Fix

.github/workflows/daedalus-run.yml

@@ -22,7 +22,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Pull Docker image from GHCR
-        run: docker pull ghcr.io/modrinth/daedalus:main
+        run: docker pull ghcr.io/modrinth/daedalus:fetch-fix-daedalus
 
       - name: Run Docker container
         env:
@@ -48,4 +48,4 @@ jobs:
             -e CLOUDFLARE_INTEGRATION=$CLOUDFLARE_INTEGRATION \
             -e CLOUDFLARE_TOKEN=$CLOUDFLARE_TOKEN \
             -e CLOUDFLARE_ZONE_ID=$CLOUDFLARE_ZONE_ID \
-            ghcr.io/modrinth/daedalus:main
+            ghcr.io/modrinth/daedalus:fetch-fix-daedalus

apps/daedalus_client/src/error.rs

@@ -33,6 +33,8 @@ pub enum ErrorKind {
     Tracing(#[from] tracing::subscriber::SetGlobalDefaultError),
     #[error("Zip error: {0}")]
     Zip(#[from] async_zip::error::ZipError),
+    #[error("Failed to parse an integer: {0}")]
+    ParseIntError(#[from] std::num::ParseIntError),
 }
 
 #[derive(Debug)]

apps/daedalus_client/src/forge.rs

@@ -145,9 +145,16 @@ pub async fn fetch_neo(
     }).chain(neo_versions.versioning.versions.version.into_iter().map(|loader_version| {
         let mut parts = loader_version.split('.');
 
-        // NeoForge Forge versions are in this format: 20.2.29-beta, 20.6.119
-        // Where the first number is the major MC version, the second is the minor MC version, and the third is the NeoForge version
-        let major = parts.next().ok_or_else(
+        // NeoForge Forge versions are in either of these formats:
+		// - 20.2.29-beta, 20.6.119
+		// - 26.1.0.10-beta, 26.1.0.16
+        //
+		// The first format is the "modern" format for Minecraft versions starting with 1, where the first number is the major MC version,
+		// the second is the minor MC version, and the third is the NeoForge version.
+		//
+		// The second format is the "new-modern" format for Minecraft versions in year-based format, where the first three numbers
+		// are the Minecraft version (year.release.hotfix), and the fourth, the NeoForge release version, with an optional "beta" suffix.
+        let major_or_year = parts.next().ok_or_else(
             || crate::ErrorKind::InvalidInput(format!("Unable to find major game version for NeoForge {loader_version}"))
         )?;
 
@@ -155,11 +162,24 @@ pub async fn fetch_neo(
             || crate::ErrorKind::InvalidInput(format!("Unable to find minor game version for NeoForge {loader_version}"))
         )?;
 
-        let game_version = if minor == "0" {
-            format!("1.{major}")
-        } else {
-            format!("1.{major}.{minor}")
-        };
+		let major_or_year = major_or_year.parse::<u32>()?;
+
+		// Year-based MC versions started in 2026
+		let game_version = match major_or_year {
+			26.. => {
+				let hotfix = parts.next().ok_or_else(
+					|| crate::ErrorKind::InvalidInput(format!("Unable to find hotfix version for NeoForge {loader_version}"))
+				)?;
+
+				if hotfix == "0" {
+					format!("{major_or_year}.{minor}")
+				} else {
+					format!("{major_or_year}.{minor}.{hotfix}")
+				}
+			}
+			..26 if minor == "0" => format!("1.{major_or_year}"),
+			..26 => format!("1.{major_or_year}.{minor}"),
+		};
 
         Ok(ForgeVersion {
             format_version: 2,

packages/daedalus/src/minecraft.rs

@@ -454,6 +454,7 @@ pub enum Argument {
     /// An argument which is only applied if certain conditions are met
     Ruled {
         /// The rules deciding whether the argument(s) is used or not
+        #[serde(default)]
         rules: Vec<Rule>,
         /// The container of the argument(s) that should be applied accordingly
         value: ArgumentValue,
@@ -461,13 +462,15 @@ pub enum Argument {
 }
 
 #[derive(Serialize, Deserialize, Debug, Eq, PartialEq, Hash, Clone, Copy)]
-#[serde(rename_all = "snake_case")]
+#[serde(rename_all = "kebab-case")]
 /// The type of argument
 pub enum ArgumentType {
     /// The argument is passed to the game
     Game,
     /// The argument is passed to the JVM
     Jvm,
+    /// Passed to JVM as well. Includes default arguments to the GC.
+    DefaultUserJvm,
 }
 
 #[derive(Serialize, Deserialize, Debug, Eq, PartialEq, Hash)]