diff --git a/bootstrap/spigot/pom.xml b/bootstrap/spigot/pom.xml
index 12c8292e9..fcc0ee410 100644
--- a/bootstrap/spigot/pom.xml
+++ b/bootstrap/spigot/pom.xml
@@ -10,6 +10,13 @@
     </parent>
     <artifactId>bootstrap-spigot</artifactId>
 
+    <repositories>
+        <repository>
+            <id>viaversion-repo</id>
+            <url>https://repo.viaversion.com</url>
+        </repository>
+    </repositories>
+
     <dependencies>
         <dependency>
             <groupId>org.geysermc</groupId>
@@ -26,7 +33,7 @@
         <dependency>
             <groupId>us.myles</groupId>
             <artifactId>viaversion</artifactId>
-            <version>3.2.0</version>
+            <version>4.0.0-21w16a</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
diff --git a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/GeyserSpigotPlugin.java b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/GeyserSpigotPlugin.java
index 671ad18cf..b34ce3198 100644
--- a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/GeyserSpigotPlugin.java
+++ b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/GeyserSpigotPlugin.java
@@ -46,11 +46,9 @@ import org.geysermc.platform.spigot.command.SpigotCommandSender;
 import org.geysermc.platform.spigot.world.GeyserSpigot1_11CraftingListener;
 import org.geysermc.platform.spigot.world.GeyserSpigotBlockPlaceListener;
 import org.geysermc.platform.spigot.world.manager.*;
-import us.myles.ViaVersion.api.Pair;
 import us.myles.ViaVersion.api.Via;
 import us.myles.ViaVersion.api.data.MappingData;
-import us.myles.ViaVersion.api.protocol.Protocol;
-import us.myles.ViaVersion.api.protocol.ProtocolRegistry;
+import us.myles.ViaVersion.api.protocol.ProtocolPathEntry;
 import us.myles.ViaVersion.api.protocol.ProtocolVersion;
 
 import java.io.File;
@@ -137,9 +135,9 @@ public class GeyserSpigotPlugin extends JavaPlugin implements GeyserBootstrap {
 
         this.geyserCommandManager = new GeyserSpigotCommandManager(this, connector);
 
-        boolean isViaVersion = (Bukkit.getPluginManager().getPlugin("ViaVersion") != null);
+        boolean isViaVersion = Bukkit.getPluginManager().getPlugin("ViaVersion") != null;
         if (isViaVersion) {
-            if (!isCompatible(Via.getAPI().getVersion().replace("-SNAPSHOT", ""), "3.2.0")) {
+            if (!Via.getAPI().getVersion().contains("4.0.0")) {
                 geyserLogger.warning(LanguageUtils.getLocaleStringLog("geyser.bootstrap.viaversion.too_old",
                         "https://ci.viaversion.com/job/ViaVersion/"));
                 isViaVersion = false;
@@ -306,14 +304,14 @@ public class GeyserSpigotPlugin extends JavaPlugin implements GeyserBootstrap {
      */
     private boolean isViaVersionNeeded() {
         ProtocolVersion serverVersion = getServerProtocolVersion();
-        List<Pair<Integer, Protocol>> protocolList = ProtocolRegistry.getProtocolPath(MinecraftConstants.PROTOCOL_VERSION,
+        List<ProtocolPathEntry> protocolList = Via.getManager().getProtocolManager().getProtocolPath(MinecraftConstants.PROTOCOL_VERSION,
                 serverVersion.getVersion());
         if (protocolList == null) {
             // No translation needed!
             return false;
         }
         for (int i = protocolList.size() - 1; i >= 0; i--) {
-            MappingData mappingData = protocolList.get(i).getValue().getMappingData();
+            MappingData mappingData = protocolList.get(i).getProtocol().getMappingData();
             if (mappingData != null) {
                 return true;
             }
diff --git a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/GeyserSpigot1_11CraftingListener.java b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/GeyserSpigot1_11CraftingListener.java
index 2ee6457ac..04f236345 100644
--- a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/GeyserSpigot1_11CraftingListener.java
+++ b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/GeyserSpigot1_11CraftingListener.java
@@ -46,9 +46,9 @@ import org.geysermc.connector.network.session.GeyserSession;
 import org.geysermc.connector.network.translators.item.ItemTranslator;
 import org.geysermc.connector.network.translators.item.RecipeRegistry;
 import us.myles.ViaVersion.api.Pair;
+import us.myles.ViaVersion.api.Via;
 import us.myles.ViaVersion.api.data.MappingData;
-import us.myles.ViaVersion.api.protocol.Protocol;
-import us.myles.ViaVersion.api.protocol.ProtocolRegistry;
+import us.myles.ViaVersion.api.protocol.ProtocolPathEntry;
 import us.myles.ViaVersion.api.protocol.ProtocolVersion;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.Protocol1_13To1_12_2;
 
@@ -68,12 +68,12 @@ public class GeyserSpigot1_11CraftingListener implements Listener {
     /**
      * The list of all protocols from the client's version to 1.13.
      */
-    private final List<Pair<Integer, Protocol>> protocolList;
+    private final List<ProtocolPathEntry> protocolList;
 
     public GeyserSpigot1_11CraftingListener(GeyserConnector connector) {
         this.connector = connector;
-        this.mappingData1_12to1_13 = ProtocolRegistry.getProtocol(Protocol1_13To1_12_2.class).getMappingData();
-        this.protocolList = ProtocolRegistry.getProtocolPath(MinecraftConstants.PROTOCOL_VERSION,
+        this.mappingData1_12to1_13 = Via.getManager().getProtocolManager().getProtocol(Protocol1_13To1_12_2.class).getMappingData();
+        this.protocolList = Via.getManager().getProtocolManager().getProtocolPath(MinecraftConstants.PROTOCOL_VERSION,
                 ProtocolVersion.v1_13.getVersion());
     }
 
@@ -187,7 +187,7 @@ public class GeyserSpigot1_11CraftingListener implements Listener {
             }
 
             for (int i = protocolList.size() - 1; i >= 0; i--) {
-                MappingData mappingData = protocolList.get(i).getValue().getMappingData();
+                MappingData mappingData = protocolList.get(i).getProtocol().getMappingData();
                 if (mappingData != null) {
                     itemId = mappingData.getNewItemId(itemId);
                 }
diff --git a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigot1_12NativeWorldManager.java b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigot1_12NativeWorldManager.java
index 02347f5de..b09197fe0 100644
--- a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigot1_12NativeWorldManager.java
+++ b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigot1_12NativeWorldManager.java
@@ -54,7 +54,7 @@ public class GeyserSpigot1_12NativeWorldManager extends GeyserSpigot1_12WorldMan
             return BlockTranslator.JAVA_AIR_ID;
         }
         // Get block entity storage
-        BlockStorage storage = Via.getManager().getConnection(player.getUniqueId()).get(BlockStorage.class);
+        BlockStorage storage = Via.getManager().getConnectionManager().getConnectedClient(player.getUniqueId()).get(BlockStorage.class);
         int blockId = adapter.getBlockAt(player.getWorld(), x, y, z);
         return getLegacyBlock(storage, blockId, x, y, z);
     }
diff --git a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigot1_12WorldManager.java b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigot1_12WorldManager.java
index a28eef5b4..f91e9cc1c 100644
--- a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigot1_12WorldManager.java
+++ b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigot1_12WorldManager.java
@@ -33,12 +33,10 @@ import org.bukkit.entity.Player;
 import org.bukkit.plugin.Plugin;
 import org.geysermc.connector.network.session.GeyserSession;
 import org.geysermc.connector.network.translators.world.block.BlockTranslator;
-import us.myles.ViaVersion.api.Pair;
 import us.myles.ViaVersion.api.Via;
 import us.myles.ViaVersion.api.data.MappingData;
 import us.myles.ViaVersion.api.minecraft.Position;
-import us.myles.ViaVersion.api.protocol.Protocol;
-import us.myles.ViaVersion.api.protocol.ProtocolRegistry;
+import us.myles.ViaVersion.api.protocol.ProtocolPathEntry;
 import us.myles.ViaVersion.api.protocol.ProtocolVersion;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.Protocol1_13To1_12_2;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.storage.BlockStorage;
@@ -60,12 +58,12 @@ public class GeyserSpigot1_12WorldManager extends GeyserSpigotWorldManager {
     /**
      * The list of all protocols from the client's version to 1.13.
      */
-    private final List<Pair<Integer, Protocol>> protocolList;
+    private final List<ProtocolPathEntry> protocolList;
 
     public GeyserSpigot1_12WorldManager(Plugin plugin) {
         super(plugin, false);
-        this.mappingData1_12to1_13 = ProtocolRegistry.getProtocol(Protocol1_13To1_12_2.class).getMappingData();
-        this.protocolList = ProtocolRegistry.getProtocolPath(CLIENT_PROTOCOL_VERSION,
+        this.mappingData1_12to1_13 = Via.getManager().getProtocolManager().getProtocol(Protocol1_13To1_12_2.class).getMappingData();
+        this.protocolList = Via.getManager().getProtocolManager().getProtocolPath(CLIENT_PROTOCOL_VERSION,
                 ProtocolVersion.v1_13.getVersion());
     }
 
@@ -81,7 +79,7 @@ public class GeyserSpigot1_12WorldManager extends GeyserSpigotWorldManager {
             return BlockTranslator.JAVA_AIR_ID;
         }
         // Get block entity storage
-        BlockStorage storage = Via.getManager().getConnection(player.getUniqueId()).get(BlockStorage.class);
+        BlockStorage storage = Via.getManager().getConnectionManager().getConnectedClient(player.getUniqueId()).get(BlockStorage.class);
         Block block = player.getWorld().getBlockAt(x, y, z);
         // Black magic that gets the old block state ID
         int blockId = (block.getType().getId() << 4) | (block.getData() & 0xF);
@@ -109,7 +107,7 @@ public class GeyserSpigot1_12WorldManager extends GeyserSpigotWorldManager {
             }
         }
         for (int i = protocolList.size() - 1; i >= 0; i--) {
-            MappingData mappingData = protocolList.get(i).getValue().getMappingData();
+            MappingData mappingData = protocolList.get(i).getProtocol().getMappingData();
             if (mappingData != null) {
                 blockId = mappingData.getNewBlockStateId(blockId);
             }
@@ -126,7 +124,7 @@ public class GeyserSpigot1_12WorldManager extends GeyserSpigotWorldManager {
         }
         World world = player.getWorld();
         // Get block entity storage
-        BlockStorage storage = Via.getManager().getConnection(player.getUniqueId()).get(BlockStorage.class);
+        BlockStorage storage = Via.getManager().getConnectionManager().getConnectedClient(player.getUniqueId()).get(BlockStorage.class);
         for (int blockY = 0; blockY < 16; blockY++) { // Cache-friendly iteration order
             for (int blockZ = 0; blockZ < 16; blockZ++) {
                 for (int blockX = 0; blockX < 16; blockX++) {
diff --git a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigotLegacyNativeWorldManager.java b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigotLegacyNativeWorldManager.java
index 8f407de0a..9881020b1 100644
--- a/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigotLegacyNativeWorldManager.java
+++ b/bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/world/manager/GeyserSpigotLegacyNativeWorldManager.java
@@ -31,10 +31,9 @@ import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;
 import it.unimi.dsi.fastutil.ints.IntList;
 import org.geysermc.connector.network.session.GeyserSession;
 import org.geysermc.platform.spigot.GeyserSpigotPlugin;
-import us.myles.ViaVersion.api.Pair;
+import us.myles.ViaVersion.api.Via;
 import us.myles.ViaVersion.api.data.MappingData;
-import us.myles.ViaVersion.api.protocol.Protocol;
-import us.myles.ViaVersion.api.protocol.ProtocolRegistry;
+import us.myles.ViaVersion.api.protocol.ProtocolPathEntry;
 import us.myles.ViaVersion.api.protocol.ProtocolVersion;
 
 import java.util.List;
@@ -51,13 +50,13 @@ public class GeyserSpigotLegacyNativeWorldManager extends GeyserSpigotNativeWorl
         IntList allBlockStates = adapter.getAllBlockStates();
         oldToNewBlockId = new Int2IntOpenHashMap(allBlockStates.size());
         ProtocolVersion serverVersion = plugin.getServerProtocolVersion();
-        List<Pair<Integer, Protocol>> protocolList = ProtocolRegistry.getProtocolPath(MinecraftConstants.PROTOCOL_VERSION,
+        List<ProtocolPathEntry> protocolList = Via.getManager().getProtocolManager().getProtocolPath(MinecraftConstants.PROTOCOL_VERSION,
                 serverVersion.getVersion());
         for (int oldBlockId : allBlockStates) {
             int newBlockId = oldBlockId;
             // protocolList should *not* be null; we checked for that before initializing this class
             for (int i = protocolList.size() - 1; i >= 0; i--) {
-                MappingData mappingData = protocolList.get(i).getValue().getMappingData();
+                MappingData mappingData = protocolList.get(i).getProtocol().getMappingData();
                 if (mappingData != null) {
                     newBlockId = mappingData.getNewBlockStateId(newBlockId);
                 }
diff --git a/pom.xml b/pom.xml
index 4462c3f47..68a27d2f2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,10 +61,6 @@
                 <enabled>true</enabled>
             </snapshots>
         </repository>
-        <repository>
-            <id>viaversion-repo</id>
-            <url>https://repo.viaversion.com</url>
-        </repository>
         <repository>
             <id>sonatype</id>
             <url>https://oss.sonatype.org/content/repositories/snapshots/</url>