diff --git a/android/CMakeLists.txt b/android/CMakeLists.txt
index b838967..8031f2c 100644
--- a/android/CMakeLists.txt
+++ b/android/CMakeLists.txt
@@ -12,7 +12,7 @@ add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/../src" "${CMAKE_CURRENT_BINARY_DI
 # versions of CMake.
 cmake_policy(VERSION 3.14...3.25)
 
-set(PDFIUM_RELEASE chromium%2F6259)
+set(PDFIUM_RELEASE chromium%2F6406)
 set(PDFIUM_DIR ${CMAKE_BINARY_DIR}/pdfium)
 set(PDFIUM_RELEASE_DIR ${PDFIUM_DIR}/${PDFIUM_RELEASE})
 
diff --git a/darwin/pdfium/build-config.sh b/darwin/pdfium/build-config.sh
index 488b426..218a6be 100755
--- a/darwin/pdfium/build-config.sh
+++ b/darwin/pdfium/build-config.sh
@@ -5,8 +5,8 @@ if [ "$2" = "" ]; then
   exit 1
 fi
 
-# https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/6150
-LAST_KNOWN_GOOD_COMMIT=1e9d89db3c00fd1eab2959bd063832bebe6b868d
+# https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/6406
+LAST_KNOWN_GOOD_COMMIT=b756612c7933bafd2d21d8d60c2cbcc46978594c
 
 SCRIPT_DIR=$(cd $(dirname $0) && pwd)
 
diff --git a/lib/src/pdfium/pdfium_bindings.dart b/lib/src/pdfium/pdfium_bindings.dart
index 1706e82..da75ebd 100644
--- a/lib/src/pdfium/pdfium_bindings.dart
+++ b/lib/src/pdfium/pdfium_bindings.dart
@@ -2151,6 +2151,37 @@ class pdfium {
   late final _FPDFAnnot_SetURI = _FPDFAnnot_SetURIPtr.asFunction<
       int Function(FPDF_ANNOTATION, ffi.Pointer<ffi.Char>)>();
 
+  FPDF_ATTACHMENT FPDFAnnot_GetFileAttachment(
+    FPDF_ANNOTATION annot,
+  ) {
+    return _FPDFAnnot_GetFileAttachment(
+      annot,
+    );
+  }
+
+  late final _FPDFAnnot_GetFileAttachmentPtr =
+      _lookup<ffi.NativeFunction<FPDF_ATTACHMENT Function(FPDF_ANNOTATION)>>(
+          'FPDFAnnot_GetFileAttachment');
+  late final _FPDFAnnot_GetFileAttachment = _FPDFAnnot_GetFileAttachmentPtr
+      .asFunction<FPDF_ATTACHMENT Function(FPDF_ANNOTATION)>();
+
+  FPDF_ATTACHMENT FPDFAnnot_AddFileAttachment(
+    FPDF_ANNOTATION annot,
+    FPDF_WIDESTRING name,
+  ) {
+    return _FPDFAnnot_AddFileAttachment(
+      annot,
+      name,
+    );
+  }
+
+  late final _FPDFAnnot_AddFileAttachmentPtr = _lookup<
+      ffi.NativeFunction<
+          FPDF_ATTACHMENT Function(FPDF_ANNOTATION,
+              FPDF_WIDESTRING)>>('FPDFAnnot_AddFileAttachment');
+  late final _FPDFAnnot_AddFileAttachment = _FPDFAnnot_AddFileAttachmentPtr
+      .asFunction<FPDF_ATTACHMENT Function(FPDF_ANNOTATION, FPDF_WIDESTRING)>();
+
   FPDF_TEXTPAGE FPDFText_LoadPage(
     FPDF_PAGE page,
   ) {
@@ -5011,6 +5042,38 @@ class pdfium {
   late final _FPDFText_LoadStandardFont = _FPDFText_LoadStandardFontPtr
       .asFunction<FPDF_FONT Function(FPDF_DOCUMENT, FPDF_BYTESTRING)>();
 
+  FPDF_FONT FPDFText_LoadCidType2Font(
+    FPDF_DOCUMENT document,
+    ffi.Pointer<ffi.Uint8> font_data,
+    int font_data_size,
+    FPDF_BYTESTRING to_unicode_cmap,
+    ffi.Pointer<ffi.Uint8> cid_to_gid_map_data,
+    int cid_to_gid_map_data_size,
+  ) {
+    return _FPDFText_LoadCidType2Font(
+      document,
+      font_data,
+      font_data_size,
+      to_unicode_cmap,
+      cid_to_gid_map_data,
+      cid_to_gid_map_data_size,
+    );
+  }
+
+  late final _FPDFText_LoadCidType2FontPtr = _lookup<
+      ffi.NativeFunction<
+          FPDF_FONT Function(
+              FPDF_DOCUMENT,
+              ffi.Pointer<ffi.Uint8>,
+              ffi.Uint32,
+              FPDF_BYTESTRING,
+              ffi.Pointer<ffi.Uint8>,
+              ffi.Uint32)>>('FPDFText_LoadCidType2Font');
+  late final _FPDFText_LoadCidType2Font =
+      _FPDFText_LoadCidType2FontPtr.asFunction<
+          FPDF_FONT Function(FPDF_DOCUMENT, ffi.Pointer<ffi.Uint8>, int,
+              FPDF_BYTESTRING, ffi.Pointer<ffi.Uint8>, int)>();
+
   int FPDFTextObj_GetFontSize(
     FPDF_PAGEOBJECT text,
     ffi.Pointer<ffi.Float> size,
@@ -6484,6 +6547,7 @@ typedef FPDF_WIDESTRING = ffi.Pointer<FPDF_WCHAR>;
 typedef FPDF_ANNOT_APPEARANCEMODE = ffi.Int;
 typedef DartFPDF_ANNOT_APPEARANCEMODE = int;
 typedef FPDF_LINK = ffi.Pointer<fpdf_link_t__>;
+typedef FPDF_ATTACHMENT = ffi.Pointer<fpdf_attachment_t__>;
 typedef FPDF_TEXTPAGE = ffi.Pointer<fpdf_textpage_t__>;
 typedef FPDF_SCHHANDLE = ffi.Pointer<fpdf_schhandle_t__>;
 typedef FPDF_PAGELINK = ffi.Pointer<fpdf_pagelink_t__>;
diff --git a/linux/CMakeLists.txt b/linux/CMakeLists.txt
index 71acf9b..e71fa3c 100644
--- a/linux/CMakeLists.txt
+++ b/linux/CMakeLists.txt
@@ -29,7 +29,7 @@ add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/../src" "${CMAKE_CURRENT_BINARY_DI
 # versions of CMake.
 cmake_policy(VERSION 3.14...3.25)
 
-set(PDFIUM_RELEASE chromium%2F6259)
+set(PDFIUM_RELEASE chromium%2F6406)
 set(PDFIUM_DIR ${CMAKE_BINARY_DIR}/pdfium)
 set(PDFIUM_RELEASE_DIR ${PDFIUM_DIR}/${PDFIUM_RELEASE})
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 15b4bbf..b1891ad 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -51,14 +51,14 @@ ffigen:
     bindings: 'lib/src/pdfium/pdfium_bindings.dart'
   headers:
     entry-points:
-      - 'example/build/windows/x64/.lib/latest/include/fpdfview.h'
-      - 'example/build/windows/x64/.lib/latest/include/fpdf_annot.h'
-      - 'example/build/windows/x64/.lib/latest/include/fpdf_text.h'
-      - 'example/build/windows/x64/.lib/latest/include/fpdf_doc.h'
-      - 'example/build/windows/x64/.lib/latest/include/fpdf_edit.h'
-      - 'example/build/windows/x64/.lib/latest/include/fpdf_formfill.h'
+      - 'example/viewer/build/windows/x64/.lib/latest/include/fpdfview.h'
+      - 'example/viewer/build/windows/x64/.lib/latest/include/fpdf_annot.h'
+      - 'example/viewer/build/windows/x64/.lib/latest/include/fpdf_text.h'
+      - 'example/viewer/build/windows/x64/.lib/latest/include/fpdf_doc.h'
+      - 'example/viewer/build/windows/x64/.lib/latest/include/fpdf_edit.h'
+      - 'example/viewer/build/windows/x64/.lib/latest/include/fpdf_formfill.h'
     include-directives:
-      - 'example/build/windows/x64/.lib/latest/include/**'
+      - 'example/viewer/build/windows/x64/.lib/latest/include/**'
   preamble: |
     // ignore_for_file: unused_field
   name: 'pdfium'
diff --git a/windows/CMakeLists.txt b/windows/CMakeLists.txt
index a23aae9..0e71027 100644
--- a/windows/CMakeLists.txt
+++ b/windows/CMakeLists.txt
@@ -16,7 +16,7 @@ add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/../src" "${CMAKE_CURRENT_BINARY_DI
 # versions of CMake.
 cmake_policy(VERSION 3.14...3.25)
 
-set(PDFIUM_RELEASE chromium%2F6259)
+set(PDFIUM_RELEASE chromium%2F6406)
 set(PDFIUM_DIR ${CMAKE_BINARY_DIR}/pdfium)
 set(PDFIUM_RELEASE_DIR ${PDFIUM_DIR}/${PDFIUM_RELEASE})