diff --git a/api/build.gradle b/api/build.gradle
index c46a2360c..758a9eb30 100644
--- a/api/build.gradle
+++ b/api/build.gradle
@@ -59,6 +59,7 @@ artifacts {
 javadoc {
     options.encoding = 'UTF-8'
     options.charSet = 'UTF-8'
+    options.source = '8'
     options.links(
             'http://www.slf4j.org/apidocs/',
             'https://google.github.io/guava/releases/25.1-jre/api/docs/',
diff --git a/proxy/build.gradle b/proxy/build.gradle
index 54ddc7b86..b4a59f90d 100644
--- a/proxy/build.gradle
+++ b/proxy/build.gradle
@@ -64,7 +64,7 @@ dependencies {
     compile 'it.unimi.dsi:fastutil:8.2.2'
     compile 'net.kyori:event-method-asm:3.0.0'
 
-    compile 'com.mojang:brigadier:1.0.15'
+    compile 'com.mojang:brigadier:1.0.17'
 
     testCompile "org.junit.jupiter:junit-jupiter-api:${junitVersion}"
     testCompile "org.junit.jupiter:junit-jupiter-engine:${junitVersion}"
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/ArgumentPropertyRegistry.java b/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/ArgumentPropertyRegistry.java
index 9560a8b29..e7847ec8e 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/ArgumentPropertyRegistry.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/ArgumentPropertyRegistry.java
@@ -4,6 +4,7 @@ import static com.velocitypowered.proxy.protocol.packet.brigadier.DoubleArgument
 import static com.velocitypowered.proxy.protocol.packet.brigadier.DummyVoidArgumentPropertySerializer.DUMMY;
 import static com.velocitypowered.proxy.protocol.packet.brigadier.FloatArgumentPropertySerializer.FLOAT;
 import static com.velocitypowered.proxy.protocol.packet.brigadier.IntegerArgumentPropertySerializer.INTEGER;
+import static com.velocitypowered.proxy.protocol.packet.brigadier.LongArgumentPropertySerializer.LONG;
 import static com.velocitypowered.proxy.protocol.packet.brigadier.StringArgumentPropertySerializer.STRING;
 
 import com.mojang.brigadier.arguments.ArgumentType;
@@ -11,6 +12,7 @@ import com.mojang.brigadier.arguments.BoolArgumentType;
 import com.mojang.brigadier.arguments.DoubleArgumentType;
 import com.mojang.brigadier.arguments.FloatArgumentType;
 import com.mojang.brigadier.arguments.IntegerArgumentType;
+import com.mojang.brigadier.arguments.LongArgumentType;
 import com.mojang.brigadier.arguments.StringArgumentType;
 import com.velocitypowered.proxy.protocol.ProtocolUtils;
 import io.netty.buffer.ByteBuf;
@@ -90,6 +92,7 @@ public class ArgumentPropertyRegistry {
     register("brigadier:double", DoubleArgumentType.class, DOUBLE);
     register("brigadier:bool", BoolArgumentType.class,
         VoidArgumentPropertySerializer.create(BoolArgumentType::bool));
+    register("brigadier:long", LongArgumentType.class, LONG);
 
     // Minecraft argument types with extra properties
     dummy("minecraft:entity", ByteArgumentPropertySerializer.BYTE);
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/DummyProperty.java b/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/DummyProperty.java
index 762b52686..9b514f903 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/DummyProperty.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/DummyProperty.java
@@ -17,11 +17,6 @@ class DummyProperty<T> implements ArgumentType<T> {
     this.result = result;
   }
 
-  @Override
-  public <S> T parse(StringReader reader) throws CommandSyntaxException {
-    throw new UnsupportedOperationException();
-  }
-
   public String getIdentifier() {
     return identifier;
   }
@@ -33,4 +28,9 @@ class DummyProperty<T> implements ArgumentType<T> {
   public @Nullable T getResult() {
     return result;
   }
+
+  @Override
+  public T parse(StringReader reader) {
+    throw new UnsupportedOperationException();
+  }
 }
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/LongArgumentPropertySerializer.java b/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/LongArgumentPropertySerializer.java
new file mode 100644
index 000000000..9d3b40b6d
--- /dev/null
+++ b/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/LongArgumentPropertySerializer.java
@@ -0,0 +1,40 @@
+package com.velocitypowered.proxy.protocol.packet.brigadier;
+
+import static com.velocitypowered.proxy.protocol.packet.brigadier.IntegerArgumentPropertySerializer.HAS_MAXIMUM;
+import static com.velocitypowered.proxy.protocol.packet.brigadier.IntegerArgumentPropertySerializer.HAS_MINIMUM;
+import static com.velocitypowered.proxy.protocol.packet.brigadier.IntegerArgumentPropertySerializer.getFlags;
+
+import com.mojang.brigadier.arguments.LongArgumentType;
+import io.netty.buffer.ByteBuf;
+
+class LongArgumentPropertySerializer implements ArgumentPropertySerializer<LongArgumentType> {
+
+  static final LongArgumentPropertySerializer LONG = new LongArgumentPropertySerializer();
+
+  private LongArgumentPropertySerializer() {
+
+  }
+
+  @Override
+  public LongArgumentType deserialize(ByteBuf buf) {
+    byte flags = buf.readByte();
+    long minimum = (flags & HAS_MINIMUM) != 0 ? buf.readLong() : Long.MIN_VALUE;
+    long maximum = (flags & HAS_MAXIMUM) != 0 ? buf.readLong() : Long.MAX_VALUE;
+    return LongArgumentType.longArg(minimum, maximum);
+  }
+
+  @Override
+  public void serialize(LongArgumentType object, ByteBuf buf) {
+    boolean hasMinimum = object.getMinimum() != Long.MIN_VALUE;
+    boolean hasMaximum = object.getMaximum() != Long.MAX_VALUE;
+    byte flag = getFlags(hasMinimum, hasMaximum);
+
+    buf.writeByte(flag);
+    if (hasMinimum) {
+      buf.writeLong(object.getMinimum());
+    }
+    if (hasMaximum) {
+      buf.writeLong(object.getMaximum());
+    }
+  }
+}