diff --git a/patches/server/Remap-reflection-calls-in-plugins-using-internals.patch b/patches/server/Remap-reflection-calls-in-plugins-using-internals.patch
index 8cdae74b74..64804bdbed 100644
--- a/patches/server/Remap-reflection-calls-in-plugins-using-internals.patch
+++ b/patches/server/Remap-reflection-calls-in-plugins-using-internals.patch
@@ -616,7 +616,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  @DefaultQualifier(NonNull.class)
  public final class MappingEnvironment {
 +    public static final boolean DISABLE_PLUGIN_REWRITING = Boolean.getBoolean("paper.disable-plugin-rewriting");
-+    public static final String LEGACY_CB_VERSION = "v1_20_R4";
++    public static final String LEGACY_CB_VERSION = "v1_21_R1";
      private static final @Nullable String MAPPINGS_HASH = readMappingsHash();
      private static final boolean REOBF = checkReobf();