diff --git a/src/shadowbox/docker/Dockerfile b/src/shadowbox/docker/Dockerfile
index 6909fe530..96d011d77 100644
--- a/src/shadowbox/docker/Dockerfile
+++ b/src/shadowbox/docker/Dockerfile
@@ -38,8 +38,6 @@ FROM ${NODE_IMAGE}
 
 # Save metadata on the software versions we are using.
 LABEL shadowbox.node_version=12.16.3
-# Keep in sync with version in third_party/outline-ss-server
-LABEL shadowbox.outline-ss-server_version=1.2.1
 
 ARG GITHUB_RELEASE
 LABEL shadowbox.github.release="${GITHUB_RELEASE}"
diff --git a/src/shadowbox/package.json b/src/shadowbox/package.json
index 9593a01f8..c8ab9889f 100644
--- a/src/shadowbox/package.json
+++ b/src/shadowbox/package.json
@@ -1,7 +1,7 @@
 {
   "name": "outline-server",
   "private": true,
-  "version": "1.5.0",
+  "version": "1.5.1",
   "description": "Outline server",
   "main": "build/server/main.js",
   "author": "Outline",
diff --git a/third_party/outline-ss-server/METADATA b/third_party/outline-ss-server/METADATA
index 1fc4f6112..c883bd368 100644
--- a/third_party/outline-ss-server/METADATA
+++ b/third_party/outline-ss-server/METADATA
@@ -8,9 +8,9 @@ third_party {
   }
   url {
     type: ARCHIVE
-    value: "https://github.com/Jigsaw-Code/outline-ss-server/releases/tag/v1.2.1"
+    value: "https://github.com/Jigsaw-Code/outline-ss-server/releases/tag/v1.3.1"
   }
   // Keep in sync with the Dockerfile label
-  version: "1.2.1"
-  last_upgrade_date { year: 2020 month: 8 day: 28 }
+  version: "1.3.1"
+  last_upgrade_date { year: 2020 month: 10 day: 27 }
 }
diff --git a/third_party/outline-ss-server/linux/outline-ss-server b/third_party/outline-ss-server/linux/outline-ss-server
index 8182c7f1c..42acea7c9 100755
Binary files a/third_party/outline-ss-server/linux/outline-ss-server and b/third_party/outline-ss-server/linux/outline-ss-server differ
diff --git a/third_party/outline-ss-server/macos/outline-ss-server b/third_party/outline-ss-server/macos/outline-ss-server
index 154c4fa54..3b7f339b2 100755
Binary files a/third_party/outline-ss-server/macos/outline-ss-server and b/third_party/outline-ss-server/macos/outline-ss-server differ