diff --git a/.travis.yml b/.travis.yml
index 9327854..59e818b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,14 @@
-osx_image: xcode9.3
+osx_image: xcode10.2
 language: objective-c
 cache:
 - cocoapods
 - bundler
+gemfile: test/Gemfile
 before_install:
-- gem install cocoapods
+- unset CPATH
+install:
+- bundle install --jobs=3 --retry=3 --path=${BUNDLE_PATH:-vendor/bundle}
+- bundle exec pod setup
 script:
 - rake install
 - cd test
diff --git a/cocoapods-binary.gemspec b/cocoapods-binary.gemspec
index 697aeb2..de525fb 100644
--- a/cocoapods-binary.gemspec
+++ b/cocoapods-binary.gemspec
@@ -22,6 +22,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency "fourflusher", "~> 2.0"
   spec.add_dependency "xcpretty", "~> 0.3.0"
 
-  spec.add_development_dependency 'bundler', '~> 1.3'
+  spec.add_development_dependency 'bundler', '> 1.3'
   spec.add_development_dependency 'rake'
 end
diff --git a/lib/cocoapods-binary/rome/build_framework.rb b/lib/cocoapods-binary/rome/build_framework.rb
index 10c8571..0f87c84 100644
--- a/lib/cocoapods-binary/rome/build_framework.rb
+++ b/lib/cocoapods-binary/rome/build_framework.rb
@@ -42,6 +42,7 @@ def build_for_iosish_platform(sandbox,
   module_name = target.product_module_name
   device_framework_path = "#{build_dir}/#{CONFIGURATION}-#{device}/#{target_name}/#{module_name}.framework"
   simulator_framework_path = "#{build_dir}/#{CONFIGURATION}-#{simulator}/#{target_name}/#{module_name}.framework"
+  output_framework_path = "#{output_path}/#{module_name}.framework"
 
   device_binary = device_framework_path + "/#{module_name}"
   simulator_binary = simulator_framework_path + "/#{module_name}"
@@ -86,6 +87,7 @@ def build_for_iosish_platform(sandbox,
 
   # handle the dSYM files
   device_dsym = "#{device_framework_path}.dSYM"
+  device_dsym_output_path = "#{output_framework_path}.dSYM"
   if File.exist? device_dsym
     # lipo the simulator dsym
     simulator_dsym = "#{simulator_framework_path}.dSYM"
@@ -96,12 +98,14 @@ def build_for_iosish_platform(sandbox,
       FileUtils.mv tmp_lipoed_binary_path, "#{device_framework_path}.dSYM/Contents/Resources/DWARF/#{module_name}", :force => true
     end
     # move
-    FileUtils.mv device_dsym, output_path, :force => true
+    FileUtils.rm_r device_dsym_output_path if Dir.exist? device_dsym_output_path
+    File.rename device_dsym, device_dsym_output_path
   end
 
   # output
   output_path.mkpath unless output_path.exist?
-  FileUtils.mv device_framework_path, output_path, :force => true
+  FileUtils.rm_r output_framework_path if Dir.exist? output_framework_path
+  File.rename device_framework_path, output_framework_path
 
 end
 
diff --git a/test/change_podfile.py b/test/change_podfile.py
index 5f31510..0ea88f0 100644
--- a/test/change_podfile.py
+++ b/test/change_podfile.py
@@ -53,7 +53,7 @@ def addSwiftPod():
 """
 keep_source_code_for_prebuilt_frameworks!
 
-pod "RxCocoa", :binary => true
+pod "RxCocoa", "~> 4.0", :binary => true
 pod "Literal", :binary => true
 """), 
 """
@@ -70,7 +70,7 @@ def revertToSourceCode():
 """
 keep_source_code_for_prebuilt_frameworks!
 
-pod "RxCocoa", :binary => true
+pod "RxCocoa", "~> 4.0", :binary => true
 pod "Literal"
 """), 
 """
@@ -233,6 +233,39 @@ class A {
 """
 ) 
 
+def oldPodVersion():
+    return (wrapper(
+"""
+pod "ReactiveSwift", "= 3.0.0", :binary => true
+""") ,
+"""
+import ReactiveSwift
+class A {
+    // Works on 3.x but not 4.x
+    let a = A.b(SignalProducer<Int, NSError>.empty)
+    static func b<U: BindingSource>(_ b: U) -> Bool {
+        return true
+    }
+}
+"""
+)
+
+def upgradePodVersion():
+    return (wrapper(
+"""
+pod "ReactiveSwift", "= 4.0.0", :binary => true
+""") ,
+"""
+import ReactiveSwift
+class A {
+    func b() {
+        // Works on 4.x but not 3.x
+        Lifetime.make().token.dispose()
+    }
+}
+"""
+)
+
 
 if __name__ == "__main__":
     arg = sys.argv[1]
diff --git a/test/test.sh b/test/test.sh
old mode 100644
new mode 100755
index 4aa46dc..6dbbc01
--- a/test/test.sh
+++ b/test/test.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-set -e
+set -ex
 
 build() {
     xcodebuild -workspace Binary.xcworkspace -scheme Binary ONLY_ACTIVE_ARCH=YES  CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO CODE_SIGNING_ALLOWED=NO -quiet || exit 1 
@@ -7,7 +7,7 @@ build() {
 		
 rm -rf Pods
 
-cases=("initial" "addSwiftPod" "revertToSourceCode" "addDifferentNamePod" "addSubPod" "deleteAPod" "addVendoredLibPod" "universalFlag" "multiplePlatforms" "multiplePlatformsWithALLFlag")
+cases=("initial" "addSwiftPod" "revertToSourceCode" "addDifferentNamePod" "addSubPod" "deleteAPod" "addVendoredLibPod" "universalFlag" "multiplePlatforms" "multiplePlatformsWithALLFlag" "oldPodVersion" "upgradePodVersion")
 for action in ${cases[@]}; do
     python change_podfile.py ${action}
     bundle exec pod install