diff --git a/third_party/libwebm/AUTHORS.TXT b/third_party/libwebm/AUTHORS.TXT
index 9686ac1..59b648c 100644
--- a/third_party/libwebm/AUTHORS.TXT
+++ b/third_party/libwebm/AUTHORS.TXT
@@ -2,3 +2,4 @@
 # Name or Organization <email address>
 
 Google Inc.
+Elijah Cirioli <eli.cirioli@gmail.com>
diff --git a/third_party/libwebm/Android.mk b/third_party/libwebm/Android.mk
index 1185198..e6c17df 100644
--- a/third_party/libwebm/Android.mk
+++ b/third_party/libwebm/Android.mk
@@ -1,3 +1,5 @@
+# Ignore this file during non-NDK builds.
+ifdef NDK_ROOT
 LOCAL_PATH:= $(call my-dir)
 
 include $(CLEAR_VARS)
@@ -18,3 +20,4 @@
 LOCAL_LICENSE_CONDITIONS := notice
 LOCAL_NOTICE_FILE := $(LOCAL_PATH)/LICENSE.TXT $(LOCAL_PATH)/PATENTS.TXT
 include $(BUILD_STATIC_LIBRARY)
+endif  # NDK_ROOT
diff --git a/third_party/libwebm/README.libaom b/third_party/libwebm/README.libaom
index 325604c..ee350a5 100644
--- a/third_party/libwebm/README.libaom
+++ b/third_party/libwebm/README.libaom
@@ -1,7 +1,7 @@
 URL: https://chromium.googlesource.com/webm/libwebm
-Version: ee0bab576c338c9807249b99588e352b7268cb62
+Version: 1930e3ca23b007f3ff11d98a570077be6201957e
 License: BSD
-License File: LICENSE.txt
+License File: LICENSE.TXT
 
 Description:
 libwebm is used to handle WebM container I/O.
diff --git a/third_party/libwebm/mkvmuxer/mkvmuxer.cc b/third_party/libwebm/mkvmuxer/mkvmuxer.cc
index ae36531..faaf016 100644
--- a/third_party/libwebm/mkvmuxer/mkvmuxer.cc
+++ b/third_party/libwebm/mkvmuxer/mkvmuxer.cc
@@ -607,10 +607,10 @@
   return true;
 }
 
-uint64_t ContentEncoding::EncodingSize(uint64_t compresion_size,
+uint64_t ContentEncoding::EncodingSize(uint64_t compression_size,
                                        uint64_t encryption_size) const {
   // TODO(fgalligan): Add support for compression settings.
-  if (compresion_size != 0)
+  if (compression_size != 0)
     return 0;
 
   uint64_t encoding_size = 0;
diff --git a/third_party/libwebm/mkvmuxer/mkvmuxer.h b/third_party/libwebm/mkvmuxer/mkvmuxer.h
index f2db377..8602d82 100644
--- a/third_party/libwebm/mkvmuxer/mkvmuxer.h
+++ b/third_party/libwebm/mkvmuxer/mkvmuxer.h
@@ -330,7 +330,7 @@
 
  private:
   // Returns the size in bytes for the encoding elements.
-  uint64_t EncodingSize(uint64_t compresion_size,
+  uint64_t EncodingSize(uint64_t compression_size,
                         uint64_t encryption_size) const;
 
   // Returns the size in bytes for the encryption elements.
@@ -1425,7 +1425,7 @@
   bool Write(IMkvWriter* writer);
 
   // We are going to put a cap on the number of Seek Entries.
-  const static int32_t kSeekEntryCount = 5;
+  constexpr static int32_t kSeekEntryCount = 5;
 
  private:
   // Returns the maximum size in bytes of one seek entry.
@@ -1505,8 +1505,8 @@
     kBeforeClusters = 0x1  // Position Cues before Clusters
   };
 
-  static const uint32_t kDefaultDocTypeVersion = 4;
-  static const uint64_t kDefaultMaxClusterDuration = 30000000000ULL;
+  static constexpr uint32_t kDefaultDocTypeVersion = 4;
+  static constexpr uint64_t kDefaultMaxClusterDuration = 30000000000ULL;
 
   Segment();
   ~Segment();
diff --git a/third_party/libwebm/mkvmuxer/mkvmuxerutil.cc b/third_party/libwebm/mkvmuxer/mkvmuxerutil.cc
index bd2f769..300b155 100644
--- a/third_party/libwebm/mkvmuxer/mkvmuxerutil.cc
+++ b/third_party/libwebm/mkvmuxer/mkvmuxerutil.cc
@@ -607,7 +607,7 @@
 void GetVersion(int32* major, int32* minor, int32* build, int32* revision) {
   *major = 0;
   *minor = 3;
-  *build = 0;
+  *build = 1;
   *revision = 0;
 }
 
diff --git a/third_party/libwebm/mkvparser/mkvparser.cc b/third_party/libwebm/mkvparser/mkvparser.cc
index de8884b..868afcb 100644
--- a/third_party/libwebm/mkvparser/mkvparser.cc
+++ b/third_party/libwebm/mkvparser/mkvparser.cc
@@ -55,7 +55,7 @@
 void GetVersion(int& major, int& minor, int& build, int& revision) {
   major = 1;
   minor = 1;
-  build = 0;
+  build = 1;
   revision = 0;
 }
 
@@ -298,7 +298,7 @@
   if (status < 0)
     return status;
 
-  unsigned long long result = first_byte;
+  unsigned long long result = static_cast<unsigned long long>(first_byte);
   ++pos;
 
   for (long i = 1; i < size; ++i) {
@@ -2432,7 +2432,7 @@
     pos += size;  // consume payload
   }
 
-  if ((m_pos < 0) || (m_track <= 0)) {
+  if ((m_pos < 0) || (m_track <= 0) || (m_block < 0) || (m_block > LONG_MAX)) {
     return false;
   }