diff --git a/Cartfile b/Cartfile
index da47fc7b106..cdbd45826ee 100644
--- a/Cartfile
+++ b/Cartfile
@@ -1 +1 @@
-github "mxcl/PromiseKit" == 6.21.0
+github "mxcl/PromiseKit" == 6.22.1
diff --git a/Cartfile.resolved b/Cartfile.resolved
index 2fa78a98d02..e1b13123998 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1 +1 @@
-github "mxcl/PromiseKit" "6.21.0"
+github "mxcl/PromiseKit" "6.22.1"