diff --git a/doc/changes/changelog.md b/doc/changes/changelog.md
index b9d17d2..88a79ff 100644
--- a/doc/changes/changelog.md
+++ b/doc/changes/changelog.md
@@ -1,5 +1,6 @@
 # Changes
 
+* [0.6.21](changes_0.6.21.md)
 * [0.6.20](changes_0.6.20.md)
 * [0.6.19](changes_0.6.19.md)
 * [0.6.18](changes_0.6.18.md)
diff --git a/doc/changes/changes_0.6.21.md b/doc/changes/changes_0.6.21.md
new file mode 100644
index 0000000..c19bc2e
--- /dev/null
+++ b/doc/changes/changes_0.6.21.md
@@ -0,0 +1,37 @@
+# Udf Debugging Java 0.6.21, released 2026-??-??
+
+Code name: Fixed vulnerability CVE-2026-86231 in com.github.mwiede:jsch:jar:2.28.4:provided
+
+## Summary
+
+This release fixes the following vulnerability:
+
+### CVE-2026-86231 (CWE-298) in dependency `com.github.mwiede:jsch:jar:2.28.4:provided`
+A security flaw has been discovered in mwiede jsch up to 2.28.5. Affected is the function getRevokedKeys of the file src/main/java/com/jcraft/jsch/KnownHosts.java. Performing a manipulation of the argument known_hosts results in improper check for certificate revocation. The attack is possible to be carried out remotely. The attack is considered to have high complexity. The exploitability is told to be difficult. The exploit has been released to the public and may be used for attacks. Upgrading to version 2.28.6 is able to address this issue. The patch is named 194a2f76a5c0f1c3f778565be3fd66bcafc42d23. You should upgrade the affected component.
+#### References
+* https://guide.sonatype.com/vulnerability/CVE-2026-86231?component-type=maven&component-name=com.github.mwiede%2Fjsch&utm_source=ossindex-client&utm_medium=integration&utm_content=1.8.1
+* http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2026-86231
+* https://github.com/mwiede/jsch/issues/1091
+* https://github.com/mwiede/jsch/pull/1098
+* https://github.com/mwiede/jsch/releases/tag/jsch-2.28.6
+
+## Security
+
+* #88: Fixed vulnerability CVE-2026-86231 in dependency `com.github.mwiede:jsch:jar:2.28.4:provided`
+
+## Dependency Updates
+
+### Compile Dependency Updates
+
+* Updated `com.exasol:bucketfs-java:4.0.0` to `5.0.0`
+* Updated `org.slf4j:slf4j-jdk14:2.0.18` to `2.0.19`
+
+### Test Dependency Updates
+
+* Updated `com.exasol:exasol-testcontainers:7.3.0` to `8.0.2`
+* Updated `com.exasol:test-db-builder-java:4.0.1` to `4.0.2`
+* Updated `org.junit.jupiter:junit-jupiter-params:5.14.4` to `6.1.3`
+
+### Plugin Dependency Updates
+
+* Updated `com.exasol:project-keeper-maven-plugin:5.7.3` to `5.7.5`
diff --git a/pk_generated_parent.pom b/pk_generated_parent.pom
index d776ad2..a87e0dc 100644
--- a/pk_generated_parent.pom
+++ b/pk_generated_parent.pom
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.exasol</groupId>
     <artifactId>udf-debugging-java-generated-parent</artifactId>
-    <version>0.6.20</version>
+    <version>0.6.21</version>
     <packaging>pom</packaging>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
diff --git a/pom.xml b/pom.xml
index 685740a..d39c672 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>udf-debugging-java</artifactId>
-    <version>0.6.20</version>
+    <version>0.6.21</version>
     <name>udf-debugging-java</name>
     <description>Utilities for debugging, profiling and code coverage measure for UDFs.</description>
     <url>https://github.com/exasol/udf-debugging-java/</url>
@@ -41,7 +41,7 @@
         <dependency>
             <groupId>com.exasol</groupId>
             <artifactId>bucketfs-java</artifactId>
-            <version>4.0.0</version>
+            <version>5.0.0</version>
         </dependency>
         <dependency>
             <groupId>com.exasol</groupId>
@@ -63,7 +63,7 @@
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-params</artifactId>
             <!-- Version 6 requires Java 17 -->
-            <version>5.14.4</version>
+            <version>6.1.3</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -82,7 +82,7 @@
         <dependency>
             <groupId>com.exasol</groupId>
             <artifactId>exasol-testcontainers</artifactId>
-            <version>7.3.0</version>
+            <version>8.0.2</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -94,7 +94,7 @@
         <dependency>
             <groupId>com.exasol</groupId>
             <artifactId>test-db-builder-java</artifactId>
-            <version>4.0.1</version>
+            <version>4.0.2</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -107,7 +107,7 @@
             <!-- Enable log output for integration tests -->
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-jdk14</artifactId>
-            <version>2.0.18</version>
+            <version>2.0.19</version>
         </dependency>
     </dependencies>
     <build>
@@ -133,7 +133,7 @@
             <plugin>
                 <groupId>com.exasol</groupId>
                 <artifactId>project-keeper-maven-plugin</artifactId>
-                <version>5.7.3</version>
+                <version>5.7.5</version>
                 <executions>
                     <execution>
                         <goals>
@@ -147,7 +147,7 @@
     <parent>
         <artifactId>udf-debugging-java-generated-parent</artifactId>
         <groupId>com.exasol</groupId>
-        <version>0.6.20</version>
+        <version>0.6.21</version>
         <relativePath>pk_generated_parent.pom</relativePath>
     </parent>
 </project>