diff --git a/package.json b/package.json
index f6416640..d29dcb09 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "task-graph-runner": "^1.0.1",
     "temp-write": "^3.4.0",
     "typeable-promisify": "^2.0.1",
-    "yarn": "^1.9.4"
+    "yarn": "^1.17.3"
   },
   "jest": {
     "resetMocks": true,
diff --git a/yarn.lock b/yarn.lock
index e2c55c1e..0a48ac08 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4482,7 +4482,7 @@ yargs@~3.10.0:
     decamelize "^1.0.0"
     window-size "0.1.0"
 
-yarn@^1.9.4:
-  version "1.9.4"
-  resolved "https://registry.yarnpkg.com/yarn/-/yarn-1.9.4.tgz#3b82d8446b652775723900b470d966861976924b"
-  integrity sha1-O4LYRGtlJ3VyOQC0cNlmhhl2kks=
+yarn@^1.17.3:
+  version "1.17.3"
+  resolved "https://registry.yarnpkg.com/yarn/-/yarn-1.17.3.tgz#60e0b77d079eb78e753bb616f7592b51b6a9adce"
+  integrity sha512-CgA8o7nRZaQvmeF/WBx2FC7f9W/0X59T2IaLYqgMo6637wfp5mMEsM3YXoJtKUspnpmDJKl/gGFhnqS+sON7hA==