diff --git a/package.json b/package.json
index 746cee526c9..92e183b13d9 100644
--- a/package.json
+++ b/package.json
@@ -88,6 +88,7 @@
     "xterm-addon-search": "0.9.0-beta.3",
     "xterm-addon-unicode11": "0.3.0-beta.5",
     "xterm-addon-webgl": "0.12.0-beta.5",
+    "xterm-headless": "4.13.0-alpha3",
     "yauzl": "^2.9.2",
     "yazl": "^2.4.3"
   },
diff --git a/yarn.lock b/yarn.lock
index 8d38724463b..748d1ded19a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11107,6 +11107,11 @@ xterm-addon-webgl@0.12.0-beta.5:
   resolved "https://registry.yarnpkg.com/xterm-addon-webgl/-/xterm-addon-webgl-0.12.0-beta.5.tgz#97524d1a455d15096c1999b8ce73ab0c6ecc8efa"
   integrity sha512-Od9yFikC414E4Fm1W8akhSiNDUWat+RLsEYJMwvcEW4HprUVJije6n2Lrzj4roNl4pnSPUhF89zG6NY4lZXqDg==
 
+xterm-headless@4.13.0-alpha3:
+  version "4.13.0-alpha3"
+  resolved "https://registry.yarnpkg.com/xterm-headless/-/xterm-headless-4.13.0-alpha3.tgz#41379abc022a9ce3009da0d40f3a6bc220b762dd"
+  integrity sha512-CkOdhAEkopgeN0/Cjro6/Pp6/cUay+9TaP7GbwkDTqDp0VDv4aNTZLmub68OJXjCEV3y3C8ilXQKgWz60rtSxg==
+
 xterm@4.14.0-beta.6:
   version "4.14.0-beta.6"
   resolved "https://registry.yarnpkg.com/xterm/-/xterm-4.14.0-beta.6.tgz#f39ec3298059dbfe09f8f5429ad55bc5472fdc4a"