diff --git a/build.gradle b/build.gradle
index 9ce4280..2ec29d4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -26,7 +26,7 @@ base {
 }
 
 java {
-    toolchain.languageVersion = JavaLanguageVersion.of(17)
+    toolchain.languageVersion = JavaLanguageVersion.of(8)
 }
 
 minecraft {
diff --git a/gradle.properties b/gradle.properties
index 616e000..e420cdc 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -9,12 +9,12 @@ mod_group_id=dev.micle
 mod_authors=Micle
 mod_description=Firefly bush backport from 1.21.5.
 
-minecraft_version=1.20.1
-minecraft_version_range=[1.20.1,1.21)
+minecraft_version=1.16.5
+minecraft_version_range=[1.16.5,1.17)
 
-forge_version=47.4.0
-forge_version_range=[47,)
-loader_version_range=[47,)
+forge_version=36.2.42
+forge_version_range=[36,)
+loader_version_range=[36,)
 
 mapping_channel=parchment
-mapping_version=2023.09.03
+mapping_version=2022.03.06