diff --git a/common/src/main/java/com/viaversion/viaversion/protocol/ProtocolPipelineImpl.java b/common/src/main/java/com/viaversion/viaversion/protocol/ProtocolPipelineImpl.java
index 5ea989e43..c86804c23 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocol/ProtocolPipelineImpl.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocol/ProtocolPipelineImpl.java
@@ -53,7 +53,7 @@ public class ProtocolPipelineImpl extends AbstractSimpleProtocol implements Prot
     }
 
     @Override
-    protected void registerPackets() {
+    protected synchronized void registerPackets() {
         // This is a pipeline so we register basic pipes
         final Protocol<?, ?, ?, ?> baseProtocol = Via.getManager().getProtocolManager().getBaseProtocol();
         protocolList.add(baseProtocol);
@@ -177,7 +177,7 @@ public class ProtocolPipelineImpl extends AbstractSimpleProtocol implements Prot
     }
 
     @Override
-    public void cleanPipes() {
+    public synchronized void cleanPipes() {
         protocolList.clear();
         reversedProtocolList.clear();
         protocolSet.clear();
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index f625c04c7..e7f1c874a 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -4,7 +4,7 @@ metadata.format.version = "1.1"
 
 adventure = "4.14.0"
 gson = "2.10.1"
-fastutil = "8.5.13"
+fastutil = "8.5.12"
 flare = "2.0.1"
 vianbt = "3.2.0"