diff --git a/DEPS b/DEPS
index b48e09beac..2da0e94f2d 100644
--- a/DEPS
+++ b/DEPS
@@ -39,7 +39,7 @@ deps = {
     Var("github") + "/google/boringssl@fc9c67599d9bdeb2e0467085133b81a8e28f77a4",
 
   "src/packager/third_party/curl/source":
-    Var("github") + "/curl/curl@c514af5a4f5ac3ce724065cc6a8e009373436f78",  #7.56.1
+    Var("github") + "/curl/curl@62c07b5743490ce373910f469abc8cdc759bec2b",  #7.57.0
 
   "src/packager/third_party/gflags/src":
     Var("chromium_git") + "/external/github.com/gflags/gflags@03bebcb065c83beff83d50ae025a55a4bf94dfca",
@@ -61,7 +61,7 @@ deps = {
     Var("chromium_git") + "/chromium/src/third_party/zlib@830b5c25b5fbe37e032ea09dd011d57042dd94df",  #408157
 
   "src/packager/tools/clang":
-    Var("chromium_git") + "/chromium/src/tools/clang@0b06ba9e49a0cba97f6accd71a974c1623d69e16",  #409802
+    Var("chromium_git") + "/chromium/src/tools/clang@723b25997f0aab45fe1776a0f74a14782e350f8f",  #513983
 
   "src/packager/tools/gyp":
     Var("chromium_git") + "/external/gyp@e7079f0e0e14108ab0dba58728ff219637458563",
@@ -109,7 +109,6 @@ hooks = [
   },
   {
     # Pull clang if needed or requested via GYP_DEFINES (GYP_DEFINES="clang=1").
-    # Note: On Win, this should run after win_toolchain, as it may use it.
     "name": "clang",
     "pattern": ".",
     "action": ["python", "src/packager/tools/clang/scripts/update.py", "--if-needed"],
diff --git a/appveyor.yml b/appveyor.yml
index f695849294..cfdf1e5826 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -21,6 +21,7 @@ install:
 before_build:
   - cd ..
   - depot_tools\gclient config https://github.com/google/shaka-packager.git --name=src --unmanaged
+  - set DEPOT_TOOLS_WIN_TOOLCHAIN=0
   - set GYP_DEFINES="target_arch=%PLATFORM% libpackager_type=%LIBPACKAGER_TYPE%"
   - depot_tools\gclient sync
   - if [%PLATFORM%] == [x64] (
diff --git a/kokoro/windows/build.bat b/kokoro/windows/build.bat
index 25e14fc4fd..7d3bcb8fba 100644
--- a/kokoro/windows/build.bat
+++ b/kokoro/windows/build.bat
@@ -18,6 +18,10 @@ python %PACKAGERDIR%\kokoro\deps_replacer.py "https://github.com" "https://githu
 
 cd %PACKAGERDIR%\..
 
+:: Disable downloading google-internal version of WIN TOOLCHAIN. Use locally
+:: installed version instead.
+set DEPOT_TOOLS_WIN_TOOLCHAIN=0
+
 :: Note that gclient file is a batch script, so 'call' must be used to wait for
 :: the result.
 :: Also gclient turns off echo, so echo is re-enabled after the command.
diff --git a/packager/common.gypi b/packager/common.gypi
index a5d37e080c..6f61d74ec5 100644
--- a/packager/common.gypi
+++ b/packager/common.gypi
@@ -27,22 +27,22 @@
           '.',
           '..',
         ],
-        'conditions': [
-          ['clang==1', {
-            'cflags': [
-              '-Wimplicit-fallthrough',
-            ],
-            # Revert the relevant settings in Chromium's common.gypi.
-            'cflags!': [
-              '-Wno-char-subscripts',
-              '-Wno-unneeded-internal-declaration',
-              '-Wno-covered-switch-default',
+        'variables': {
+          'clang_warning_flags': [
+            '-Wimplicit-fallthrough',
+          ],
+          # Revert the relevant settings in Chromium's common.gypi.
+          'clang_warning_flags_unset': [
+            '-Wno-char-subscripts',
+            '-Wno-unneeded-internal-declaration',
+            '-Wno-covered-switch-default',
 
-              # C++11-related flags:
-              '-Wno-c++11-narrowing',
-              '-Wno-reserved-user-defined-literal',
-            ],
-          }],
+            # C++11-related flags:
+            '-Wno-c++11-narrowing',
+            '-Wno-reserved-user-defined-literal',
+          ],
+        },
+        'conditions': [
           ['OS == "win"', {
             'msvs_settings': {
               'VCCLCompilerTool': {
@@ -53,9 +53,15 @@
           }],
         ],
       }, {
+        # We do not have control over non-shaka code. Disable some warnings to
+        # make build pass.
+        'variables': {
+          'clang_warning_flags': [
+            '-Wno-tautological-constant-compare',
+            '-Wno-unguarded-availability',
+          ],
+        },
         'conditions': [
-          # We do not have control over non-shaka code. Disable some warnings to
-          # make build pass.
           ['clang==0', {
             'cflags': [
               '-Wno-dangling-else',
diff --git a/packager/media/formats/webvtt/webvtt_to_mp4_handler.cc b/packager/media/formats/webvtt/webvtt_to_mp4_handler.cc
index 5366e7bd10..450feaf934 100644
--- a/packager/media/formats/webvtt/webvtt_to_mp4_handler.cc
+++ b/packager/media/formats/webvtt/webvtt_to_mp4_handler.cc
@@ -18,6 +18,8 @@ namespace media {
 class DisplayAction {
  public:
   DisplayAction(uint64_t id, uint64_t time) : id_(id), time_(time) {}
+  virtual ~DisplayAction() = default;
+
   uint64_t id() const { return id_; }
   uint64_t time() const { return time_; }
   virtual void ActOn(std::list<const TextSample*>* display) const = 0;
diff --git a/packager/mpd/base/period.h b/packager/mpd/base/period.h
index 6634267978..340460a53d 100644
--- a/packager/mpd/base/period.h
+++ b/packager/mpd/base/period.h
@@ -29,6 +29,8 @@ class XmlNode;
 /// AdaptationSets.
 class Period {
  public:
+  virtual ~Period() = default;
+
   /// Check the existing AdaptationSets, if there is one matching the provided
   /// @a media_info, return it; otherwise a new AdaptationSet is created and
   /// returned.
diff --git a/packager/third_party/curl/curl.gyp b/packager/third_party/curl/curl.gyp
index 1843982a13..27afa68dfb 100644
--- a/packager/third_party/curl/curl.gyp
+++ b/packager/third_party/curl/curl.gyp
@@ -162,12 +162,12 @@
         'source/lib/hmac.c',
         'source/lib/hostasyn.c',
         'source/lib/hostcheck.c',
+        'source/lib/hostip.c',
         'source/lib/hostip4.c',
         'source/lib/hostip6.c',
-        'source/lib/hostip.c',
         'source/lib/hostsyn.c',
-        'source/lib/http2.c',
         'source/lib/http.c',
+        'source/lib/http2.c',
         'source/lib/http_chunks.c',
         'source/lib/http_digest.c',
         'source/lib/http_negotiate.c',
@@ -203,6 +203,8 @@
         'source/lib/security.c',
         'source/lib/select.c',
         'source/lib/sendf.c',
+        'source/lib/setopt.c',
+        'source/lib/sha256.c',
         'source/lib/share.c',
         'source/lib/slist.c',
         'source/lib/smb.c',
diff --git a/packager/third_party/libxml/libxml.gyp b/packager/third_party/libxml/libxml.gyp
index 54790f6cec..fcc049756f 100644
--- a/packager/third_party/libxml/libxml.gyp
+++ b/packager/third_party/libxml/libxml.gyp
@@ -220,6 +220,8 @@
               # trio_is_special_quantity and trio_is_negative are only
               # used with certain preprocessor defines set.
               '-Wno-unused-function',
+              # Comparison between xmlElementType and xmlXPathTypeVal.
+              '-Wno-enum-compare',
             ],
           },
           'include_dirs': [
diff --git a/packager/third_party/protobuf/protobuf.gyp b/packager/third_party/protobuf/protobuf.gyp
index e985836507..118baa58f9 100644
--- a/packager/third_party/protobuf/protobuf.gyp
+++ b/packager/third_party/protobuf/protobuf.gyp
@@ -46,6 +46,8 @@
             'clang_warning_flags': [
               # protobuf-3 contains a few functions that are unused.
               '-Wno-unused-function',
+              '-Wno-enum-compare',
+              '-Wno-user-defined-warnings',
             ],
           },
           # Required for component builds. See http://crbug.com/172800.
@@ -75,6 +77,8 @@
             'clang_warning_flags': [
               # protobuf-3 contains a few functions that are unused.
               '-Wno-unused-function',
+              '-Wno-enum-compare',
+              '-Wno-user-defined-warnings',
             ],
           },
           'sources': [
@@ -399,6 +403,8 @@
             'clang_warning_flags': [
               # protobuf-3 contains a few functions that are unused.
               '-Wno-unused-function',
+              '-Wno-enum-compare',
+              '-Wno-user-defined-warnings',
             ],
           },
           'dependencies': [