Update for Paper 26.1.1

src/main/kotlin/creator/custom/TemplateDescriptor.kt

@@ -40,7 +40,7 @@ data class TemplateDescriptor(
 
     companion object {
 
-        const val FORMAT_VERSION = 2
+        const val FORMAT_VERSION = 3
     }
 }
 

src/main/kotlin/creator/custom/derivation/FetchPaperDependencyVersionForMcVersion.kt

@@ -0,0 +1,70 @@
+/*
+ * Minecraft Development for IntelliJ
+ *
+ * https://mcdev.io/
+ *
+ * Copyright (C) 2026 minecraft-dev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation, version 3.0 only.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.demonwav.mcdev.creator.custom.derivation
+
+import com.demonwav.mcdev.creator.custom.PropertyDerivation
+import com.demonwav.mcdev.creator.custom.TemplateValidationReporter
+import com.demonwav.mcdev.creator.custom.types.CreatorProperty
+import com.demonwav.mcdev.util.MinecraftVersions
+import com.demonwav.mcdev.util.SemanticVersion
+
+class FetchPaperDependencyVersionForMcVersion : PreparedDerivation {
+
+    override fun derive(parentValues: List<Any?>): Any {
+        val version = parentValues[0] as SemanticVersion
+        if (version < MinecraftVersions.MC_26_1) {
+            return "${version}-R0.1-SNAPSHOT";
+        }
+
+        val isMaven = (parentValues[1] as String) == "Maven"
+        return if (isMaven) {
+            "[${version}.build,)"
+        } else {
+            "${version}.build.+"
+        }
+    }
+
+    companion object : PropertyDerivationFactory {
+
+        override fun create(
+            reporter: TemplateValidationReporter,
+            parents: List<CreatorProperty<*>?>?,
+            derivation: PropertyDerivation
+        ): PreparedDerivation? {
+            if (parents.isNullOrEmpty()) {
+                reporter.error("Expected a parent")
+                return null
+            }
+
+            if (!parents[0]!!.acceptsType(SemanticVersion::class.java)) {
+                reporter.error("First parent must produce a semantic version")
+                return null
+            }
+
+            if (!parents[1]!!.acceptsType(String::class.java)) {
+                reporter.error("Second parent must produce a string")
+                return null
+            }
+
+            return FetchPaperDependencyVersionForMcVersion()
+        }
+    }
+}

src/main/kotlin/creator/custom/types/StringCreatorProperty.kt

@@ -25,6 +25,7 @@ import com.demonwav.mcdev.creator.custom.CreatorContext
 import com.demonwav.mcdev.creator.custom.PropertyDerivation
 import com.demonwav.mcdev.creator.custom.TemplatePropertyDescriptor
 import com.demonwav.mcdev.creator.custom.TemplateValidationReporter
+import com.demonwav.mcdev.creator.custom.derivation.FetchPaperDependencyVersionForMcVersion
 import com.demonwav.mcdev.creator.custom.derivation.PreparedDerivation
 import com.demonwav.mcdev.creator.custom.derivation.ReplacePropertyDerivation
 import com.demonwav.mcdev.creator.custom.derivation.SelectPropertyDerivation
@@ -73,6 +74,11 @@ class StringCreatorProperty(
             ReplacePropertyDerivation.create(reporter, parents, derives)
         }
 
+        "fetchPaperDependencyVersionForMcVersion" -> {
+            val parents = collectDerivationParents(reporter)
+            FetchPaperDependencyVersionForMcVersion.create(reporter, parents, derives)
+        }
+
         null -> {
             // No need to collect parent values for this one because it is not used
             SelectPropertyDerivation.create(reporter, emptyList(), derives)

src/main/kotlin/platform/mixin/util/MinecraftMissingLVTChecker.kt

@@ -32,7 +32,7 @@ class MinecraftMissingLVTChecker : MissingLVTChecker {
             !className.startsWith("net.minecraft.") && !className.startsWith("com.mojang.blaze3d.") -> false
             else -> {
                 val mcVersion = context.mcVersion
-                mcVersion != null && mcVersion <= MinecraftVersions.MC25_4
+                mcVersion != null && mcVersion <= MinecraftVersions.MC_1_21_11
             }
         }
     }

src/main/kotlin/util/MinecraftVersions.kt

@@ -46,13 +46,14 @@ object MinecraftVersions {
     val MC1_20_6 = SemanticVersion.release(1, 20, 6)
     val MC1_21 = SemanticVersion.release(1, 21)
     val MC1_21_1 = SemanticVersion.release(1, 21, 1)
-    val MC25_4 = SemanticVersion.release(25, 4) // placeholder till we know what the last 2025 winter drop version is
+    val MC_1_21_11 = SemanticVersion.release(1, 21, 11)
+    val MC_26_1 = SemanticVersion.release(26, 1)
 
     fun requiredJavaVersion(minecraftVersion: SemanticVersion) = when {
         minecraftVersion <= MC1_16_5 -> JavaSdkVersion.JDK_1_8
         minecraftVersion <= MC1_17_1 -> JavaSdkVersion.JDK_16
         minecraftVersion <= MC1_20_4 -> JavaSdkVersion.JDK_17
-        minecraftVersion<= MC25_4 -> JavaSdkVersion.JDK_21
+        minecraftVersion <= MC_1_21_11 -> JavaSdkVersion.JDK_21
         else -> JavaSdkVersion.JDK_25
     }
 }