diff --git a/pom.xml b/pom.xml
index 77a1b10f..306e9453 100644
--- a/pom.xml
+++ b/pom.xml
@@ -142,7 +142,7 @@
         <dependency>
             <groupId>org.spigotmc</groupId>
             <artifactId>spigot</artifactId>
-            <version>1.16.5-R0.1-SNAPSHOT</version>
+            <version>1.17.1-R0.1-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
 
@@ -177,7 +177,7 @@
         <dependency>
             <groupId>net.coreprotect</groupId>
             <artifactId>coreprotect</artifactId>
-            <version>19.5</version>
+            <version>20.1</version>
             <scope>provided</scope>
         </dependency>
 
@@ -275,9 +275,9 @@
                 <version>3.8.1</version>
                 <configuration>
                     <outputFileName>TotalFreedomMod.jar</outputFileName>
-                    <compilerVersion>11</compilerVersion>
-                    <source>11</source>
-                    <target>11</target>
+                    <compilerVersion>17</compilerVersion>
+                    <source>17</source>
+                    <target>17</target>
                 </configuration>
             </plugin>
 
@@ -401,7 +401,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>3.2.4</version>
+                <version>3.3.0-SNAPSHOT</version>
                 <executions>
                     <execution>
                         <phase>package</phase>
diff --git a/src/main/java/me/totalfreedom/totalfreedommod/ServerInterface.java b/src/main/java/me/totalfreedom/totalfreedommod/ServerInterface.java
index 40abc384..3821a949 100644
--- a/src/main/java/me/totalfreedom/totalfreedommod/ServerInterface.java
+++ b/src/main/java/me/totalfreedom/totalfreedommod/ServerInterface.java
@@ -4,14 +4,14 @@ import java.util.Arrays;
 import java.util.List;
 import me.totalfreedom.totalfreedommod.util.FLog;
 import me.totalfreedom.totalfreedommod.util.FUtil;
-import net.minecraft.server.v1_16_R3.EntityPlayer;
-import net.minecraft.server.v1_16_R3.MinecraftServer;
+import net.minecraft.server.level.EntityPlayer;
+import net.minecraft.server.MinecraftServer;
 import org.bukkit.Bukkit;
-import org.bukkit.craftbukkit.v1_16_R3.CraftServer;
+import org.bukkit.craftbukkit.v1_17_R1.CraftServer;
 
 public class ServerInterface extends FreedomService
 {
-    public static final String COMPILE_NMS_VERSION = "v1_16_R3";
+    public static final String COMPILE_NMS_VERSION = "v1_17_R1";
 
     public static void warnVersion()
     {
@@ -34,16 +34,11 @@ public class ServerInterface extends FreedomService
     {
     }
 
-    public void setOnlineMode(boolean mode)
-    {
-        getServer().setOnlineMode(mode);
-    }
-
     public int purgeWhitelist()
     {
         String[] whitelisted = getServer().getPlayerList().getWhitelisted();
         int size = whitelisted.length;
-        for (EntityPlayer player : getServer().getPlayerList().players)
+        for (EntityPlayer player : getServer().getPlayerList().getPlayers())
         {
             getServer().getPlayerList().getWhitelist().remove(player.getProfile());
         }
diff --git a/src/main/java/me/totalfreedom/totalfreedommod/blocking/SignBlocker.java b/src/main/java/me/totalfreedom/totalfreedommod/blocking/SignBlocker.java
index 261ce274..3fabc837 100644
--- a/src/main/java/me/totalfreedom/totalfreedommod/blocking/SignBlocker.java
+++ b/src/main/java/me/totalfreedom/totalfreedommod/blocking/SignBlocker.java
@@ -1,10 +1,10 @@
 package me.totalfreedom.totalfreedommod.blocking;
 
 import me.totalfreedom.totalfreedommod.FreedomService;
-import net.minecraft.server.v1_16_R3.NBTTagCompound;
+import net.minecraft.nbt.NBTTagCompound;
 import org.bukkit.ChatColor;
 import org.bukkit.Tag;
-import org.bukkit.craftbukkit.v1_16_R3.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.v1_17_R1.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
@@ -35,7 +35,7 @@ public class SignBlocker extends FreedomService
         if (Tag.SIGNS.getValues().contains(event.getBlock().getType()))
         {
             ItemStack sign = event.getItemInHand();
-            net.minecraft.server.v1_16_R3.ItemStack nmsSign = CraftItemStack.asNMSCopy(sign);
+            net.minecraft.world.item.ItemStack nmsSign = CraftItemStack.asNMSCopy(sign);
             NBTTagCompound compound = (nmsSign.hasTag()) ? nmsSign.getTag() : new NBTTagCompound();
             assert compound != null;
             NBTTagCompound bet = compound.getCompound("BlockEntityTag");
diff --git a/src/main/java/me/totalfreedom/totalfreedommod/command/Command_modifyitem.java b/src/main/java/me/totalfreedom/totalfreedommod/command/Command_modifyitem.java
index bb7d6ec7..4ba7ab88 100644
--- a/src/main/java/me/totalfreedom/totalfreedommod/command/Command_modifyitem.java
+++ b/src/main/java/me/totalfreedom/totalfreedommod/command/Command_modifyitem.java
@@ -5,13 +5,13 @@ import java.util.List;
 import java.util.SplittableRandom;
 import me.totalfreedom.totalfreedommod.rank.Rank;
 import me.totalfreedom.totalfreedommod.util.FUtil;
-import net.minecraft.server.v1_16_R3.NBTTagCompound;
-import net.minecraft.server.v1_16_R3.NBTTagList;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
 import org.apache.commons.lang.StringUtils;
 import org.bukkit.Material;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
-import org.bukkit.craftbukkit.v1_16_R3.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.v1_17_R1.inventory.CraftItemStack;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
@@ -151,7 +151,7 @@ public class Command_modifyitem extends FreedomCommand
                 {
                     return false;
                 }
-                net.minecraft.server.v1_16_R3.ItemStack nmsStack = CraftItemStack.asNMSCopy(item);
+                net.minecraft.world.item.ItemStack nmsStack = CraftItemStack.asNMSCopy(item);
                 NBTTagCompound compound = (nmsStack.hasTag()) ? nmsStack.getTag() : new NBTTagCompound();
                 NBTTagList modifiers = getAttributeList(nmsStack);
                 NBTTagCompound cmpnd = new NBTTagCompound();
@@ -202,7 +202,7 @@ public class Command_modifyitem extends FreedomCommand
         return true;
     }
 
-    private NBTTagList getAttributeList(net.minecraft.server.v1_16_R3.ItemStack stack)
+    private NBTTagList getAttributeList(net.minecraft.world.item.ItemStack stack)
     {
         if (stack.getTag() == null)
         {