diff --git a/kotlin/codegen/pom.xml b/kotlin/codegen/pom.xml
index 5e053f1..1a148b1 100644
--- a/kotlin/codegen/pom.xml
+++ b/kotlin/codegen/pom.xml
@@ -98,6 +98,7 @@
 
   <properties>
     <maven.javadoc.skip>true</maven.javadoc.skip><!-- We use Dokka instead. -->
+    <kotlin.compiler.jvmTarget>1.8</kotlin.compiler.jvmTarget>
   </properties>
 
   <build>
@@ -150,6 +151,7 @@
           <args>
             <!-- So we can declare ourselves as users of KotlinPoetMetadataPreview -->
             <arg>-Xuse-experimental=com.squareup.kotlinpoet.metadata.KotlinPoetMetadataPreview</arg>
+            <arg>-Xuse-experimental=kotlin.Experimental</arg>
           </args>
         </configuration>
       </plugin>
diff --git a/pom.xml b/pom.xml
index 27e729f..39ce45d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -37,7 +37,7 @@
     <okio.version>1.16.0</okio.version>
     <okio2.version>2.1.0</okio2.version>
     <kotlin.version>1.3.60</kotlin.version>
-    <kotlinpoet.version>1.4.4</kotlinpoet.version>
+    <kotlinpoet.version>1.5.0</kotlinpoet.version>
     <kotlinx-metadata.version>0.1.0</kotlinx-metadata.version>
     <maven-assembly.version>3.1.0</maven-assembly.version>