diff --git a/.github/workflows/directory_writer.yml b/.github/workflows/directory_writer.yml
index d164300..25b80e8 100644
--- a/.github/workflows/directory_writer.yml
+++ b/.github/workflows/directory_writer.yml
@@ -7,7 +7,7 @@ on:
   pull_request:
   push:
     branches:
-      - "master"
+      - "main"
 
 jobs:
   Update_DIRECTORY:
diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 7bf067d..924b13c 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -5,13 +5,13 @@ name: Tests
 
 on:
   push:
-    branches: [master]
+    branches: [main]
     paths-ignore:
       - "doc/**"
       - "gh-disabled-workflows/**"
       - "*.md"
   pull_request:
-    branches: [master]
+    branches: [main]
     paths-ignore:
       - "doc/**"
       - "gh-disabled-workflows/**"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cdcde4..13dd0a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -98,7 +98,7 @@ See [#47]
 
 - Added the possibility to specify and create multiple graph-visualizations in one file [#25]
 - Added test case _test_vc_multiple_and_join_ in [commit aa31901](https://github.com/VaeterchenFrost/tdvisu/commit/aa319016ac71f9a54023474bf820cb30929c52a8)
-- Added test cases for [construct_dpdb_visu](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_construct_dpdb.py)
+- Added test cases for [construct_dpdb_visu](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_construct_dpdb.py)
 - Add pytest-mock to tests_require
 
 ### Changed
@@ -275,9 +275,9 @@ See [#47]
 [@VaeterchenFrost]: https://github.com/VaeterchenFrost
 [PyPI]: https://pypi.org/project/tdvisu/
 [mypy]: https://github.com/python/mypy
-[DIRECTORY]: https://github.com/VaeterchenFrost/tdvisu/blob/master/DIRECTORY.md
+[DIRECTORY]: https://github.com/VaeterchenFrost/tdvisu/blob/main/DIRECTORY.md
 [Codecov]: https://codecov.io/gh/VaeterchenFrost/tdvisu
-[Unreleased]: https://github.com/VaeterchenFrost/tdvisu/compare/v1.2.0...master
+[Unreleased]: https://github.com/VaeterchenFrost/tdvisu/compare/v1.2.0...main
 [1.2.0]: https://github.com/VaeterchenFrost/tdvisu/releases/tag/v1.2.0
 [1.1.9]: https://github.com/VaeterchenFrost/tdvisu/releases/tag/v1.1.9
 [1.1.8]: https://github.com/VaeterchenFrost/tdvisu/releases/tag/v1.1.8
diff --git a/DIRECTORY.md b/DIRECTORY.md
index 7b0ee6b..21a73ee 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -1,22 +1,22 @@
 
-## [Setup](https://github.com/VaeterchenFrost/tdvisu/blob/master/setup.py)
+## [Setup](https://github.com/VaeterchenFrost/tdvisu/blob/main/setup.py)
 
 ## Tdvisu
-  * [Construct Dpdb Visu](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/construct_dpdb_visu.py)
-  * [Dijkstra](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/dijkstra.py)
-  * [Reader](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/reader.py)
-  * [Svgjoin](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/svgjoin.py)
-  * [Utilities](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/utilities.py)
-  * [Version](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/version.py)
-  * [Visualization](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/visualization.py)
-  * [Visualization Data](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/visualization_data.py)
+  * [Construct Dpdb Visu](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/construct_dpdb_visu.py)
+  * [Dijkstra](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/dijkstra.py)
+  * [Reader](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/reader.py)
+  * [Svgjoin](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/svgjoin.py)
+  * [Utilities](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/utilities.py)
+  * [Version](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/version.py)
+  * [Visualization](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/visualization.py)
+  * [Visualization Data](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/visualization_data.py)
 
 ## Test
-  * [Test Bag Creation](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_bag_creation.py)
-  * [Test Construct Dpdb](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_construct_dpdb.py)
-  * [Test Dijkstra](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_dijkstra.py)
-  * [Test Reader](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_reader.py)
-  * [Test Svgjoin](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_svgjoin.py)
-  * [Test Utilities](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_utilities.py)
-  * [Test Version](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_version.py)
-  * [Test Visualization](https://github.com/VaeterchenFrost/tdvisu/blob/master/test/test_visualization.py)
+  * [Test Bag Creation](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_bag_creation.py)
+  * [Test Construct Dpdb](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_construct_dpdb.py)
+  * [Test Dijkstra](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_dijkstra.py)
+  * [Test Reader](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_reader.py)
+  * [Test Svgjoin](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_svgjoin.py)
+  * [Test Utilities](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_utilities.py)
+  * [Test Version](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_version.py)
+  * [Test Visualization](https://github.com/VaeterchenFrost/tdvisu/blob/main/test/test_visualization.py)
diff --git a/README.md b/README.md
index 2f724ef..5af862c 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 ![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg)
 [![PyPI license](https://img.shields.io/pypi/l/tdvisu.svg)](https://pypi.python.org/pypi/tdvisu/)
 ![Tests](https://github.com/VaeterchenFrost/tdvisu/workflows/Tests/badge.svg)
-[![codecov](https://codecov.io/gh/VaeterchenFrost/tdvisu/branch/master/graph/badge.svg)](https://codecov.io/gh/VaeterchenFrost/tdvisu)
+[![codecov](https://codecov.io/gh/VaeterchenFrost/tdvisu/branch/main/graph/badge.svg)](https://codecov.io/gh/VaeterchenFrost/tdvisu)
 
 ![GitHub release (latest SemVer including pre-releases)](https://img.shields.io/github/v/release/vaeterchenfrost/tdvisu?include_prereleases)
 [![PyPI version fury.io](https://badge.fury.io/py/tdvisu.svg)](https://pypi.python.org/pypi/tdvisu/)
@@ -132,11 +132,11 @@ pytest ./test/
 
 # How to use
 
-The visualization needs input in the form of the [Json API](https://github.com/VaeterchenFrost/gpusat-VISU/blob/master/JsonAPI_v1.3.md).
+The visualization needs input in the form of the [Json API](https://github.com/VaeterchenFrost/gpusat-VISU/blob/main/JsonAPI_v1.3.md).
 The creation of this file is exemplary implemented in _construct_dpdb_visu.py_ or the fork [GPUSAT](https://github.com/VaeterchenFrost/GPUSAT) and _--visufile filename_ (optionally disabling preprocessing with _-p_).
 
 Run the python file with the above dependencies installed:
-[visualization.py](https://github.com/VaeterchenFrost/gpusat-VISU/blob/master/satvisualization_repo/satvisu/visualization.py)
+[visualization.py](https://github.com/VaeterchenFrost/gpusat-VISU/blob/main/satvisualization_repo/satvisu/visualization.py)
 
 **visualization.py** takes two parameters, the json-**infile** to read from, and optionally one **outputfolder**.
 With both arguments a run might look like this:
@@ -153,13 +153,13 @@ For #SAT it produces for example three different graphs suffixed with a running
 
 The graphs are images encoded in resolution independent **.svg files** (see https://www.lifewire.com/svg-file-4120603)
 
-<p align="center"><img src="https://raw.githubusercontent.com/VaeterchenFrost/tdvisu/master/doc/images/combined6DA4.svg?sanitize=true" width="70%"/></p>
+<p align="center"><img src="https://raw.githubusercontent.com/VaeterchenFrost/tdvisu/main/doc/images/combined6DA4.svg?sanitize=true" width="70%"/></p>
 
 ## How to use construct_dpdb_visu.py
 
 After installing the project [dp_on_dbs](https://github.com/hmarkus/dp_on_dbs) with the there listed [requirements](https://github.com/hmarkus/dp_on_dbs#requirements), we need to
 
-- edit the [database.ini](https://github.com/VaeterchenFrost/tdvisu/blob/master/tdvisu/database.ini) with our password to [postgresql](https://www.postgresql.org/)
+- edit the [database.ini](https://github.com/VaeterchenFrost/tdvisu/blob/main/tdvisu/database.ini) with our password to [postgresql](https://www.postgresql.org/)
 - Solve a problem with `python dpdb.py [GENERAL-OPTIONS] -f <INPUT-FILE> <PROBLEM> [PROBLEM-SPECIFIC-OPTIONS]`
   - for the problem **VertexCover**
     - with flag `--gr-file` to store the htd Input (if the input was in a different format)
@@ -206,7 +206,7 @@ In case dependencies have changed, or just to update some, check
 
 ## Push
 
-- Push changes to master
+- Push changes to main
 - Wait for all automated checks! (All checks have passed...)
 
 ## Create Release
@@ -219,7 +219,7 @@ In case dependencies have changed, or just to update some, check
 
 ## Should automatically release to [PyPI](https://pypi.org/project/tdvisu/)
 
-- For details see: [Upload Python Package](https://github.com/VaeterchenFrost/tdvisu/blob/master/.github/workflows/python-publish.yml)
+- For details see: [Upload Python Package](https://github.com/VaeterchenFrost/tdvisu/blob/main/.github/workflows/python-publish.yml)
 
 **Now you are set for the new release :tada:**
 
diff --git a/TDVisu.schema.json b/TDVisu.schema.json
index 4596105..2e0bef0 100644
--- a/TDVisu.schema.json
+++ b/TDVisu.schema.json
@@ -1,6 +1,6 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema",
-  "$id": "https://raw.githubusercontent.com/VaeterchenFrost/tdvisu/master/TDVisu.schema.json",
+  "$id": "https://raw.githubusercontent.com/VaeterchenFrost/tdvisu/main/TDVisu.schema.json",
   "type": "object",
   "title": "The root schema for TDVisu",
   "description": "The schema describes the valid JSON input for visualizing dynamic programming on tree-decompositions in TDVisu.",
diff --git a/scripts/build_directory_md.py b/scripts/build_directory_md.py
index 562bd4c..042e857 100644
--- a/scripts/build_directory_md.py
+++ b/scripts/build_directory_md.py
@@ -30,7 +30,7 @@
 from typing import Iterator
 from urllib.parse import quote
 
-URL_BASE = "https://github.com/VaeterchenFrost/tdvisu/blob/master"
+URL_BASE = "https://github.com/VaeterchenFrost/tdvisu/blob/main"
 
 AFFECTED_EXT = (
     ".py",