diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd2bbfd27503488cbb7b2e7aef30ff959f3f323d..e4ea01d37e5eda76fb668039c2ae615e0f5891da 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added ###
 
+### Changed ###
+
+### Deprecated ###
+
+### Removed ###
+
+### Fixed ###
+
+### Security ###
+
+## [0.4.1] 2021-02-10 ##
+
+### Added ###
+
 * Versioning support (experimental). The version db.Version class can
   represents particular entity versions and also the complete history of an
   entity.
diff --git a/DEPENDENCIES.md b/DEPENDENCIES.md
new file mode 100644
index 0000000000000000000000000000000000000000..fca1fdf0e87f3efe2d1f4646ebcf160c3ea75879
--- /dev/null
+++ b/DEPENDENCIES.md
@@ -0,0 +1,4 @@
+Python 3.5 or later
+pip 20.0.2 or later
+
+Any other dependencies are being installed via pip
diff --git a/RELEASE_GUIDELINES.md b/RELEASE_GUIDELINES.md
index 02be5c1ad19f6a3a405fb08d62e23dab350ad445..dd6d5af4c43e1eea17c70f29da837c905694fed4 100644
--- a/RELEASE_GUIDELINES.md
+++ b/RELEASE_GUIDELINES.md
@@ -16,21 +16,27 @@ guidelines of the CaosDB Project
 1. Create a release branch from the dev branch. This prevents further changes
    to the code base and a never ending release process. Naming: `release-<VERSION>`
 
-2. Check all general prerequisites.
+2. Update CHANGELOG.md
 
-3. Prepare [setup.py](./setup.py): Update the `MAJOR`, `MINOR`, `MICRO`, `PRE`
+3. Check all general prerequisites.
+
+4. Prepare [setup.py](./setup.py): Check the `MAJOR`, `MINOR`, `MICRO`, `PRE`
    variables and set `ISRELEASED` to `True`. Use the possibility to issue
    pre-release versions for testing.
 
-4. Merge the release branch into the master branch.
+5. Merge the release branch into the master branch.
 
-5. Tag the latest commit of the master branch with `v<VERSION>`.
+6. Tag the latest commit of the master branch with `v<VERSION>`.
 
-6. Delete the release branch.
+7. Delete the release branch.
 
-7. Remove possibly existing `./dist` directory with old release.
+8. Remove possibly existing `./dist` directory with old release.
 
-8. Publish the release by executing `./release.sh` with uploads the caosdb
+9. Publish the release by executing `./release.sh` with uploads the caosdb
    module to the Python Package Index [pypi.org](https://pypi.org).
 
-9. Merge the master branch back into the dev branch.
+10. Merge the master branch back into the dev branch.
+
+11. After the merge of master to dev, start a new development version by
+    setting `ISRELEASED` to `False` and by increasing at least the `MIRCO`
+    version in [setup.py](./setup.py)
diff --git a/setup.py b/setup.py
index 4ab2d7669cc4f6d3f4873c0265da6c8cf06932ba..c1c6b287a3044399403db810e851abb3a9b36985 100755
--- a/setup.py
+++ b/setup.py
@@ -49,7 +49,7 @@ MAJOR = 0
 MINOR = 4
 MICRO = 1
 PRE = ""  # e.g. rc0, alpha.1, 0.beta-23
-ISRELEASED = False
+ISRELEASED = True
 
 if PRE:
     VERSION = "{}.{}.{}-{}".format(MAJOR, MINOR, MICRO, PRE)