diff --git a/Changes b/Changes
index eb96cf5..1690ce5 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+0.59.3 2020-10-27
+    - [feature] Added "missing query reference" status code (diewald)
+
 0.59.2 2020-07-24
     - [feature] Add fingerprint method to index (diewald)
     - [bugfix] Fix deserialization of spans with attributes (diewald)
diff --git a/misc/errorcodes.md b/misc/errorcodes.md
index 0d24e56..fc63eda 100644
--- a/misc/errorcodes.md
+++ b/misc/errorcodes.md
@@ -40,6 +40,7 @@
 716: "Unknown relation"
 717: "Missing relation node"
 718: "Missing relation term"
+721: "Missing query reference"
 730: "Invalid match identifier"
 740: "Key definition is missing in term or span"
 741: "Match relation unknown"
diff --git a/pom.xml b/pom.xml
index b6d879d..d0e8b40 100644
--- a/pom.xml
+++ b/pom.xml
@@ -35,7 +35,7 @@
 
 	<groupId>de.ids_mannheim.korap</groupId>
 	<artifactId>Krill</artifactId>
-	<version>0.59.2</version>
+	<version>0.59.3</version>
 	<packaging>jar</packaging>
 
 	<name>Krill</name>
@@ -82,7 +82,7 @@
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
-			<version>4.11</version>
+			<version>4.13.1</version>
 			<scope>test</scope>
 		</dependency>
 
diff --git a/src/main/java/de/ids_mannheim/korap/util/StatusCodes.java b/src/main/java/de/ids_mannheim/korap/util/StatusCodes.java
index 4663363..33b330a 100644
--- a/src/main/java/de/ids_mannheim/korap/util/StatusCodes.java
+++ b/src/main/java/de/ids_mannheim/korap/util/StatusCodes.java
@@ -40,6 +40,7 @@
     public static final int MISSING_RELATION_NODE = 717;
     public static final int MISSING_RELATION_TERM = 718;
     public static final int INVALID_QUERY = 719;
+    public static final int MISSING_QUERY_REFERENCE = 721;
     
     public static final int INVALID_MATCH_ID = 730;
     public static final int MISSING_KEY = 740;