diff --git a/build.gradle.kts b/build.gradle.kts
index b9b7620..11dfb97 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -36,7 +36,7 @@ repositories {
 
 dependencies {
     // Paper
-    paperweight.paperDevBundle("1.21.1-R0.1-SNAPSHOT")
+    paperweight.paperDevBundle("1.21.8-R0.1-SNAPSHOT")
 
     // Gui library
     val inventoryFramework = "xyz.alexcrea.cuanvil.inventoryframework:IF-CustomAnvil:0.10.18.2"
diff --git a/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GuiTesterSelector.kt b/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GuiTesterSelector.kt
index 038c5db..0f18e44 100644
--- a/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GuiTesterSelector.kt
+++ b/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/gui/GuiTesterSelector.kt
@@ -11,11 +11,7 @@ object GuiTesterSelector {
 
             return when (versionParts[1]) {
                 21 -> when (versionParts[2]) {
-                    0, 1 -> "1_21_R1"
-                    2, 3 -> "1_21_R2"
-                    4 -> "1_21_R3"
-                    5 -> "1_21_R4"
-                    6, 7, 8 -> "1_21_R5"
+                    8 -> "1_21_R5"
                     else -> null
                 }
 
diff --git a/src/main/resources/plugin.yml b/src/main/resources/plugin.yml
index 0e58169..fc083a6 100644
--- a/src/main/resources/plugin.yml
+++ b/src/main/resources/plugin.yml
@@ -4,7 +4,7 @@ prefix: "Custom Anvil"
 version: ${version}
 folia-supported: true
 description: Allow to customise anvil mechanics
-api-version: 1.16
+api-version: 1.21.8
 load: POSTWORLD
 authors: [ DelilahEve, alexcrea ]
 libraries: [${libraries}]