diff --git a/bower.json b/bower.json
index a354fa56c..170eb9e6d 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.4.129",
+  "version": "1.4.131",
   "main": [
     "build/pdf.js",
     "build/pdf.worker.js"
diff --git a/build/pdf.combined.js b/build/pdf.combined.js
index 9996a140e..16d02d1aa 100644
--- a/build/pdf.combined.js
+++ b/build/pdf.combined.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdfCombined = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.4.129';
-var pdfjsBuild = '4065a21';
+var pdfjsVersion = '1.4.131';
+var pdfjsBuild = '1475984';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
@@ -34464,6 +34464,11 @@ var Font = (function FontClosure() {
   function int16(b0, b1) {
     return (b0 << 8) + b1;
   }
+ 
+  function signedInt16(b0, b1) {
+    var value = (b0 << 8) + b1;
+    return value & (1 << 15) ? value - 0x10000 : value;
+  }
 
   function int32(b0, b1, b2, b3) {
     return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
@@ -35982,9 +35987,9 @@ var Font = (function FontClosure() {
       var metricsOverride = {
         unitsPerEm: int16(tables['head'].data[18], tables['head'].data[19]),
         yMax: int16(tables['head'].data[42], tables['head'].data[43]),
-        yMin: int16(tables['head'].data[38], tables['head'].data[39]) - 0x10000,
+        yMin: signedInt16(tables['head'].data[38], tables['head'].data[39]),
         ascent: int16(tables['hhea'].data[4], tables['hhea'].data[5]),
-        descent: int16(tables['hhea'].data[6], tables['hhea'].data[7]) - 0x10000
+        descent: signedInt16(tables['hhea'].data[6], tables['hhea'].data[7])
       };
 
       // PDF FontDescriptor metrics lie -- using data from actual font.
diff --git a/build/pdf.js b/build/pdf.js
index cfb750c4b..f0278fa2e 100644
--- a/build/pdf.js
+++ b/build/pdf.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdf = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.4.129';
-var pdfjsBuild = '4065a21';
+var pdfjsVersion = '1.4.131';
+var pdfjsBuild = '1475984';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
diff --git a/build/pdf.worker.js b/build/pdf.worker.js
index 98385cdd2..5a1f01982 100644
--- a/build/pdf.worker.js
+++ b/build/pdf.worker.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdfWorker = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.4.129';
-var pdfjsBuild = '4065a21';
+var pdfjsVersion = '1.4.131';
+var pdfjsBuild = '1475984';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
@@ -26484,6 +26484,11 @@ var Font = (function FontClosure() {
   function int16(b0, b1) {
     return (b0 << 8) + b1;
   }
+ 
+  function signedInt16(b0, b1) {
+    var value = (b0 << 8) + b1;
+    return value & (1 << 15) ? value - 0x10000 : value;
+  }
 
   function int32(b0, b1, b2, b3) {
     return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
@@ -28002,9 +28007,9 @@ var Font = (function FontClosure() {
       var metricsOverride = {
         unitsPerEm: int16(tables['head'].data[18], tables['head'].data[19]),
         yMax: int16(tables['head'].data[42], tables['head'].data[43]),
-        yMin: int16(tables['head'].data[38], tables['head'].data[39]) - 0x10000,
+        yMin: signedInt16(tables['head'].data[38], tables['head'].data[39]),
         ascent: int16(tables['hhea'].data[4], tables['hhea'].data[5]),
-        descent: int16(tables['hhea'].data[6], tables['hhea'].data[7]) - 0x10000
+        descent: signedInt16(tables['hhea'].data[6], tables['hhea'].data[7])
       };
 
       // PDF FontDescriptor metrics lie -- using data from actual font.
diff --git a/package.json b/package.json
index b46564e8a..6ce9b6271 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.4.129",
+  "version": "1.4.131",
   "main": "build/pdf.js",
   "description": "Generic build of Mozilla's PDF.js library.",
   "keywords": [