diff --git a/docker/android/Dockerfile b/docker/android/Dockerfile
index ba14d23..f619e72 100644
--- a/docker/android/Dockerfile
+++ b/docker/android/Dockerfile
@@ -54,7 +54,7 @@ WORKDIR /build
 RUN gclient config --unmanaged https://pdfium.googlesource.com/pdfium.git
 RUN gclient sync
 WORKDIR /build/pdfium
-RUN git checkout affa0ec49277441f4f42efcf8d0894d82e2d4604
+RUN git checkout 31722577db9dc12a249ca6cdf2ff34e51a998360
 
 RUN ln -s /usr/bin/python3 /usr/bin/python
 RUN ln -s /usr/bin/pip3 /usr/bin/pip
diff --git a/docker/wasm/Dockerfile b/docker/wasm/Dockerfile
index 9a30ea3..01518b4 100644
--- a/docker/wasm/Dockerfile
+++ b/docker/wasm/Dockerfile
@@ -33,7 +33,7 @@ WORKDIR /build
 RUN gclient config --unmanaged https://pdfium.googlesource.com/pdfium.git
 RUN gclient sync
 WORKDIR /build/pdfium
-RUN git checkout c2ff7477dae94b94de39d11b7bde23169ea8a306
+RUN git checkout 31722577db9dc12a249ca6cdf2ff34e51a998360
 
 RUN ln -s /usr/bin/python3 /usr/bin/python
 RUN ln -s /usr/bin/pip3 /usr/bin/pip
diff --git a/docs/BUILD_ANDROID.md b/docs/BUILD_ANDROID.md
index 5c302d9..6bb35f1 100644
--- a/docs/BUILD_ANDROID.md
+++ b/docs/BUILD_ANDROID.md
@@ -2,15 +2,15 @@
 
 1. Execute all **general** steps
 
-2. PDFium android dependencies
-```./build/android/pdfium/build/install-build-deps-android.sh```
-
-3. Get PDFium:  
+2. Get PDFium:  
 ```python3 make.py run build-pdfium-android```  
 
-4. Patch:  
+3. Patch:  
 ```python3 make.py run patch-android```  
 
+4. PDFium Android dependencies
+```./build/android/pdfium/build/install-build-deps-android.sh```
+
 5. Compile:  
 ```python3 make.py run build-android```  
   
diff --git a/docs/BUILD_WASM.md b/docs/BUILD_WASM.md
index 59bf77a..9e0f942 100644
--- a/docs/BUILD_WASM.md
+++ b/docs/BUILD_WASM.md
@@ -2,18 +2,18 @@
 
 1. Execute all **general** steps
 
-2. PDFium linux dependencies
-```./build/linux/pdfium/build/install-build-deps.sh```
-
-3. Get Emscripten SDK:  
+2. Get Emscripten SDK:  
 ```python3 make.py run build-emsdk```  
 
-4. Get PDFium:  
+3. Get PDFium:  
 ```python3 make.py run build-pdfium-wasm```  
 
-5. Patch:  
+4. Patch:  
 ```python3 make.py run patch-wasm```  
 
+5. PDFium Linux dependencies
+```./build/linux/pdfium/build/install-build-deps.sh```
+
 6. Compile:  
 ```python3 make.py run build-wasm```  
   
diff --git a/extras/wasm/template/index.html b/extras/wasm/template/index.html
index 8f23683..1b3cd0c 100644
--- a/extras/wasm/template/index.html
+++ b/extras/wasm/template/index.html
@@ -14,7 +14,7 @@
 
     <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.2/css/bulma.min.css">
 
-    <script src="pdfium.js?v=4637"></script>
+    <script src="pdfium.js?v={pdfium-branch}"></script>
 
     <script>
         // variables
@@ -1032,7 +1032,7 @@ <h1 id="fileTitle" class="title" style="display: none;">PDF Viewer</h1>
                 everything run only on client side.
             </p>
             <p>
-                PDFium branch "4637" and commit "affa0ec49277441f4f42efcf8d0894d82e2d4604".
+                PDFium branch "{pdfium-branch}" and commit "{pdfium-commit}".
             </p>
         </div>
     </footer>
diff --git a/modules/android.py b/modules/android.py
index f708236..5364ab2 100644
--- a/modules/android.py
+++ b/modules/android.py
@@ -50,8 +50,8 @@ def run_task_patch():
         source_dir,
         "BUILD.gn",
     )
-    if f.file_line_has_content(source_file, 25, "  ]\n"):
-        f.replace_line_in_file(source_file, 25, '    "FPDFSDK_EXPORTS",\n  ]\n')
+    if f.file_line_has_content(source_file, 26, "  ]\n"):
+        f.replace_line_in_file(source_file, 26, '    "FPDFSDK_EXPORTS",\n  ]\n')
 
         f.debug("Applied: Build GN")
     else:
@@ -71,8 +71,6 @@ def run_task_patch():
     else:
         f.debug("Skipped: Build GN Flags")
 
-    pass
-
 
 def run_task_build():
     f.debug("Building libraries...")
diff --git a/modules/config.py b/modules/config.py
index 12c2bfb..4188d23 100644
--- a/modules/config.py
+++ b/modules/config.py
@@ -5,9 +5,9 @@
 targets = ["ios", "macos", "android"]
 
 # pdfium
-pdfium_git_branch = "4637"
-pdfium_git_commit = "affa0ec49277441f4f42efcf8d0894d82e2d4604"
-# ^ ref: https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4637
+pdfium_git_branch = "4692"
+pdfium_git_commit = "31722577db9dc12a249ca6cdf2ff34e51a998360"
+# ^ ref: https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4692
 # OBS 1: don't forget change in android docker file (docker/android/Dockerfile)
 # OBS 2: don't forget change in wasm docker file (docker/wasm/Dockerfile)
 
diff --git a/modules/ios.py b/modules/ios.py
index f0a60a4..e87deb2 100644
--- a/modules/ios.py
+++ b/modules/ios.py
@@ -47,13 +47,12 @@ def run_task_patch():
         source_dir,
         "BUILD.gn",
     )
-    if not f.file_line_has_content(source_file, 247, '#test("pdfium_unittests") {\n'):
-        f.file_line_comment_range(
-            source_file, 247, 294
-        )  # comment all lines of "pdfium_unittests"
-        f.file_line_comment_range(
-            source_file, 385, 386
-        )  # group "pdfium_all", comment all tests
+    if not f.file_line_has_content(source_file, 408, '#test("pdfium_unittests") {\n'):
+        # comment all lines of "pdfium_unittests"
+        f.file_line_comment_range(source_file, 408, 455)
+
+        # group "pdfium_all", comment all tests (pdfium_embeddertests and pdfium_unittests)
+        f.file_line_comment_range(source_file, 546, 547)
 
         f.debug("Applied: Build GN")
     else:
@@ -65,9 +64,9 @@ def run_task_patch():
         "BUILD.gn",
     )
     if f.file_line_has_content(
-        source_file, 56, '    cflags += [ "-Wdeprecated-copy" ]\n'
+        source_file, 217, '    cflags += [ "-Wdeprecated-copy" ]\n'
     ):
-        f.file_line_comment(source_file, 56)
+        f.file_line_comment(source_file, 217)
 
         f.debug("Applied: Deprecated Warning")
     else:
@@ -116,8 +115,8 @@ def run_task_patch():
         "compiler",
         "BUILD.gn",
     )
-    if f.file_line_has_content(source_file, 1707, '      "-Wimplicit-fallthrough",\n'):
-        f.file_line_comment(source_file, 1707)
+    if f.file_line_has_content(source_file, 1611, '      "-Wimplicit-fallthrough",\n'):
+        f.file_line_comment(source_file, 1611)
 
         f.debug("Applied: Compiler")
     else:
@@ -174,9 +173,9 @@ def run_task_patch():
         "rules.gni",
     )
     if not f.file_line_has_content(
-        source_file, 954, '#          data_deps += [ "//testing/iossim" ]\n'
+        source_file, 964, '#          data_deps += [ "//testing/iossim" ]\n'
     ):
-        f.file_line_comment(source_file, 954)
+        f.file_line_comment(source_file, 964)
 
         f.debug("Applied: iOS Simulator")
     else:
@@ -240,11 +239,11 @@ def run_task_patch():
         "BUILD.gn",
     )
     if f.file_line_has_content(
-        source_file, 1237, '      cflags += [ "-ffile-compilation-dir=." ]\n'
+        source_file, 1262, '      cflags += [ "-ffile-compilation-dir=." ]\n'
     ):
         f.replace_line_in_file(
             source_file,
-            1237,
+            1262,
             '      cflags += ["-Xclang","-fdebug-compilation-dir","-Xclang","."]\n',
         )
 
diff --git a/modules/macos.py b/modules/macos.py
index 63cabf5..7b99aa6 100644
--- a/modules/macos.py
+++ b/modules/macos.py
@@ -51,12 +51,12 @@ def run_task_patch():
     )
     if not f.file_line_has_content(
         source_file,
-        55,
+        57,
         'use_arm_neon_optimizations = (current_cpu == "arm" || current_cpu == "arm64")\n',
     ):
         f.replace_line_in_file(
             source_file,
-            55,
+            57,
             'use_arm_neon_optimizations = (current_cpu == "arm" || current_cpu == "arm64")\n\n',
         )
 
diff --git a/modules/wasm.py b/modules/wasm.py
index f50a11e..3399a0b 100644
--- a/modules/wasm.py
+++ b/modules/wasm.py
@@ -92,12 +92,12 @@ def run_task_patch():
     )
     if f.file_line_has_content(
         source_file,
-        219,
+        380,
         '    configs -= [ "//build/config/compiler:thin_archive" ]\n',
     ):
         f.replace_line_in_file(
             source_file,
-            219,
+            380,
             '    #configs -= [ "//build/config/compiler:thin_archive" ]\n',
         )
 
@@ -115,22 +115,22 @@ def run_task_patch():
     )
     if f.file_line_has_content(
         source_file,
-        853,
+        878,
         '        "-m64",\n',
     ):
         f.replace_line_in_file(
             source_file,
-            853,
+            878,
             '        #"-m64",\n',
         )
         f.replace_line_in_file(
             source_file,
-            854,
+            879,
             '        #"-march=$x64_arch",\n',
         )
         f.replace_line_in_file(
             source_file,
-            855,
+            880,
             '        #"-msse3",\n',
         )
 
@@ -148,12 +148,12 @@ def run_task_patch():
     )
     if f.file_line_has_content(
         source_file,
-        1626,
+        1520,
         '          "-Wno-ignored-pragma-optimize",\n',
     ):
         f.replace_line_in_file(
             source_file,
-            1626,
+            1520,
             '          "-Wno-deprecated-register",\n',
         )
 
@@ -171,12 +171,12 @@ def run_task_patch():
     )
     if f.file_line_has_content(
         source_file,
-        2406,
+        2308,
         '        cflags += [ "-ggnu-pubnames" ]\n',
     ):
         f.replace_line_in_file(
             source_file,
-            2406,
+            2308,
             '        #cflags += [ "-ggnu-pubnames" ]\n',
         )
 
@@ -193,17 +193,17 @@ def run_task_patch():
     )
     if f.file_line_has_content(
         source_file,
-        677,
+        740,
         '    cc = "$prefix/clang"\n',
     ):
         f.replace_line_in_file(
             source_file,
-            677,
+            740,
             '    cc = "emcc"\n',
         )
         f.replace_line_in_file(
             source_file,
-            678,
+            741,
             '    cxx = "em++"\n',
         )
 
@@ -245,18 +245,18 @@ def run_task_patch():
     )
     if f.file_line_has_content(
         source_file,
-        333,
+        335,
         '        cflags += [ "-fstack-protector" ]\n',
     ):
         f.replace_line_in_file(
             source_file,
-            333,
+            335,
             '        cflags += [ "-fno-stack-protector" ]\n',
         )
 
         f.replace_line_in_file(
             source_file,
-            345,
+            347,
             '        cflags += [ "-fno-stack-protector" ]\n',
         )
 
@@ -296,12 +296,12 @@ def run_task_patch():
     )
     if f.file_line_has_content(
         source_file,
-        494,
+        497,
         '    cflags += [ "-pthread" ]\n',
     ):
         f.replace_line_in_file(
             source_file,
-            494,
+            497,
             '    #cflags += [ "-pthread" ]\n',
         )
 
@@ -333,6 +333,29 @@ def run_task_patch():
     else:
         f.debug("Skipped: skia pthread")
 
+    # compiler bitwise
+    source_file = os.path.join(
+        source_dir,
+        "build",
+        "config",
+        "compiler",
+        "BUILD.gn",
+    )
+    if f.file_line_has_content(
+        source_file,
+        1534,
+        '            "-Wno-bitwise-instead-of-logical",\n',
+    ):
+        f.replace_line_in_file(
+            source_file,
+            1534,
+            '            #"-Wno-bitwise-instead-of-logical",\n',
+        )
+
+        f.debug("Applied: compiler bitwise")
+    else:
+        f.debug("Skipped: compiler bitwise")
+
     # copy files required
     f.debug("Copying required files...")
 
@@ -519,10 +542,16 @@ def run_task_test():
     current_dir = os.getcwd()
     sample_dir = os.path.join(current_dir, "sample-wasm")
     build_dir = os.path.join(sample_dir, "build")
-    http_dir = os.path.join("sample-wasm", "build")
+    http_dir = os.path.join(sample_dir, "build")
 
     for config in c.configurations_wasm:
         for target in c.targets_wasm:
+            f.debug(
+                'Generating test files to arch "{0}" and configuration "{1}"...'.format(
+                    target["target_cpu"], config
+                )
+            )
+
             lib_file_out = os.path.join(
                 current_dir,
                 "build",
diff --git a/sample-wasm/src/main.cpp b/sample-wasm/src/main.cpp
index 6612f6b..3435e67 100644
--- a/sample-wasm/src/main.cpp
+++ b/sample-wasm/src/main.cpp
@@ -4,6 +4,8 @@
 
 int main(int argc, char **argv)
 {
+    // sample: https://github.com/lukas-w/pdfium/blob/master/docs/getting-started.md
+
     std::cout << "Starting..." << std::endl;
 
     FPDF_LIBRARY_CONFIG config;
diff --git a/sample/src/main.cpp b/sample/src/main.cpp
index d23fb6c..f5d1861 100644
--- a/sample/src/main.cpp
+++ b/sample/src/main.cpp
@@ -5,6 +5,8 @@
 
 int main(int argc, char **argv)
 {
+    // sample: https://github.com/lukas-w/pdfium/blob/master/docs/getting-started.md
+
     std::cout << "Starting..." << std::endl;
 
     FPDF_LIBRARY_CONFIG config;