diff --git a/common/src/main/java/org/screamingsandals/nms/generator/build/AccessorClassGenerator.java b/common/src/main/java/org/screamingsandals/nms/generator/build/AccessorClassGenerator.java
index 427ec27e4f6..7f4cc408c5a 100644
--- a/common/src/main/java/org/screamingsandals/nms/generator/build/AccessorClassGenerator.java
+++ b/common/src/main/java/org/screamingsandals/nms/generator/build/AccessorClassGenerator.java
@@ -147,8 +147,8 @@ public void run() throws IOException {
                     name += "_" + counter;
                 }
                 counter++;
-            } while (takenAccessorNames.contains(name));
-            takenAccessorNames.add(name);
+            } while (takenAccessorNames.contains(name.toLowerCase(Locale.ROOT)));
+            takenAccessorNames.add(name.toLowerCase(Locale.ROOT));
 
             var builder = TypeSpec.classBuilder(name)
                     .addModifiers(Modifier.PUBLIC);
diff --git a/config/1.20.3/info.json b/config/1.20.3/info.json
index bd6f99b76f0..b29aa1eef4d 100644
--- a/config/1.20.3/info.json
+++ b/config/1.20.3/info.json
@@ -28,7 +28,7 @@
     "sha1": "c7d91f09341e593051211a99b37f6991d678f25d"
   },
   "quilt-mappings": {
-    "url": "https://maven.quiltmc.org/repository/release/org/quiltmc/quilt-mappings/1.20.3+build.1/quilt-mappings-1.20.3+build.1-v2.jar",
-    "sha1": "ee6946b6b971452981506660ea9b200bd716569a"
+    "url": "https://maven.quiltmc.org/repository/release/org/quiltmc/quilt-mappings/1.20.3+build.3/quilt-mappings-1.20.3+build.3-v2.jar",
+    "sha1": "003f51bb442df184f8ec6fada344c3fcc41182de"
   }
 }
diff --git a/config/1.20.4/info.json b/config/1.20.4/info.json
new file mode 100644
index 00000000000..6ecb0b081b8
--- /dev/null
+++ b/config/1.20.4/info.json
@@ -0,0 +1,34 @@
+{
+  "version": "1.20.4",
+  "spigot-nms-version": "1_20_R3",
+  "vanilla-jar": {
+    "url": "https://piston-data.mojang.com/v1/objects/8dd1a28015f51b1803213892b50b7b4fc76e594d/server.jar",
+    "sha1": "8dd1a28015f51b1803213892b50b7b4fc76e594d"
+  },
+  "mojang-mappings": {
+    "url": "https://piston-data.mojang.com/v1/objects/c1cafe916dd8b58ed1fe0564fc8f786885224e62/server.txt",
+    "sha1": "c1cafe916dd8b58ed1fe0564fc8f786885224e62"
+  },
+  "searge-mappings": {
+    "url": "https://maven.minecraftforge.net/de/oceanlabs/mcp/mcp_config/1.20.4/mcp_config-1.20.4.zip",
+    "sha1": "55d51be7dba2ea898d2213e4312f29f76a8788c6"
+  },
+  "spigot-class-mappings": {
+    "url": "https://hub.spigotmc.org/stash/projects/SPIGOT/repos/builddata/raw/mappings/bukkit-1.20.4-cl.csrg?at=17eb87e5cd509ff55d691b74902ac19c3b62ca0c"
+  },
+  "intermediary-mappings": {
+    "url": "https://raw.githubusercontent.com/FabricMC/intermediary/master/mappings/1.20.4.tiny"
+  },
+  "yarn-mappings": {
+    "url": "https://maven.fabricmc.net/net/fabricmc/yarn/1.20.4%2Bbuild.3/yarn-1.20.4%2Bbuild.3-v2.jar",
+    "sha1": "49856680152d7975434216c30364bb50412cc1fd"
+  },
+  "hashed-quilt-mappings": {
+    "url": "https://maven.quiltmc.org/repository/release/org/quiltmc/hashed/1.20.4/hashed-1.20.4.tiny",
+    "sha1": "c7d91f09341e593051211a99b37f6991d678f25d"
+  },
+  "quilt-mappings": {
+    "url": "https://maven.quiltmc.org/repository/release/org/quiltmc/quilt-mappings/1.20.4+build.3/quilt-mappings-1.20.4+build.3-v2.jar",
+    "sha1": "43194c29dc0606078f7eeda936945a27dad05acd"
+  }
+}
diff --git a/gradle.properties b/gradle.properties
index 58f0c407703..07116aef6e9 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 group=org.screamingsandals.nms
-version=1.4.8
+version=1.4.9
 
 # Gradle properties
 org.gradle.jvmargs=-Xmx2048M