diff --git a/gradle.properties b/gradle.properties
index d7d028b..04d6c7b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -4,17 +4,17 @@ org.gradle.parallel=true
 
 # Fabric Properties
 # check these on https://fabricmc.net/develop
-minecraft_version=1.21-pre1
-yarn_build=3
+minecraft_version=1.21
+yarn_build=7
 loader_version=0.15.11
 
 # Mod Properties
-mod_version=1.5.1
+mod_version=1.5.2
 maven_group=net.mcbrawls
 mod_id=blueprint
 
 # Dependencies
-fabric_version=0.99.2+1.21
+fabric_version=0.100.4+1.21
 
 kotlin_version=1.9.24
 fabric_kotlin_version=1.10.20+kotlin.1.9.24
diff --git a/src/main/kotlin/net/mcbrawls/blueprint/structure/Blueprint.kt b/src/main/kotlin/net/mcbrawls/blueprint/structure/Blueprint.kt
index 20c7d14..57193fc 100644
--- a/src/main/kotlin/net/mcbrawls/blueprint/structure/Blueprint.kt
+++ b/src/main/kotlin/net/mcbrawls/blueprint/structure/Blueprint.kt
@@ -67,7 +67,10 @@ data class Blueprint(
         val future: CompletableFuture<PlacedBlueprint> = CompletableFuture.supplyAsync {
             var i = 0
             forEach { offset, state ->
-                world.setBlockState(position.add(offset), state)
+                synchronized(world) {
+                    world.setBlockState(position.add(offset), state)
+                }
+
                 i++
             }