diff --git a/.gitignore b/.gitignore
index 823aca8..7b75302 100755
--- a/.gitignore
+++ b/.gitignore
@@ -22,4 +22,5 @@ bin/
 
 # fabric
 
-run/
\ No newline at end of file
+run/
+/.architectury-transformer
diff --git a/common/build.gradle b/common/build.gradle
index ff55c16..6c5bcb8 100644
--- a/common/build.gradle
+++ b/common/build.gradle
@@ -7,7 +7,7 @@ dependencies {
     // Do NOT use other classes from fabric loader
     modImplementation "net.fabricmc:fabric-loader:${rootProject.fabric_loader_version}"
     modCompileOnlyApi "maven.modrinth:midnightlib:${rootProject.midnightlib_version}-fabric"
-    //modCompileOnly "maven.modrinth:iris:${project.iris_version}"
+    modCompileOnly "maven.modrinth:iris:${project.iris_version}"
 }
 
 publishing {
diff --git a/common/src/main/java/eu/midnightdust/picturesign/util/IrisCompat.java b/common/src/main/java/eu/midnightdust/picturesign/util/IrisCompat.java
index 06b28fe..cb4aa0d 100644
--- a/common/src/main/java/eu/midnightdust/picturesign/util/IrisCompat.java
+++ b/common/src/main/java/eu/midnightdust/picturesign/util/IrisCompat.java
@@ -1,9 +1,9 @@
 package eu.midnightdust.picturesign.util;
 
-//import net.irisshaders.iris.api.v0.IrisApi;
+import net.irisshaders.iris.api.v0.IrisApi;
 
 public class IrisCompat {
     public static boolean isShaderPackInUse() {
-        return false;//IrisApi.getInstance().isShaderPackInUse();
+        return IrisApi.getInstance().isShaderPackInUse();
     }
 }
diff --git a/gradle.properties b/gradle.properties
index 7d764f8..4c88d65 100755
--- a/gradle.properties
+++ b/gradle.properties
@@ -13,7 +13,9 @@ modrinth_id=YQnwl5Vv
 
 midnightlib_version=1.5.7
 watermedia_version=2.0.63
-iris_version=1.7.1+1.21
+
+iris_version=1.6.17+1.20.4
+LATEST_IRIS_VERSION_CAUSES_BUILD_FAILURE=ThisIsFine
 
 fabric_loader_version=0.15.11
 fabric_api_version=0.100.1+1.21