diff --git a/src/main/java/net/coderbot/iris/compat/sodium/SodiumVersionCheck.java b/src/main/java/net/coderbot/iris/compat/sodium/SodiumVersionCheck.java
index b7cf83d6bf..4a45ea4870 100644
--- a/src/main/java/net/coderbot/iris/compat/sodium/SodiumVersionCheck.java
+++ b/src/main/java/net/coderbot/iris/compat/sodium/SodiumVersionCheck.java
@@ -13,8 +13,8 @@ public class SodiumVersionCheck {
 	// of pain. So don't forget!
 	private static final ImmutableList<AllowedSodiumVersion> ALLOWED_SODIUM_VERSIONS = ImmutableList.of(
 			// Dev version
-		AllowedSodiumVersion.exact("0.4.10+build.27",
-					"https://modrinth.com/mod/sodium/version/mc1.20-0.4.10")
+		AllowedSodiumVersion.exact("0.5.0-rc1",
+					"https://modrinth.com/mod/sodium/version/mc1.20.1-0.5.0")
 	);
 
 	public static String getDownloadLink() {
@@ -29,6 +29,6 @@ public static boolean isAllowedVersion(String sodiumVersion) {
 			}
 		}
 
-		return true;
+		return false;
 	}
 }
diff --git a/src/main/resources/fabric.mod.json b/src/main/resources/fabric.mod.json
index 3ec7b8deae..fe6d6e8545 100644
--- a/src/main/resources/fabric.mod.json
+++ b/src/main/resources/fabric.mod.json
@@ -1,7 +1,7 @@
 {
   "schemaVersion": 1,
   "id": "iris",
-  "version": "1.6.4-development-environment",
+  "version": "1.6.5-beta.1-development-environment",
 
   "name": "Iris",
   "description": "A modern shaders mod for Minecraft intended to be compatible with existing OptiFine shader packs",
diff --git a/src/sodiumCompatibility/java/net/coderbot/iris/compat/sodium/mixin/shadow_map/frustum/MixinBoxCullingFrustum.java b/src/sodiumCompatibility/java/net/coderbot/iris/compat/sodium/mixin/shadow_map/frustum/MixinBoxCullingFrustum.java
index 8da548541d..fbc1b0bee0 100644
--- a/src/sodiumCompatibility/java/net/coderbot/iris/compat/sodium/mixin/shadow_map/frustum/MixinBoxCullingFrustum.java
+++ b/src/sodiumCompatibility/java/net/coderbot/iris/compat/sodium/mixin/shadow_map/frustum/MixinBoxCullingFrustum.java
@@ -26,6 +26,6 @@ public class MixinBoxCullingFrustum implements IrisFrustum, ViewportProvider {
 
 	@Override
 	public boolean apply(double minX, double minY, double minZ, double maxX, double maxY, double maxZ) {
-		return boxCuller.isCulled(minX, minY, minZ, maxX, maxY, maxZ);
+		return !boxCuller.isCulled(minX, minY, minZ, maxX, maxY, maxZ);
 	}
 }