diff --git a/.swift-version b/.swift-version
index 9f55b2c..8c50098 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-3.0
+3.1
diff --git a/MessagePack.swift.podspec b/MessagePack.swift.podspec
index 8926b21..8cc85a0 100644
--- a/MessagePack.swift.podspec
+++ b/MessagePack.swift.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = 'MessagePack.swift'
-  s.version      = '2.0.1'
+  s.version      = '2.0.2'
   s.summary      = "It's like JSON, but fast and small...and Swift!"
   s.homepage     = 'https://github.com/a2/MessagePack.swift'
   s.license      = 'MIT'
diff --git a/MessagePack.xcodeproj/project.pbxproj b/MessagePack.xcodeproj/project.pbxproj
index 3fb0bdc..9e1be4e 100644
--- a/MessagePack.xcodeproj/project.pbxproj
+++ b/MessagePack.xcodeproj/project.pbxproj
@@ -53,8 +53,9 @@
          children = (
             OBJ_16,
          );
-         path = "Tests";
-         sourceTree = "<group>";
+         name = "Tests";
+         path = "";
+         sourceTree = "SOURCE_ROOT";
       };
       OBJ_16 = {
          isa = "PBXGroup";
@@ -158,6 +159,7 @@
       OBJ_3 = {
          isa = "XCBuildConfiguration";
          buildSettings = {
+            CLANG_ENABLE_OBJC_ARC = "YES";
             COMBINE_HIDPI_IMAGES = "YES";
             COPY_PHASE_STRIP = "NO";
             DEBUG_INFORMATION_FORMAT = "dwarf";
@@ -258,6 +260,7 @@
       OBJ_4 = {
          isa = "XCBuildConfiguration";
          buildSettings = {
+            CLANG_ENABLE_OBJC_ARC = "YES";
             COMBINE_HIDPI_IMAGES = "YES";
             COPY_PHASE_STRIP = "YES";
             DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
@@ -279,7 +282,7 @@
                "watchsimulator",
             );
             SWIFT_ACTIVE_COMPILATION_CONDITIONS = "SWIFT_PACKAGE";
-            SWIFT_OPTIMIZATION_LEVEL = "-O";
+            SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
             SWIFT_VERSION = "3.0";
             USE_HEADERMAP = "NO";
          };
@@ -309,6 +312,7 @@
             PRODUCT_BUNDLE_IDENTIFIER = "MessagePack";
             PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
             PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+            SKIP_INSTALL = "YES";
             TARGET_NAME = "MessagePack";
          };
          name = "Debug";
@@ -337,6 +341,7 @@
             PRODUCT_BUNDLE_IDENTIFIER = "MessagePack";
             PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
             PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+            SKIP_INSTALL = "YES";
             TARGET_NAME = "MessagePack";
          };
          name = "Release";
@@ -431,6 +436,7 @@
             INFOPLIST_FILE = "MessagePack.xcodeproj/MessagePackTests_Info.plist";
             LD_RUNPATH_SEARCH_PATHS = (
                "@loader_path/../Frameworks",
+               "@loader_path/Frameworks",
             );
             OTHER_LDFLAGS = (
                "$(inherited)",
@@ -456,6 +462,7 @@
             INFOPLIST_FILE = "MessagePack.xcodeproj/MessagePackTests_Info.plist";
             LD_RUNPATH_SEARCH_PATHS = (
                "@loader_path/../Frameworks",
+               "@loader_path/Frameworks",
             );
             OTHER_LDFLAGS = (
                "$(inherited)",
@@ -560,8 +567,9 @@
          children = (
             OBJ_8,
          );
-         path = "Sources";
-         sourceTree = "<group>";
+         name = "Sources";
+         path = "";
+         sourceTree = "SOURCE_ROOT";
       };
       OBJ_70 = {
          isa = "PBXBuildFile";
diff --git a/MessagePack.xcodeproj/xcshareddata/xcschemes/MessagePack.xcscheme b/MessagePack.xcodeproj/xcshareddata/xcschemes/MessagePack.xcscheme
index beb0049..08d1d8a 100644
--- a/MessagePack.xcodeproj/xcshareddata/xcschemes/MessagePack.xcscheme
+++ b/MessagePack.xcodeproj/xcshareddata/xcschemes/MessagePack.xcscheme
@@ -1,33 +1,81 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<Scheme LastUpgradeVersion = "9999" version = "1.3">
-  <BuildAction parallelizeBuildables = "YES" buildImplicitDependencies = "YES">
-    <BuildActionEntries>
-      <BuildActionEntry buildForTesting = "YES" buildForRunning = "YES" buildForProfiling = "YES" buildForArchiving = "YES" buildForAnalyzing = "YES">
-        <BuildableReference
-          BuildableIdentifier = "primary"
-          BuildableName = "'lib$(TARGET_NAME)'"
-          BlueprintName = "MessagePack"
-          ReferencedContainer = "container:MessagePack.xcodeproj">
-        </BuildableReference>
-      </BuildActionEntry>
-    </BuildActionEntries>
-  </BuildAction>
-  <TestAction
-    buildConfiguration = "Debug"
-    selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-    selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-    shouldUseLaunchSchemeArgsEnv = "YES"
-    codeCoverageEnabled = "NO">
-    <Testables>
-    <TestableReference
-      skipped = "NO">
-      <BuildableReference
-        BuildableIdentifier = "primary"
-        BuildableName = "'$(TARGET_NAME)'"
-        BlueprintName = "MessagePackTests"
-        ReferencedContainer = "container:MessagePack.xcodeproj">
-      </BuildableReference>
-    </TestableReference>
-    </Testables>
-  </TestAction>
+<Scheme
+   LastUpgradeVersion = "9999"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "OBJ_38"
+               BuildableName = "MessagePack.framework"
+               BlueprintName = "MessagePack"
+               ReferencedContainer = "container:MessagePack.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "OBJ_50"
+               BuildableName = "MessagePackTests.xctest"
+               BlueprintName = "MessagePackTests"
+               ReferencedContainer = "container:MessagePack.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "OBJ_38"
+            BuildableName = "MessagePack.framework"
+            BlueprintName = "MessagePack"
+            ReferencedContainer = "container:MessagePack.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
 </Scheme>
diff --git a/Sources/MessagePack/Pack.swift b/Sources/MessagePack/Pack.swift
index f688da4..567ed3f 100644
--- a/Sources/MessagePack/Pack.swift
+++ b/Sources/MessagePack/Pack.swift
@@ -80,12 +80,10 @@ public func pack(_ value: MessagePackValue) -> Data {
         return packPositiveInteger(value)
 
     case .float(let value):
-        let integerValue = unsafeBitCast(value, to: UInt32.self)
-        return Data([0xca]) + packInteger(UInt64(integerValue), parts: 4)
+        return Data([0xca]) + packInteger(UInt64(value.bitPattern), parts: 4)
 
     case .double(let value):
-        let integerValue = unsafeBitCast(value, to: UInt64.self)
-        return Data([0xcb]) + packInteger(integerValue, parts: 8)
+        return Data([0xcb]) + packInteger(value.bitPattern, parts: 8)
 
     case .string(let string):
         let utf8 = string.utf8
diff --git a/Sources/MessagePack/Unpack.swift b/Sources/MessagePack/Unpack.swift
index 0aebdd1..35a7ed5 100644
--- a/Sources/MessagePack/Unpack.swift
+++ b/Sources/MessagePack/Unpack.swift
@@ -185,13 +185,13 @@ public func unpack(_ data: Data, compatibility: Bool = false) throws -> (value:
     // float 32
     case 0xca:
         let (intValue, remainder) = try unpackInteger(data, count: 4)
-        let float = unsafeBitCast(UInt32(truncatingBitPattern: intValue), to: Float.self)
+        let float = Float(bitPattern: UInt32(truncatingBitPattern: intValue))
         return (.float(float), remainder)
 
     // float 64
     case 0xcb:
         let (intValue, remainder) = try unpackInteger(data, count: 8)
-        let double = unsafeBitCast(intValue, to: Double.self)
+        let double = Double(bitPattern: intValue)
         return (.double(double), remainder)
 
     // uint 8, 16, 32, 64