diff --git a/compat/compat-arrow/build.gradle.kts b/compat/compat-arrow/build.gradle.kts
index 0c05e9b..1749134 100644
--- a/compat/compat-arrow/build.gradle.kts
+++ b/compat/compat-arrow/build.gradle.kts
@@ -56,3 +56,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}
diff --git a/compat/compat-filesystem/build.gradle.kts b/compat/compat-filesystem/build.gradle.kts
index d4f2719..b7067d6 100644
--- a/compat/compat-filesystem/build.gradle.kts
+++ b/compat/compat-filesystem/build.gradle.kts
@@ -29,3 +29,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}
diff --git a/compat/compat-java-time/build.gradle.kts b/compat/compat-java-time/build.gradle.kts
index ae9de7d..c30802d 100644
--- a/compat/compat-java-time/build.gradle.kts
+++ b/compat/compat-java-time/build.gradle.kts
@@ -29,3 +29,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}
diff --git a/compat/compat-kotlinx-datetime/build.gradle.kts b/compat/compat-kotlinx-datetime/build.gradle.kts
index 37dda95..963e637 100644
--- a/compat/compat-kotlinx-datetime/build.gradle.kts
+++ b/compat/compat-kotlinx-datetime/build.gradle.kts
@@ -57,3 +57,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}
diff --git a/compat/compat-ktor/build.gradle.kts b/compat/compat-ktor/build.gradle.kts
index 2387591..4c572fe 100644
--- a/compat/compat-ktor/build.gradle.kts
+++ b/compat/compat-ktor/build.gradle.kts
@@ -50,3 +50,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}
diff --git a/compat/compat-parameterize/build.gradle.kts b/compat/compat-parameterize/build.gradle.kts
index cb643a1..34c480f 100644
--- a/compat/compat-parameterize/build.gradle.kts
+++ b/compat/compat-parameterize/build.gradle.kts
@@ -57,3 +57,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}
diff --git a/runners/runner-kotest/build.gradle.kts b/runners/runner-kotest/build.gradle.kts
index 6ee9b44..dd33a71 100644
--- a/runners/runner-kotest/build.gradle.kts
+++ b/runners/runner-kotest/build.gradle.kts
@@ -74,3 +74,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}
diff --git a/runners/runner-kotlin-test/build.gradle.kts b/runners/runner-kotlin-test/build.gradle.kts
index b6e237d..f44deae 100644
--- a/runners/runner-kotlin-test/build.gradle.kts
+++ b/runners/runner-kotlin-test/build.gradle.kts
@@ -66,3 +66,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}
diff --git a/suite/build.gradle.kts b/suite/build.gradle.kts
index 329bca9..aa5e5ec 100644
--- a/suite/build.gradle.kts
+++ b/suite/build.gradle.kts
@@ -57,3 +57,7 @@ library {
 		url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
 	}
 }
+
+kotlin {
+	jvmToolchain(11)
+}