diff --git a/EosioSwift.xcodeproj/project.pbxproj b/EosioSwift.xcodeproj/project.pbxproj
index 8f588cc0..21748664 100644
--- a/EosioSwift.xcodeproj/project.pbxproj
+++ b/EosioSwift.xcodeproj/project.pbxproj
@@ -440,10 +440,11 @@
 				TargetAttributes = {
 					6B80D25E21FA6DDF00716A7B = {
 						CreatedOnToolsVersion = 10.1;
-						LastSwiftMigration = 1010;
+						LastSwiftMigration = 1110;
 					};
 					6B80D26721FA6DDF00716A7B = {
 						CreatedOnToolsVersion = 10.1;
+						LastSwiftMigration = 1110;
 					};
 				};
 			};
@@ -789,7 +790,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -817,7 +818,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = one.block.EosioSwift;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -838,7 +839,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = one.block.EosioSwiftTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -859,7 +860,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = one.block.EosioSwiftTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
diff --git a/EosioSwift/Crypto/Base58String.swift b/EosioSwift/Crypto/Base58String.swift
index ebd694fc..7aad8908 100644
--- a/EosioSwift/Crypto/Base58String.swift
+++ b/EosioSwift/Crypto/Base58String.swift
@@ -46,7 +46,7 @@ public extension Data {
         let byteString = [UInt8](string.utf8)
         
         for ch in byteString.reversed() {
-            if let index = alphabet.index(of: ch) {
+            if let index = alphabet.firstIndex(of: ch) {
                 answer = answer + (j * BigUInt(index))
                 j *= radix
             } else {
diff --git a/EosioSwift/Crypto/RIPEMD160.swift b/EosioSwift/Crypto/RIPEMD160.swift
index d76e4cfe..e66d82be 100755
--- a/EosioSwift/Crypto/RIPEMD160.swift
+++ b/EosioSwift/Crypto/RIPEMD160.swift
@@ -306,8 +306,9 @@ public struct RIPEMD160 {
     }
     
     public mutating func update(data: Data) {
-        data.withUnsafeBytes { (ptr: UnsafePointer<UInt8>) in
-            var ptr = ptr
+        data.withUnsafeBytes { ptr in
+            let typedPtr = ptr.bindMemory(to: UInt8.self)
+            guard var ptr = typedPtr.baseAddress else { return }
             var length = data.count
             var X = [UInt32](repeating: 0, count: 16)
             
@@ -315,7 +316,10 @@ public struct RIPEMD160 {
             if buffer.count > 0 && buffer.count + length >= 64 {
                 let amount = 64 - buffer.count
                 buffer.append(ptr, count: amount)
-                buffer.withUnsafeBytes { _ = memcpy(&X, $0, 64) }
+                buffer.withUnsafeBytes { ptr in
+                    guard let baseAddress = ptr.baseAddress else { return }
+                    _ = memcpy(&X, baseAddress, 64)
+                }
                 compress(X)
                 ptr += amount
                 length -= amount
@@ -329,15 +333,18 @@ public struct RIPEMD160 {
             }
             // Save remaining unprocessed bytes:
             buffer = Data(bytes: ptr, count: length)
+            count += Int64(data.count)
         }
-        count += Int64(data.count)
     }
     
     public mutating func finalize() -> Data {
         var X = [UInt32](repeating: 0, count: 16)
         /* append the bit m_n == 1 */
         buffer.append(0x80)
-        buffer.withUnsafeBytes { _ = memcpy(&X, $0, buffer.count) }
+        buffer.withUnsafeBytes { ptr in
+            guard let baseAddress = ptr.baseAddress else { return }
+            _ = memcpy(&X, baseAddress, buffer.count)
+        }
         
         if (count & 63) > 55 {
             /* length goes to next block */
@@ -353,12 +360,14 @@ public struct RIPEMD160 {
         compress(X)
         
         var data = Data(count: 20)
-        data.withUnsafeMutableBytes { (ptr: UnsafeMutablePointer<UInt32>) in
-            ptr[0] = MDbuf.0
-            ptr[1] = MDbuf.1
-            ptr[2] = MDbuf.2
-            ptr[3] = MDbuf.3
-            ptr[4] = MDbuf.4
+        data.withUnsafeMutableBytes { ptr in
+            let typedPtr = ptr.bindMemory(to: UInt32.self)
+            guard let baseAddress = typedPtr.baseAddress else { return }
+            baseAddress[0] = MDbuf.0
+            baseAddress[1] = MDbuf.1
+            baseAddress[2] = MDbuf.2
+            baseAddress[3] = MDbuf.3
+            baseAddress[4] = MDbuf.4
         }
         
         buffer = Data()
@@ -386,8 +395,8 @@ public extension RIPEMD160 {
         var key = key
         key.count = 64 // Truncate to 64 bytes or fill-up with zeros.
         
-        let outerKeyPad = Data(bytes: key.map { $0 ^ 0x5c })
-        let innerKeyPad = Data(bytes: key.map { $0 ^ 0x36 })
+        let outerKeyPad = Data(key.map { $0 ^ 0x5c })
+        let innerKeyPad = Data(key.map { $0 ^ 0x36 })
         
         var innerMd = RIPEMD160()
         innerMd.update(data: innerKeyPad)
diff --git a/EosioSwift/Extensions/DataExtensions.swift b/EosioSwift/Extensions/DataExtensions.swift
index 5569a319..f6506c86 100644
--- a/EosioSwift/Extensions/DataExtensions.swift
+++ b/EosioSwift/Extensions/DataExtensions.swift
@@ -75,10 +75,11 @@ public extension Data {
     /// Returns the SHA256 hash of the data.
     var sha256: Data {
         var hash = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
-        self.withUnsafeBytes {
-            _ = CC_SHA256($0, CC_LONG(self.count), &hash)
+        self.withUnsafeBytes { ptr in
+            guard let baseAddress = ptr.baseAddress else { return }
+            _ = CC_SHA256(baseAddress, CC_LONG(self.count), &hash)
         }
-        return Data(bytes: hash)
+        return Data(hash)
     }
 
     /// Returns the current Data as a base58 encoded String.
diff --git a/EosioSwift/Extensions/EosioKeySignatureExtensions.swift b/EosioSwift/Extensions/EosioKeySignatureExtensions.swift
index 6bcf7a92..fcc6705e 100644
--- a/EosioSwift/Extensions/EosioKeySignatureExtensions.swift
+++ b/EosioSwift/Extensions/EosioKeySignatureExtensions.swift
@@ -56,7 +56,7 @@ public extension Data {
         let x = uncompressedKey[1...32] // swiftlint:disable:this identifier_name
         let yLastByte = uncompressedKey[64]
         let flag: UInt8 = 2 + (yLastByte % 2)
-        let compressedKey = Data(bytes: [flag]) + x
+        let compressedKey = Data([flag]) + x
         return compressedKey
     }
 
@@ -229,7 +229,7 @@ public extension Data {
         }
 
         if key.count == 33 {
-            guard key.prefix(1) == Data(bytes: [0x80]) else {
+            guard key.prefix(1) == Data([0x80]) else {
                 throw EosioError(.signatureProviderError, reason: "33 byte private key: \(key.hex) does not begin with 80")
             }
             key = key.suffix(key.count-1)
diff --git a/EosioSwift/Extensions/StringExtensions.swift b/EosioSwift/Extensions/StringExtensions.swift
index c9dec8b0..2f04381d 100644
--- a/EosioSwift/Extensions/StringExtensions.swift
+++ b/EosioSwift/Extensions/StringExtensions.swift
@@ -60,14 +60,14 @@ public extension String {
     /// Converts the string to a dictionary if it is convertible to a dictionary (i.e., it is a JSON string.) and returns the dictionary. Otherwise, returns `nil`.
     var toJsonDictionary: [String: Any]? {
         guard let data = self.data(using: .utf8) else { return nil }
-        let dict = (try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [String: Any]) ?? nil
+        let dict = (try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments)) as? [String: Any]
         return dict
     }
 
     /// Converts the string to a array if it is convertible to a array (i.e., it is a JSON string.) and returns the array. Otherwise, returns `nil`.
     var toJsonArray: [Any]? {
         guard let data = self.data(using: .utf8) else { return nil }
-        let array = (try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [Any]) ?? nil
+        let array = (try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments)) as? [Any]
         return array
     }
 
diff --git a/Podfile b/Podfile
index db1c046e..f84247c9 100644
--- a/Podfile
+++ b/Podfile
@@ -6,11 +6,11 @@ target 'EosioSwift' do
   target 'EosioSwiftTests' do
     inherit! :search_paths
     pod 'OHHTTPStubs/Swift'
-    pod 'BigInt', '~> 3.1', :inhibit_warnings => true
+    pod 'BigInt', '~> 5.0'
     pod 'PromiseKit', '~> 6.8'
   end
 
-  pod 'BigInt', '~> 3.1', :inhibit_warnings => true
+  pod 'BigInt', '~> 5.0'
   pod 'SwiftLint'
   pod 'PromiseKit', '~> 6.8'
 end
diff --git a/Podfile.lock b/Podfile.lock
index dc3281f8..f4383db3 100644
--- a/Podfile.lock
+++ b/Podfile.lock
@@ -1,6 +1,5 @@
 PODS:
-  - BigInt (3.1.0):
-    - SipHash (~> 1.2)
+  - BigInt (5.0.0)
   - OHHTTPStubs/Core (8.0.0)
   - OHHTTPStubs/Default (8.0.0):
     - OHHTTPStubs/Core
@@ -23,11 +22,10 @@ PODS:
     - PromiseKit/CorePromise
   - PromiseKit/UIKit (6.8.4):
     - PromiseKit/CorePromise
-  - SipHash (1.2.2)
   - SwiftLint (0.32.0)
 
 DEPENDENCIES:
-  - BigInt (~> 3.1)
+  - BigInt (~> 5.0)
   - OHHTTPStubs/Swift
   - PromiseKit (~> 6.8)
   - SwiftLint
@@ -37,16 +35,14 @@ SPEC REPOS:
     - BigInt
     - OHHTTPStubs
     - PromiseKit
-    - SipHash
     - SwiftLint
 
 SPEC CHECKSUMS:
-  BigInt: 76b5dfdfa3e2e478d4ffdf161aeede5502e2742f
+  BigInt: 74b4d88367b0e819d9f77393549226d36faeb0d8
   OHHTTPStubs: 9cbce6364bec557cc3439aa6bb7514670d780881
   PromiseKit: 51794a832647e7b819336dc2279039ce9f1cc49b
-  SipHash: fad90a4683e420c52ef28063063dbbce248ea6d4
   SwiftLint: 009a898ef2a1c851f45e1b59349bf6ff2ddc990d
 
-PODFILE CHECKSUM: 1d10bec70f8d2560be35e67e47b034772bba25f7
+PODFILE CHECKSUM: c2e188f1ae1612a01b8b39f8a779631954878ead
 
 COCOAPODS: 1.8.3