diff --git a/aio/yarn.lock b/aio/yarn.lock
index 34b8ef826c..9d7c88e036 100644
--- a/aio/yarn.lock
+++ b/aio/yarn.lock
@@ -3757,13 +3757,12 @@ event-emitter@~0.3.5:
     d "1"
     es5-ext "~0.10.14"
 
-event-stream@~3.3.0:
-  version "3.3.6"
-  resolved "https://registry.yarnpkg.com/event-stream/-/event-stream-3.3.6.tgz#cac1230890e07e73ec9cacd038f60a5b66173eef"
-  integrity sha512-dGXNg4F/FgVzlApjzItL+7naHutA3fDqbV/zAZqDDlXTjiMnQmZKu+prImWKszeBM5UQeGvAl3u1wBiKeDh61g==
+event-stream@3.3.5, event-stream@~3.3.0:
+  version "3.3.5"
+  resolved "https://registry.yarnpkg.com/event-stream/-/event-stream-3.3.5.tgz#e5dd8989543630d94c6cf4d657120341fa31636b"
+  integrity sha512-vyibDcu5JL20Me1fP734QBH/kenBGLZap2n0+XXM7mvuUPzJ20Ydqj1aKcIeMdri1p+PU+4yAKugjN8KCVst+g==
   dependencies:
     duplexer "^0.1.1"
-    flatmap-stream "^0.1.0"
     from "^0.1.7"
     map-stream "0.0.7"
     pause-stream "^0.0.11"
@@ -4297,11 +4296,6 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
-flatmap-stream@^0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/flatmap-stream/-/flatmap-stream-0.1.0.tgz#ed54e01422cd29281800914fcb968d58b685d5f1"
-  integrity sha512-Nlic4ZRYxikqnK5rj3YoxDVKGGtUjcNDUtvQ7XsdGLZmMwdUYnXf10o1zcXtzEZTBgc6GxeRpQxV/Wu3WPIIHA==
-
 flatmap@0.0.3:
   version "0.0.3"
   resolved "https://registry.yarnpkg.com/flatmap/-/flatmap-0.0.3.tgz#1f18a4d938152d495965f9c958d923ab2dd669b4"