1.20.6 doesn't require any change (apparently)

build.gradle

@@ -1,7 +1,7 @@
 plugins {
     id "com.github.johnrengelman.shadow" version "8.1.1" apply false
     id "architectury-plugin" version "3.4-SNAPSHOT"
-    id "dev.architectury.loom" version "1.4-SNAPSHOT" apply false
+    id "dev.architectury.loom" version "1.6-SNAPSHOT" apply false
 }
 
 architectury {
@@ -30,7 +30,10 @@ subprojects {
         // The following line declares the mojmap mappings, you may use other mappings as well
         // mappings loom.officialMojangMappings()
         // The following line declares the yarn mappings you may select this one as well.
-        mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
+        mappings loom.layered {
+            it.mappings("net.fabricmc:yarn:${project.yarn_mappings}:v2")
+            it.mappings("dev.architectury:yarn-mappings-patch-neoforge:$rootProject.yarn_forge_patch")
+        }
     }
 }
 
@@ -55,7 +58,7 @@ allprojects {
 
     tasks.withType(JavaCompile) {
         options.encoding = "UTF-8"
-        options.release.set 17
+        options.release.set 21
     }
 
     java {

gradle.properties

@@ -4,12 +4,13 @@ mod_version=4.1.0
 maven_group=io.github.kosmx.bendy-lib
 archives_base_name=bendy-lib
 
-minecraft_version=1.20.4
-yarn_mappings=1.20.4+build.3
-loader_version=0.15.3
+minecraft_version=1.20.6
+yarn_mappings=1.20.6+build.3
+yarn_forge_patch=1.20.5+build.3
+loader_version=0.15.11
 
 #Fabric api
-fabric_version=0.93.1+1.20.4
+fabric_version=0.100.0+1.20.6
 
 #Forge thingy
-forge_version=20.4.89-beta
+forge_version=20.6.117

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME