diff --git a/versions/1.21.6/gradle.properties b/versions/1.21.6/gradle.properties
index 45a0a36..e3951b0 100644
--- a/versions/1.21.6/gradle.properties
+++ b/versions/1.21.6/gradle.properties
@@ -1,6 +1,4 @@
-# Builds against MC 1.21.9 (a stable point in the 1.21.6-1.21.11 range).
-# fabric.mod.json declares >=1.21.6 <1.22 so it loads on 1.21.6-1.21.11.
-minecraft_version=1.21.9
+minecraft_version=1.21.6
 loader_version=0.17.3
 java_version=21
 
@@ -10,6 +8,6 @@ loader_dep=>=0.16.10
 
 # Fabric API + ecosystem (compile-time versions for this variant; the launch
 # tests pin per-version runtime versions in supported-versions.json).
-fabric_api_version=0.134.0+1.21.9
+fabric_api_version=0.128.2+1.21.6
 modmenu_version=15.0.2
 cloth_config_version=19.0.147
diff --git a/versions/1.21/gradle.properties b/versions/1.21/gradle.properties
index 17a5ecb..c84e2bf 100644
--- a/versions/1.21/gradle.properties
+++ b/versions/1.21/gradle.properties
@@ -1,5 +1,3 @@
-# Builds against MC 1.21 itself (lowest in the 1.21-1.21.5 range, for max
-# backward compat). fabric.mod.json declares ~1.21 so it loads on 1.21-1.21.5.
 minecraft_version=1.21
 loader_version=0.17.3
 java_version=21