diff --git a/fmlloader/src/main/java/net/minecraftforge/fml/loading/VersionSupportMatrix.java b/fmlloader/src/main/java/net/minecraftforge/fml/loading/VersionSupportMatrix.java
index ca833822d7..7d118b9535 100644
--- a/fmlloader/src/main/java/net/minecraftforge/fml/loading/VersionSupportMatrix.java
+++ b/fmlloader/src/main/java/net/minecraftforge/fml/loading/VersionSupportMatrix.java
@@ -19,11 +19,11 @@ public class VersionSupportMatrix {
     private static final HashMap<String, List<ArtifactVersion>> overrideVersions = new HashMap<>();
     static {
          final ArtifactVersion version = new DefaultArtifactVersion(FMLLoader.versionInfo().mcVersion());
-         if (MavenVersionAdapter.createFromVersionSpec("[1.19.2]").containsVersion(version)) {
-             // 1.19.2 is Compatible with 1.19.1
-             add("languageloader.javafml", "42");
-             add("mod.minecraft",          "1.19.1");
-             add("mod.forge",              "42.0.9");
+         if (MavenVersionAdapter.createFromVersionSpec("[1.21.1]").containsVersion(version)) {
+             // 1.21.1 is Compatible with 1.21
+             add("languageloader.javafml", "51");
+             add("mod.minecraft",          "1.21");
+             add("mod.forge",              "51.0.33");
         }
     }
     private static void add(String key, String value) {
diff --git a/gradle.properties b/gradle.properties
index 1b54f1f1b3..e1e07d657b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -14,4 +14,4 @@ MAPPING_VERSION=1.21.1
 // Set to true before the first build of a new MC version, so we don't do compatibility checks
 CHECK_COMPATIBILITY=false
 // Set to true to allow for fuzzy patching. Useful during updateing
-UPDATING=true
\ No newline at end of file
+UPDATING=false
\ No newline at end of file