diff --git a/.travis.yml b/.travis.yml
index e2a7f2e..a3e84dc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,7 @@ jobs:
       osx_image: xcode8.3
       env: SWIFT=3.1
       before_install:
-        gem install cocoapods --prerelease --version 1.7.0.beta.3
+        gem install cocoapods --version '~> 1.8.0'
       install:
         carthage bootstrap --no-build PromiseKit
       script: |
@@ -47,7 +47,10 @@ jobs:
     - <<: *pod
       osx_image: xcode10.2
       env: SWIFT=5.0
-
+    - <<: *pod
+      osx_image: xcode11
+      env: SWIFT=5.1
+      
     - &linux
       stage: swiftpm
       env: SWIFT_BUILD_VERSION=3  SWIFT_VERSION=4.0
@@ -86,7 +89,10 @@ jobs:
     - <<: *linux
       env: SWIFT_BUILD_VERSION=5 SWIFT_VERSION=5.0
       name: Linux / Swift 5.0
-
+    - <<: *linux
+      env: SWIFT_BUILD_VERSION=5 SWIFT_VERSION=5.1
+      name: Linux / Swift 5.1
+      
     - &swiftpm
       stage: swiftpm
       name: Xcode 8.3 / SwiftPM
@@ -100,7 +106,10 @@ jobs:
     - <<: *swiftpm
       name: Xcode 10.0 / SwiftPM
       osx_image: xcode10
-    
+    - <<: *swiftpm
+      name: Xcode 11.0 / SwiftPM
+      osx_image: xcode11
+
     - &carthage
       stage: carthage
       osx_image: xcode9.2
@@ -117,7 +126,9 @@ jobs:
       osx_image: xcode10.1
     - <<: *carthage
       osx_image: xcode10.2
-
+    - <<: *carthage
+      osx_image: xcode11
+      
     - &test
       stage: test
       xcode_scheme: PMKFoundation
diff --git a/Cartfile.resolved b/Cartfile.resolved
index 99f18cf..47a3dc3 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1,2 +1,2 @@
 github "AliSoftware/OHHTTPStubs" "7.0.0"
-github "mxcl/PromiseKit" "6.8.4"
+github "mxcl/PromiseKit" "6.11.0"
diff --git a/Package.resolved b/Package.resolved
index ed8bd26..4225bb9 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -6,7 +6,7 @@
         "repositoryURL": "https://github.com/mxcl/PromiseKit.git",
         "state": {
           "branch": null,
-          "revision": "e0176e7886b3bef5b9a546bcc6b357f6f569f222",
+          "revision": "fe1e9c5b62465227cceb7b0e6e79489ba7b824af",
           "version": "6.8.4"
         }
       }
diff --git a/Sources/NSURLSession+Promise.swift b/Sources/NSURLSession+Promise.swift
index 13259a0..150654f 100644
--- a/Sources/NSURLSession+Promise.swift
+++ b/Sources/NSURLSession+Promise.swift
@@ -2,6 +2,11 @@ import Foundation
 #if !PMKCocoaPods
 import PromiseKit
 #endif
+#if swift(>=4.1)
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
+#endif
 
 /**
  To import the `NSURLSession` category: