diff --git a/CITATION.cff b/CITATION.cff
index c9cb4f378d73585d8cdd1c9b8d54569b4b4c13bb..82483dc719d12b6eab06540ac96907338e5c5237 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -1,8 +1,8 @@
 cff-version: 1.2.0
 message: "If you use this software, please cite it as below."
 title: Euclid
-version: 2.0
-date-released: 2022-01-03
+version: 2.1
+date-released: 2022-03-27
 url: "https://github.com/BlueObelisk/cmlxom"
 preferred-citation:
   type: article
diff --git a/README.md b/README.md
index b60fb8ba23ab22772ee8d7d33d63900509fb171f..d885ef9cbaf38f07b7395bd54c1ddbbb7ee520d9 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # CML Euclid
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.blueobelisk/euclid/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.blueobelisk/euclid)
 [![Build Status](https://github.com/BlueObelisk/euclid/actions/workflows/maven.yml/badge.svg)](https://github.com/BlueObelisk/euclid/actions/workflows/maven.yml)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.5815148.svg)](https://doi.org/10.5281/zenodo.5815148)
 
 A library of numeric, geometric and XML routines
 
@@ -15,7 +16,7 @@ It's used a lot in CML tools (JUMBO, JUMBO-converters) and also AMI (for extract
 Instructions to increase the version:
 
 ```shell
-mvn versions:set -DnewVersion=1.4-SNAPSHOT
+mvn versions:set -DnewVersion=2.2-SNAPSHOT
 ```
 
 Deploy to Sonatype with the following commands, for snapshots and releases respectively:
diff --git a/pom.xml b/pom.xml
index d0dcdaedb496b691c67177e25ed1acd7aff07108..92f4097c265e45ea3fd0b2fc7042f44fa07db1eb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
 
   <groupId>org.blueobelisk</groupId>
   <artifactId>euclid</artifactId>
-  <version>2.0</version>
+  <version>2.1</version>
   <packaging>jar</packaging>
 
   <properties>
@@ -80,7 +80,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>3.2.0</version>
+        <version>3.3.2</version>
         <executions>
           <execution>
             <id>attach-javadocs</id>
@@ -207,7 +207,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.13.1</version>
+      <version>4.13.2</version>
       <!--
       <scope>test</scope>
       -->
@@ -230,19 +230,19 @@
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j</artifactId>
-      <version>2.17.1</version>
+      <version>2.17.2</version>
       <type>pom</type>
     </dependency>
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-1.2-api</artifactId>
-      <version>2.17.1</version>
+      <version>2.17.2</version>
     </dependency>
 
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-lang3</artifactId>
-      <version>3.0</version>
+      <version>3.12.0</version>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>
@@ -253,7 +253,7 @@
     <dependency>
       <groupId>joda-time</groupId>
       <artifactId>joda-time</artifactId>
-      <version>1.6.2</version>
+      <version>2.10.14</version>
     </dependency>
 
     <dependency>