diff --git a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/assets/MinecraftAssetsProvider.java b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/assets/MinecraftAssetsProvider.java
index b191343..da349e7 100644
--- a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/assets/MinecraftAssetsProvider.java
+++ b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/assets/MinecraftAssetsProvider.java
@@ -30,8 +30,8 @@ import java.io.FileWriter;
 import java.io.IOException;
 import java.net.URL;
 import java.util.Deque;
-import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -89,7 +89,7 @@ public class MinecraftAssetsProvider {
 		}
 
 		Gson gson = new Gson();
-		Map<String, String> checksumInfos = new HashMap<>();
+		Map<String, String> checksumInfos = new ConcurrentHashMap<>();
 
 		if (checksumInfo.exists()) {
 			try (FileReader reader = new FileReader(checksumInfo)) {