diff --git a/CLAUDE.md b/CLAUDE.md
index 4c85143..138122a 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -48,7 +48,7 @@ npm start      # Start production server
 - **nebula-runtime**: Script execution engine and HTTP server
 
 ### Key Technologies
-- **Kotlin 2.2.0** on JVM 21
+- **Kotlin 2.2.21** on JVM 21
 - **TestContainers 1.19.0** for container orchestration
 - **Ktor 2.3.12** for HTTP servers and clients
 - **Kotest 5.9.1** for testing with descriptive specifications
diff --git a/nebula-api/pom.xml b/nebula-api/pom.xml
index cc765bd..510bee5 100644
--- a/nebula-api/pom.xml
+++ b/nebula-api/pom.xml
@@ -11,20 +11,12 @@
 
     <artifactId>nebula-api</artifactId>
 
-    <properties>
-        <!-- The API should be published with 1.9, as it's consumed in projects that aren't yet upgraded to 2.x -->
-        <kotlin.version>1.9.24</kotlin.version>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
         </dependency>
-        <!-- don't bundle Kotlin stdlib - it's provided by the things that conume this API.
-        Also, since this API is consumed by things with differing API versions (1.9.x vs 2.1.x),
-        bundling this causes problems
-        -->
+        <!-- don't bundle Kotlin stdlib - it's provided by the things that consume this API -->
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>
             <artifactId>kotlin-stdlib</artifactId>
diff --git a/nebula-dsl/pom.xml b/nebula-dsl/pom.xml
index 082f8a3..7451f1c 100644
--- a/nebula-dsl/pom.xml
+++ b/nebula-dsl/pom.xml
@@ -135,21 +135,11 @@
         </dependency>
 
         <!-- http / ktor -->
-        <dependency>
-            <groupId>io.ktor</groupId>
-            <artifactId>ktor-server-netty-jvm</artifactId>
-            <version>${ktor.version}</version>
-        </dependency>
         <dependency>
             <groupId>io.ktor</groupId>
             <artifactId>ktor-client-cio-jvm</artifactId>
             <version>${ktor.version}</version>
         </dependency>
-        <dependency>
-            <groupId>io.ktor</groupId>
-            <artifactId>ktor-server-core-jvm</artifactId>
-            <version>${ktor.version}</version>
-        </dependency>
         <dependency>
             <groupId>io.ktor</groupId>
             <artifactId>ktor-client-core-jvm</artifactId>
diff --git a/nebula-runtime/pom.xml b/nebula-runtime/pom.xml
index 1daffb7..5a99dea 100644
--- a/nebula-runtime/pom.xml
+++ b/nebula-runtime/pom.xml
@@ -93,12 +93,6 @@
             <groupId>io.ktor</groupId>
             <artifactId>ktor-serialization-jackson-jvm</artifactId>
         </dependency>
-        <dependency>
-            <groupId>io.ktor</groupId>
-            <artifactId>ktor-server-core-jvm</artifactId>
-            <version>2.3.12</version>
-            <scope>compile</scope>
-        </dependency>
         <dependency>
             <groupId>io.ktor</groupId>
             <artifactId>ktor-client-cio-jvm</artifactId>
diff --git a/pom.xml b/pom.xml
index 916b2e4..6eef132 100644
--- a/pom.xml
+++ b/pom.xml
@@ -37,7 +37,7 @@
 
         <testcontainers.version>2.0.5</testcontainers.version>
 
-        <kotlin.version>2.2.0</kotlin.version>
+        <kotlin.version>2.2.21</kotlin.version>
         <kafka.version>3.4.0</kafka.version>
         <awssdk.version>2.26.27</awssdk.version>
         <ktor.version>2.3.12</ktor.version>