diff --git a/build.gradle.kts b/build.gradle.kts
index 3f5f03d..fd6afe9 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -10,11 +10,11 @@ allprojects { group = "io.gitlab.jfronny" }
 base.archivesName = "slyde"
 
 jfMod {
-    minecraftVersion = "1.20.5"
+    minecraftVersion = "1.21"
     yarn("build.1")
-    loaderVersion = "0.15.10"
-    libJfVersion = "3.15.2"
-    fabricApiVersion = "0.97.6+1.20.5"
+    loaderVersion = "0.15.11"
+    libJfVersion = "3.16.0"
+    fabricApiVersion = "0.100.1+1.21"
 
     modrinth {
         projectId = "slyde"
@@ -33,7 +33,7 @@ repositories {
 }
 
 dependencies {
-    modCompileOnly("maven.modrinth:sodium:mc1.20.5-0.5.8")
+    modCompileOnly("maven.modrinth:sodium:mc1.21-0.5.9")
 
     modImplementation("io.gitlab.jfronny.libjf:libjf-config-core-v2")
 
@@ -41,5 +41,5 @@ dependencies {
     modLocalRuntime("net.fabricmc.fabric-api:fabric-api")
     modLocalRuntime("io.gitlab.jfronny.libjf:libjf-devutil")
     modLocalRuntime("io.gitlab.jfronny.libjf:libjf-config-ui-tiny")
-    modLocalRuntime("com.terraformersmc:modmenu:10.0.0-beta.1")
+    modLocalRuntime("com.terraformersmc:modmenu:11.0.0-beta.1")
 }
diff --git a/src/client/java/io/gitlab/jfronny/slyde/mixin/IntSliderCallbackMixin.java b/src/client/java/io/gitlab/jfronny/slyde/mixin/IntSliderCallbackMixin.java
new file mode 100644
index 0000000..35fbea7
--- /dev/null
+++ b/src/client/java/io/gitlab/jfronny/slyde/mixin/IntSliderCallbackMixin.java
@@ -0,0 +1,26 @@
+package io.gitlab.jfronny.slyde.mixin;
+
+import net.minecraft.client.option.SimpleOption;
+import net.minecraft.util.math.MathHelper;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(targets = "net.minecraft.client.option.SimpleOption$IntSliderCallbacks")
+public interface IntSliderCallbackMixin extends SimpleOption.SliderCallbacks<Integer> {
+    @Shadow int minInclusive();
+    @Shadow int maxInclusive();
+
+    /**
+     * @author JFronny
+     * @reason prevent toValue from limiting us to the upper bound
+     */
+    @Override
+    @Overwrite
+    default Integer toValue(double sliderProgress) {
+        if (sliderProgress >= 1.0 && sliderProgress < 1.00001f) {
+            sliderProgress = 0.99999f;
+        }
+        return MathHelper.floor(MathHelper.map(sliderProgress, 0.0, 1.0, this.minInclusive(), this.maxInclusive() + 1.0));
+    }
+}
diff --git a/src/client/resources/slyde.mixins.json b/src/client/resources/slyde.mixins.json
index 1289192..28c1804 100644
--- a/src/client/resources/slyde.mixins.json
+++ b/src/client/resources/slyde.mixins.json
@@ -8,6 +8,7 @@
     "CodecMixin",
     "DoubleSliderCallbacksMixin",
     "GameOptionsMixin",
+    "IntSliderCallbackMixin",
     "SliderWidgetMixin",
     "SodiumSliderControlMixin",
     "ValidatingIntSliderCallbacksMixin"