diff --git a/Package.resolved b/Package.resolved
index e66dde2..391dbcc 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -33,8 +33,8 @@
         "repositoryURL": "https://github.com/Quick/Nimble.git",
         "state": {
           "branch": null,
-          "revision": "7a54aaf19a8ef16f67787c260fda81ead7ba4d67",
-          "version": "9.0.1"
+          "revision": "d258c638d9ef214723a857a23f4113773aad28fb",
+          "version": "9.1.0"
         }
       },
       {
@@ -42,8 +42,8 @@
         "repositoryURL": "https://github.com/Quick/Quick.git",
         "state": {
           "branch": null,
-          "revision": "8cce6acd38f965f5baa3167b939f86500314022b",
-          "version": "3.1.2"
+          "revision": "bd86ca0141e3cfb333546de5a11ede63f0c4a0e6",
+          "version": "4.0.0"
         }
       },
       {
diff --git a/Package.swift b/Package.swift
index b2769ff..4066a86 100644
--- a/Package.swift
+++ b/Package.swift
@@ -22,8 +22,8 @@ let package = Package(
     dependencies: [
         // Dependencies declare other packages that this package depends on.
         .package(url: "https://github.com/Carthage/Commandant.git", from: "0.18.0"),
-        .package(url: "https://github.com/Quick/Nimble.git", from: "9.0.1"),
-        .package(url: "https://github.com/Quick/Quick.git", from: "3.1.2"),
+        .package(url: "https://github.com/Quick/Nimble.git", from: "9.1.0"),
+        .package(url: "https://github.com/Quick/Quick.git", from: "4.0.0"),
         .package(url: "https://github.com/mxcl/Version.git", from: "2.0.0"),
     ],
     targets: [