diff --git a/compat/compat-arrow/build.gradle.kts b/compat/compat-arrow/build.gradle.kts
index 1af3b88..05b505b 100644
--- a/compat/compat-arrow/build.gradle.kts
+++ b/compat/compat-arrow/build.gradle.kts
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2025, OpenSavvy and contributors.
+ * Copyright (c) 2025-2026, OpenSavvy and contributors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -77,6 +77,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }
diff --git a/compat/compat-filesystem/build.gradle.kts b/compat/compat-filesystem/build.gradle.kts
index 3f68d87..c3604b3 100644
--- a/compat/compat-filesystem/build.gradle.kts
+++ b/compat/compat-filesystem/build.gradle.kts
@@ -1,3 +1,19 @@
+/*
+ * Copyright (c) 2026, OpenSavvy and contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 plugins {
 	alias(opensavvyConventions.plugins.base)
 	alias(opensavvyConventions.plugins.kotlin.library)
@@ -31,6 +47,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }
diff --git a/compat/compat-java-time/build.gradle.kts b/compat/compat-java-time/build.gradle.kts
index 940498d..497e9ff 100644
--- a/compat/compat-java-time/build.gradle.kts
+++ b/compat/compat-java-time/build.gradle.kts
@@ -1,3 +1,19 @@
+/*
+ * Copyright (c) 2026, OpenSavvy and contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 plugins {
 	alias(opensavvyConventions.plugins.base)
 	alias(opensavvyConventions.plugins.kotlin.library)
@@ -31,6 +47,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }
diff --git a/compat/compat-ktor/build.gradle.kts b/compat/compat-ktor/build.gradle.kts
index 53e2f6f..f85eb16 100644
--- a/compat/compat-ktor/build.gradle.kts
+++ b/compat/compat-ktor/build.gradle.kts
@@ -91,6 +91,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }
diff --git a/compat/compat-parameterize/build.gradle.kts b/compat/compat-parameterize/build.gradle.kts
index daa5ac5..ead6ef1 100644
--- a/compat/compat-parameterize/build.gradle.kts
+++ b/compat/compat-parameterize/build.gradle.kts
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2025, OpenSavvy and contributors.
+ * Copyright (c) 2025-2026, OpenSavvy and contributors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -74,6 +74,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }
diff --git a/runners/runner-kotest/build.gradle.kts b/runners/runner-kotest/build.gradle.kts
index e2acbd2..77d30b6 100644
--- a/runners/runner-kotest/build.gradle.kts
+++ b/runners/runner-kotest/build.gradle.kts
@@ -102,6 +102,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }
diff --git a/runners/runner-kotlin-test/build.gradle.kts b/runners/runner-kotlin-test/build.gradle.kts
index 08c6171..b022fc0 100644
--- a/runners/runner-kotlin-test/build.gradle.kts
+++ b/runners/runner-kotlin-test/build.gradle.kts
@@ -70,6 +70,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }
diff --git a/runners/runner-testballoon/build.gradle.kts b/runners/runner-testballoon/build.gradle.kts
index 166b8e5..eb6dbf6 100644
--- a/runners/runner-testballoon/build.gradle.kts
+++ b/runners/runner-testballoon/build.gradle.kts
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2025, OpenSavvy and contributors.
+ * Copyright (c) 2025-2026, OpenSavvy and contributors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -77,6 +77,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }
diff --git a/suite/build.gradle.kts b/suite/build.gradle.kts
index a95ad7c..a9f1eb0 100644
--- a/suite/build.gradle.kts
+++ b/suite/build.gradle.kts
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2025, OpenSavvy and contributors.
+ * Copyright (c) 2025-2026, OpenSavvy and contributors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -83,6 +83,6 @@ library {
 	}
 }
 
-kotlin {
-	jvmToolchain(11)
+tapmoc {
+	java(11)
 }