diff --git a/.github/actions/security-issues/action.yml b/.github/actions/security-issues/action.yml
index 5e7cad9f6a..70a06b4b5e 100644
--- a/.github/actions/security-issues/action.yml
+++ b/.github/actions/security-issues/action.yml
@@ -39,7 +39,7 @@ runs:
     - name: Install Python Toolbox / Security tool
       shell: bash
       run: |
-        pip install exasol-toolbox==6.3.0
+        pip install exasol-toolbox==6.4.0
 
     - name: Create Security Issue Report
       shell: bash
diff --git a/doc/changes/changelog.md b/doc/changes/changelog.md
index 34d1397ca4..a73cd6e31b 100644
--- a/doc/changes/changelog.md
+++ b/doc/changes/changelog.md
@@ -1,6 +1,7 @@
 # Changelog
 
 * [unreleased](unreleased.md)
+* [6.4.0](changes_6.4.0.md)
 * [6.3.0](changes_6.3.0.md)
 * [6.2.0](changes_6.2.0.md)
 * [6.1.1](changes_6.1.1.md)
@@ -62,6 +63,7 @@
 hidden:
 ---
 unreleased
+changes_6.4.0
 changes_6.3.0
 changes_6.2.0
 changes_6.1.1
diff --git a/doc/changes/changes_6.4.0.md b/doc/changes/changes_6.4.0.md
new file mode 100644
index 0000000000..cfc1434c6b
--- /dev/null
+++ b/doc/changes/changes_6.4.0.md
@@ -0,0 +1,24 @@
+# 6.4.0 - 2026-04-22
+
+## Summary
+
+This release includes a few notable improvements:
+* The nox session `release:prepare` automatically reports resolved security issues.
+* The stability of the `tbx security cve` CLI commands is improved with new test coverage
+to help ensure it works for non-Python projects.
+
+## Features
+
+* #777: Improved VulnerabilityMatcher to handle packages with multiple vulnerabilities
+* #517: Modified nox session `release:prepare` to report resolved security issues
+
+## Refactoring
+
+* #731: Reduced costly `test-python-environment.yml` to run when triggered on `main` or when the files related to the action are altered
+* #785: Removed nox session `project:report` and metrics-schema, as superseded by Sonar usage
+* #763: Parsed and manipulated Changes Files
+* #788: Removed tbx workflow CLI commands, as superseded by nox session `workflow:generate`
+
+## Bugfix
+
+* #798: Added test to ensure `tbx security cve` works
diff --git a/doc/changes/unreleased.md b/doc/changes/unreleased.md
index dc2b13ef08..fb4737052b 100644
--- a/doc/changes/unreleased.md
+++ b/doc/changes/unreleased.md
@@ -1,19 +1,3 @@
 # Unreleased
 
 ## Summary
-
-## Features
-
-* #777: Improved VulnerabilityMatcher to handle packages with multiple vulnerabilities
-* #517: Modified nox session `release:prepare` to report resolved security issues
-
-## Refactoring
-
-* #731: Reduced costly `test-python-environment.yml` to run when triggered on `main` or when the files related to the action are altered
-* #785: Removed nox session `project:report` and metrics-schema, as superseded by Sonar usage
-* #763: Parsed and manipulated Changes Files
-* #788: Removed tbx workflow CLI commands, as superseded by nox session `workflow:generate`
-
-## Bugfix
-
-* #798: Added test to ensure `tbx security cve` works
diff --git a/exasol/toolbox/version.py b/exasol/toolbox/version.py
index 78a301a6d3..9cd7a2afe7 100644
--- a/exasol/toolbox/version.py
+++ b/exasol/toolbox/version.py
@@ -9,7 +9,7 @@
 """
 
 MAJOR = 6
-MINOR = 3
+MINOR = 4
 PATCH = 0
 VERSION = f"{MAJOR}.{MINOR}.{PATCH}"
 __version__ = VERSION
diff --git a/project-template/cookiecutter.json b/project-template/cookiecutter.json
index 40610cec58..08df5cac55 100644
--- a/project-template/cookiecutter.json
+++ b/project-template/cookiecutter.json
@@ -9,7 +9,7 @@
   "author_email": "opensource@exasol.com",
   "project_short_tag": "",
   "python_version_min": "3.10",
-  "exasol_toolbox_version_range": ">=6.3.0,<7",
+  "exasol_toolbox_version_range": ">=6.4.0,<7",
   "license_year": "{% now 'utc', '%Y' %}",
   "__repo_name_slug": "{{cookiecutter.package_name}}",
   "__package_name_slug": "{{cookiecutter.package_name}}",
diff --git a/pyproject.toml b/pyproject.toml
index c858dd87b1..bb50415a45 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "exasol-toolbox"
-version = "6.3.0"
+version = "6.4.0"
 description = "Your one-stop solution for managing all standard tasks and core workflows of your Python project."
 authors = [
     { name = "Nicola Coretti", email = "nicola.coretti@exasol.com" },