diff --git a/.github/maven-release/README.md b/.github/maven-release/README.md
index a809886..79d7cc2 100644
--- a/.github/maven-release/README.md
+++ b/.github/maven-release/README.md
@@ -13,9 +13,9 @@ If CurseForge has accepted the file but it isn't public yet, wait for approval.
 Start a new run with the recorded CurseForge file ID so it verifies that upload
 without submitting the jar again. The release workflow sets Java 8 through
 Minecraft 1.16.5, Java 16 for Minecraft 1.17.1, and Java 17 for Minecraft 1.18.2
-through 1.20.1.
+through 1.20.1, and Java 21 for Minecraft 1.20.6 and 1.21.1.
 
-For Minecraft 1.20.1, check that basePower and Base Metals have public files
+Before publishing, check that basePower and Base Metals have public files
 before publishing. Use the release's required dependency relations on CurseForge.
 
 ## Existing CurseForge releases
diff --git a/.github/maven-release/releases.json b/.github/maven-release/releases.json
index 235c490..e49406a 100644
--- a/.github/maven-release/releases.json
+++ b/.github/maven-release/releases.json
@@ -97,6 +97,15 @@
       "archiveSha256": "7030f7c4672015c5b1a2f28a037e4493a0e05d567e2dc65fdb179f6f521cb0b6",
       "mainSha256": "248f87f7731472025c73f766f7b634268ac38cc987c4ca41e4743c229d54b80e"
     },
+    "2.2.15.121011": {
+      "branch": "master-1.21.1",
+      "commit": "b145f8d1a7c2a148f8f259faec7b203cf146b6b5",
+      "tag": "2.2.15.121011",
+      "runId": 43051758177,
+      "artifactId": 13869666477,
+      "archiveSha256": "7b7ddfc9d22def525aee024cce64a8863947c3ae0e061338d51beaaecbf0e2fd",
+      "mainSha256": "ea305b9060bc2a84021c7299249aa79aa593ea8a37665c18d0b3483902f1046a"
+    },
     "2.2.14.120061": {
       "branch": "master-1.20.6",
       "commit": "eb48cccc52d07ce3ae9cedca49216c788c2fb735",
diff --git a/.github/workflows/deploy-release.yml b/.github/workflows/deploy-release.yml
index dec805a..ff27370 100644
--- a/.github/workflows/deploy-release.yml
+++ b/.github/workflows/deploy-release.yml
@@ -74,7 +74,7 @@ jobs:
             1.10.2|1.12.2|1.13.2|1.14.4|1.15.2|1.16.5) java="Java 8" ;;
             1.17.1) java="Java 16" ;;
             1.18.2|1.19.4|1.20.1) java="Java 17" ;;
-            1.20.6) java="Java 21" ;;
+            1.20.6|1.21.1) java="Java 21" ;;
             *) echo "Unsupported Minecraft version for this publisher: $mc" >&2; exit 1 ;;
           esac
           echo "minecraft=$mc" >> "$GITHUB_OUTPUT"