diff --git a/.gitignore b/.gitignore
index 4046747..aaea0fe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,8 +51,6 @@ Podfile.lock
 #
 # Add this line if you want to avoid checking in source code from Carthage dependencies.
 Carthage/Checkouts
-Cartfile.resolved
-
 Carthage/Build
 
 # Go Mobile Build results and dependency sources
diff --git a/.travis.yml b/.travis.yml
index cb77db7..8a3f02b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,10 +9,26 @@ before_install:
 install:
   - gem update fastlane
 before_script:
-  - travis_wait 45 carthage bootstrap --platform iOS
-  - ./gopenpgp_build.sh
+  - |
+    if [ ! $(git diff --name-only master..."$TRAVIS_COMMIT" | grep "Carthage.lock") ] && [ -d "Carthage/Build" ]; then
+      echo "Use cached carthage dependencies."
+    else
+      echo "Bootstrap carthage dependencies."
+      travis_wait 45 carthage bootstrap --platform iOS
+    fi
+  - |
+    if [ ! $(git diff --name-only master..."$TRAVIS_COMMIT" | grep "gopenpgp_build.sh") ] && [ -d "go/dist" ]; then
+      echo "Use cached go dependencies."
+    else
+      echo "Build go dependencies."
+      ./gopenpgp_build.sh
+    fi
 script:
   - if [ "$TRAVIS_BRANCH" = "master" ] && [ "$TRAVIS_EVENT_TYPE" = "push" ]; then fastlane test && fastlane beta; else fastlane test; fi
+cache:
+  directories:
+    - Carthage
+    - go
 env:
   global:
   - secure: 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
diff --git a/Cartfile.resolved b/Cartfile.resolved
new file mode 100644
index 0000000..3067882
--- /dev/null
+++ b/Cartfile.resolved
@@ -0,0 +1,7 @@
+github "SVProgressHUD/SVProgressHUD" "2.2.5"
+github "kishikawakatsumi/KeychainAccess" "v3.2.0"
+github "leonbreedt/FavIcon" "3.0.6"
+github "libgit2/objective-git" "0.14.2"
+github "mattrubin/Base32" "1.1.2+xcode10.2"
+github "mattrubin/OneTimePassword" "3.1.5"
+github "radex/SwiftyUserDefaults" "4.0.0"