diff --git a/.circleci/config.yml b/.circleci/config.yml
index 82ef4e4..8d8eb96 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -45,7 +45,7 @@ jobs:
       - image: cimg/openjdk:23.0
     steps:
       - build_and_test:
-          kotlin: 2.1.10
+          kotlin: 2.1.0
 
 workflows:
   bld:
diff --git a/.github/workflows/bld.yml b/.github/workflows/bld.yml
index ffcf68b..38ab640 100644
--- a/.github/workflows/bld.yml
+++ b/.github/workflows/bld.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         java-version: [17, 21, 23]
-        kotlin-version: [1.9.25, 2.1.10]
+        kotlin-version: [1.9.24, 2.1.0]
 
     steps:
       - name: Checkout source repository
diff --git a/.idea/libraries/bld.xml b/.idea/libraries/bld.xml
index 553c281..5c4010c 100644
--- a/.idea/libraries/bld.xml
+++ b/.idea/libraries/bld.xml
@@ -2,12 +2,12 @@
   <library name="bld">
     <CLASSES>
       <root url="file://$PROJECT_DIR$/lib/bld" />
-      <root url="jar://$USER_HOME$/.bld/dist/bld-2.2.0.jar!/" />
+      <root url="jar://$USER_HOME$/.bld/dist/bld-2.1.0.jar!/" />
     </CLASSES>
     <JAVADOC />
     <SOURCES>
       <root url="file://$PROJECT_DIR$/lib/bld" />
-      <root url="jar://$USER_HOME$/.bld/dist/bld-2.2.0-sources.jar!/" />
+      <root url="jar://$USER_HOME$/.bld/dist/bld-2.1.0-sources.jar!/" />
     </SOURCES>
     <excluded>
       <root url="jar://$PROJECT_DIR$/lib/bld/bld-wrapper.jar!/" />
diff --git a/.vscode/settings.json b/.vscode/settings.json
index a3f4fd0..4c33beb 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -9,7 +9,7 @@
     ],
     "java.configuration.updateBuildConfiguration": "automatic",
     "java.project.referencedLibraries": [
-        "${HOME}/.bld/dist/bld-2.2.0.jar",
+        "${HOME}/.bld/dist/bld-2.1.0.jar",
         "lib/**/*.jar"
     ]
 }
diff --git a/lib/bld/bld-wrapper.jar b/lib/bld/bld-wrapper.jar
index fede4fb..28ecede 100644
Binary files a/lib/bld/bld-wrapper.jar and b/lib/bld/bld-wrapper.jar differ
diff --git a/lib/bld/bld-wrapper.properties b/lib/bld/bld-wrapper.properties
index 97e82e4..a333b3e 100644
--- a/lib/bld/bld-wrapper.properties
+++ b/lib/bld/bld-wrapper.properties
@@ -4,9 +4,9 @@ bld.downloadLocation=
 bld.extensions=
 bld.javaOptions=
 bld.javacOptions=
-bld.extension-detekt=com.uwyn.rife2:bld-detekt:0.9.8
-bld.extension-dokka=com.uwyn.rife2:bld-dokka:1.0.3
-bld.extension-kotlin=com.uwyn.rife2:bld-kotlin:1.0.4
+bld.extension-detekt=com.uwyn.rife2:bld-detekt:0.9.7
+bld.extension-dokka=com.uwyn.rife2:bld-dokka:1.0.2
+bld.extension-kotlin=com.uwyn.rife2:bld-kotlin:1.0.3
 bld.repositories=MAVEN_LOCAL,MAVEN_CENTRAL,RIFE2_RELEASES,RIFE2_SNAPSHOTS
 bld.sourceDirectories=
-bld.version=2.2.0
+bld.version=2.1.0
diff --git a/src/bld/java/com/example/ExampleBuild.java b/src/bld/java/com/example/ExampleBuild.java
index 51473fa..8cfba0f 100644
--- a/src/bld/java/com/example/ExampleBuild.java
+++ b/src/bld/java/com/example/ExampleBuild.java
@@ -30,7 +30,7 @@ public class ExampleBuild extends Project {
         autoDownloadPurge = true;
         repositories = List.of(MAVEN_LOCAL, MAVEN_CENTRAL, RIFE2_RELEASES);
 
-        final var kotlin = version(2, 1, 10);
+        final var kotlin = version(2, 1, 0);
         scope(compile)
                 .include(dependency("org.jetbrains.kotlin", "kotlin-stdlib", kotlin));
         scope(test)