diff --git a/pom.xml b/pom.xml
index 992c7362..7dd4a45a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -82,12 +82,12 @@
       <dependency>
         <groupId>net.java.dev.jna</groupId>
         <artifactId>jna</artifactId>
-        <version>4.5.1</version>
+        <version>5.6.0</version>
       </dependency>
       <dependency>
         <groupId>net.java.dev.jna</groupId>
         <artifactId>jna-platform</artifactId>
-        <version>4.5.1</version>
+        <version>5.6.0</version>
       </dependency>
       <dependency>
         <groupId>org.ini4j</groupId>
@@ -97,12 +97,12 @@
       <dependency>
         <groupId>org.javadelight</groupId>
         <artifactId>delight-nashorn-sandbox</artifactId>
-        <version>0.1.14</version>
+        <version>0.1.28</version>
       </dependency>
       <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
-        <version>1.7.25</version>
+        <version>1.7.30</version>
       </dependency>
 
       <!-- test dependencies -->
diff --git a/src/main/java/com/github/markusbernhardt/proxy/jna/win/WTypes2.java b/src/main/java/com/github/markusbernhardt/proxy/jna/win/WTypes2.java
index 87cdd29d..6d0605c4 100644
--- a/src/main/java/com/github/markusbernhardt/proxy/jna/win/WTypes2.java
+++ b/src/main/java/com/github/markusbernhardt/proxy/jna/win/WTypes2.java
@@ -1,6 +1,7 @@
 package com.github.markusbernhardt.proxy.jna.win;
 
 import com.github.markusbernhardt.proxy.util.Logger;
+import com.sun.jna.Native;
 import com.sun.jna.Pointer;
 import com.sun.jna.platform.win32.Kernel32;
 import com.sun.jna.platform.win32.WTypes;
@@ -39,7 +40,7 @@ private WTypes2() {}
     public static class LPWSTRByReference extends ByReference {
 
         public LPWSTRByReference() {
-            super(Pointer.SIZE);
+            super(Native.POINTER_SIZE);
 			// memory cleanup
 			getPointer().setPointer(0, null);
         }
diff --git a/src/main/java/com/github/markusbernhardt/proxy/jna/win/WinHttp.java b/src/main/java/com/github/markusbernhardt/proxy/jna/win/WinHttp.java
index 923bb7f5..88b1edda 100644
--- a/src/main/java/com/github/markusbernhardt/proxy/jna/win/WinHttp.java
+++ b/src/main/java/com/github/markusbernhardt/proxy/jna/win/WinHttp.java
@@ -13,7 +13,7 @@
  */
 public interface WinHttp extends StdCallLibrary {
 
-	WinHttp INSTANCE = (WinHttp) Native.loadLibrary("winhttp", WinHttp.class, W32APIOptions.UNICODE_OPTIONS);
+	WinHttp INSTANCE = (WinHttp) Native.load("winhttp", WinHttp.class, W32APIOptions.UNICODE_OPTIONS);
 
 	/**
 	 * Use DHCP to locate the proxy auto-configuration file.