175,6 +175,11 @@ final class Defaults {
     @UserDefault(key: "DidPerformFullSyncFix", defaultValue: true)
     var didPerformFullSyncFix: Bool
 
+    // Increment currentClearPSPDFKitCacheGuard by 1, whenever the upcoming release should clear the PSPDFKit cache.
+    static let currentClearPSPDFKitCacheGuard = 1
+    @UserDefault(key: "ClearPSPDFKitCacheGuard", defaultValue: currentClearPSPDFKitCacheGuard - 1)
+    var clearPSPDFKitCacheGuard: Int
+
     // MARK: - Actions
 
     func reset() {
diff --git a/ci_scripts/ci_post_clone.sh b/ci_scripts/ci_post_clone.sh
index 3c1abe78c..2656d7d1f 100755
--- a/ci_scripts/ci_post_clone.sh
+++ b/ci_scripts/ci_post_clone.sh
@@ -8,6 +8,22 @@
 
 set -euo pipefail
 
+# Download missing fonts (remove if fixed in PSPDFKit)
+font_url="https://raw.githubusercontent.com/notofonts/noto-cjk/refs/heads/main/google-fonts/NotoSansSC%5Bwght%5D.ttf"
+output_directory="../fonts"
+mkdir -p $output_directory
+output_filename="NotoSansSC[wght].ttf"
+output_path="$output_directory/$output_filename"
+curl -fL -o "$output_path" $font_url || { echo "Font download failed"; exit 1; }
+echo "Verifying downloaded font file..."
+if file "$output_path" | grep -q "TrueType Font data"; then
+    echo "Font file verification passed: $output_path is a TTF file."
+else
+    echo "Font file verification failed: $output_path is not a TTF file."
+    rm -f "$output_path"
+    exit 1
+fi
+
 which swiftgen || HOMEBREW_NO_AUTO_UPDATE=1 HOMEBREW_NO_INSTALL_CLEANUP=1 brew install swiftgen
 which swiftlint || HOMEBREW_NO_AUTO_UPDATE=1 HOMEBREW_NO_INSTALL_CLEANUP=1 brew install swiftlint
 which openssl || HOMEBREW_NO_AUTO_UPDATE=1 HOMEBREW_NO_INSTALL_CLEANUP=1 brew install openssl