diff --git a/lib/curl_builder.rb b/lib/curl_builder.rb
index 3b98375..bb2f451 100644
--- a/lib/curl_builder.rb
+++ b/lib/curl_builder.rb
@@ -60,8 +60,8 @@ module CurlBuilder
     verbose:            false,
     debug_symbols:      false,
     curldebug:          false,
-    sdk_version:        "9.3",
-    osx_sdk_version:    "10.11",
+    sdk_version:        "10.2",
+    osx_sdk_version:    "10.12",
     libcurl_version:    "7.49.1",
     architectures:      %w(i386 armv7 armv7s arm64 x86_64),
     xcode_home:         "/Applications/Xcode.app/Contents/Developer",
diff --git a/lib/curl_builder/compiler.rb b/lib/curl_builder/compiler.rb
index 3915cfd..c946424 100644
--- a/lib/curl_builder/compiler.rb
+++ b/lib/curl_builder/compiler.rb
@@ -96,7 +96,7 @@ def compilation_flags_for(platform, architecture)
         version = "6.0"
         min_version = "-miphoneos-version-min=#{version}"
       elsif platform == "iPhoneOS"
-        version = architecture == "arm64" ? "6.0" : "5.0"
+        version = "6.0"
         min_version = "-miphoneos-version-min=#{version}"
       else
         min_version = "-mmacosx-version-min=10.7"