diff --git a/node/src/main/kotlin/net/corda/node/services/rpc/CheckpointDumperImpl.kt b/node/src/main/kotlin/net/corda/node/services/rpc/CheckpointDumperImpl.kt
index c3116f03cb..48154c44eb 100644
--- a/node/src/main/kotlin/net/corda/node/services/rpc/CheckpointDumperImpl.kt
+++ b/node/src/main/kotlin/net/corda/node/services/rpc/CheckpointDumperImpl.kt
@@ -440,7 +440,7 @@ class CheckpointDumperImpl(private val checkpointStorage: CheckpointStorage, pri
 
     private object MapSerializer : JsonSerializer<Map<Any, Any>>() {
         override fun serialize(map: Map<Any, Any>, gen: JsonGenerator, serializers: SerializerProvider) {
-            gen.writeStartArray(map.size)
+            gen.writeStartArray()
             map.forEach { (key, value) ->
                 gen.jsonObject {
                     writeObjectField("key", key)
diff --git a/samples/irs-demo/cordapp/workflows-irs/build.gradle b/samples/irs-demo/cordapp/workflows-irs/build.gradle
index ce09b2a803..ff88428b24 100644
--- a/samples/irs-demo/cordapp/workflows-irs/build.gradle
+++ b/samples/irs-demo/cordapp/workflows-irs/build.gradle
@@ -16,7 +16,7 @@ dependencies {
     cordaCompile project(':core')
     
 
-    compile("com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_version")
+    compile("com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_kotlin_version")
     
     // only included to control the `DemoClock` as part of the demo application
     // normally `:node` should not be depended on in any CorDapps
diff --git a/samples/irs-demo/web/build.gradle b/samples/irs-demo/web/build.gradle
index c7f130691c..4281e2df7f 100644
--- a/samples/irs-demo/web/build.gradle
+++ b/samples/irs-demo/web/build.gradle
@@ -70,7 +70,7 @@ dependencies {
     }
     compile('org.springframework.boot:spring-boot-starter-log4j2')
     runtimeOnly("org.apache.logging.log4j:log4j-web:$log4j_version")
-    compile("com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_version")
+    compile("com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_kotlin_version")
     compile project(":client:rpc")
     compile project(":client:jackson")
     compile project(":finance:workflows")
diff --git a/testing/test-cli/build.gradle b/testing/test-cli/build.gradle
index a668c605f4..d4de7deba0 100644
--- a/testing/test-cli/build.gradle
+++ b/testing/test-cli/build.gradle
@@ -6,7 +6,7 @@ dependencies {
     compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
     compile "com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:$jackson_version"
     compile "com.fasterxml.jackson.core:jackson-databind:$jackson_version"
-    compile "com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_version"
+    compile "com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_kotlin_version"
     
     compile "org.junit.jupiter:junit-jupiter-api:${junit_jupiter_version}"
     compile "junit:junit:${junit_version}"
diff --git a/tools/network-builder/build.gradle b/tools/network-builder/build.gradle
index 3306ac7c15..7ff937e388 100644
--- a/tools/network-builder/build.gradle
+++ b/tools/network-builder/build.gradle
@@ -52,7 +52,7 @@ dependencies {
     compile "com.typesafe:config:$typesafe_config_version"
     compile "com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:$jackson_version"
     compile "com.fasterxml.jackson.core:jackson-databind:$jackson_version"
-    compile "com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_version"
+    compile "com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_kotlin_version"
     compile "info.picocli:picocli:$picocli_version"
 
     // TornadoFX: A lightweight Kotlin framework for working with JavaFX UI's.