diff --git a/package.json b/package.json
index a7df75cfa2..31171ef495 100644
--- a/package.json
+++ b/package.json
@@ -72,7 +72,7 @@
     "material-design-icons-iconfont": "^6.1.0",
     "native-promise-only": "^0.8.0-a",
     "page": "^1.11.6",
-    "pdfjs-dist": "2.5.207",
+    "pdfjs-dist": "2.6.347",
     "resize-observer-polyfill": "^1.5.1",
     "screenfull": "^5.1.0",
     "sortablejs": "^1.13.0",
diff --git a/yarn.lock b/yarn.lock
index b20f45aa18..b5805c27ce 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5888,10 +5888,10 @@ path-webpack@0.0.3:
   resolved "https://registry.yarnpkg.com/path-webpack/-/path-webpack-0.0.3.tgz#ff6dec749eec5a94605c04d5f63fc55607a03a16"
   integrity sha1-/23sdJ7sWpRgXATV9j/FVgegOhY=
 
-pdfjs-dist@2.5.207:
-  version "2.5.207"
-  resolved "https://registry.yarnpkg.com/pdfjs-dist/-/pdfjs-dist-2.5.207.tgz#b5e8c19627be64269cd3fb6df3eaaf45ddffe7b6"
-  integrity sha512-xGDUhnCYPfHy+unMXCLCJtlpZaaZ17Ew3WIL0tnSgKFUZXHAPD49GO9xScyszSsQMoutNDgRb+rfBXIaX/lJbw==
+pdfjs-dist@2.6.347:
+  version "2.6.347"
+  resolved "https://registry.yarnpkg.com/pdfjs-dist/-/pdfjs-dist-2.6.347.tgz#f257ed66e83be900cd0fd28524a2187fb9e25cd5"
+  integrity sha512-QC+h7hG2su9v/nU1wEI3SnpPIrqJODL7GTDFvR74ANKGq1AFJW16PH8VWnhpiTi9YcLSFV9xLeWSgq+ckHLdVQ==
 
 picomatch@^2.0.4, picomatch@^2.0.5, picomatch@^2.2.1, picomatch@^2.2.2:
   version "2.2.2"