diff --git a/Package.resolved b/Package.resolved
index 80d3efe..b8cf4ef 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -32,8 +32,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/mxcl/PromiseKit.git",
       "state" : {
-        "revision" : "8a98e31a47854d3180882c8068cc4d9381bf382d",
-        "version" : "6.22.1"
+        "revision" : "6fcc08077124e9747f1ec7bd8bb78f5caffe5a79",
+        "version" : "8.1.2"
       }
     },
     {
diff --git a/Package.swift b/Package.swift
index c86eb3d..79429f6 100644
--- a/Package.swift
+++ b/Package.swift
@@ -20,7 +20,7 @@ let package = Package(
         .package(url: "https://github.com/Quick/Nimble.git", from: "10.0.0"),
         .package(url: "https://github.com/Quick/Quick.git", from: "5.0.1"),
         .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.5.0"),
-        .package(url: "https://github.com/mxcl/PromiseKit.git", from: "6.22.1"),
+        .package(url: "https://github.com/mxcl/PromiseKit.git", from: "8.1.2"),
         .package(url: "https://github.com/mxcl/Version.git", from: "2.1.0"),
         .package(url: "https://github.com/sharplet/Regex.git", from: "2.1.1"),
     ],