diff --git a/Dockerfile b/Dockerfile
index 13a43872..3ffc513e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM registry.access.redhat.com/ubi9/ubi:9.6-1758184894@sha256:dbc1e98d14a022542e45b5f22e0206d3f86b5bdf237b58ee7170c9ddd1b3a283
 
 ARG SYNC2JIRA_GIT_REPO=https://github.com/release-engineering/Sync2Jira.git
-ARG SYNC2JIRA_GIT_REF=master
+ARG SYNC2JIRA_GIT_REF=main
 ARG SYNC2JIRA_VERSION=
 
 LABEL \
diff --git a/Dockerfile.sync-page b/Dockerfile.sync-page
index 430e4807..cd018b52 100644
--- a/Dockerfile.sync-page
+++ b/Dockerfile.sync-page
@@ -1,7 +1,7 @@
 FROM registry.access.redhat.com/ubi9/ubi:9.6-1758184894@sha256:dbc1e98d14a022542e45b5f22e0206d3f86b5bdf237b58ee7170c9ddd1b3a283
 
 ARG SYNC2JIRA_GIT_REPO=https://github.com/release-engineering/Sync2Jira.git
-ARG SYNC2JIRA_GIT_REF=master
+ARG SYNC2JIRA_GIT_REF=main
 ARG SYNC2JIRA_VERSION=
 
 LABEL \
diff --git a/README.md b/README.md
index 1224771b..b59c3ddb 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Sync2Jira
 
-[![Documentation Status](https://readthedocs.org/projects/sync2jira/badge/?version=master)](https://sync2jira.readthedocs.io/en/master/?badge=master)
+[![Documentation Status](https://readthedocs.org/projects/sync2jira/badge/?version=main)](https://sync2jira.readthedocs.io/en/main/?badge=main)
 [![Coverage Status](https://coveralls.io/repos/github/release-engineering/Sync2Jira/badge.svg?branch=main)](https://coveralls.io/github/release-engineering/Sync2Jira?branch=main)
 ![Python 3.9+](https://img.shields.io/badge/python-3.9+-blue.svg)
 
@@ -216,9 +216,9 @@ The following environment variables can be used to configure both tools:
 
 Comprehensive documentation is available at [sync2jira.readthedocs.io](https://sync2jira.readthedocs.io/en/latest/):
 
-- [Quick Start Guide](https://sync2jira.readthedocs.io/en/master/quickstart.html)
-- [Configuration Reference](https://sync2jira.readthedocs.io/en/master/config-file.html)
-- [Sync Page Usage](https://sync2jira.readthedocs.io/en/master/sync_page.html)
+- [Quick Start Guide](https://sync2jira.readthedocs.io/en/main/quickstart.html)
+- [Configuration Reference](https://sync2jira.readthedocs.io/en/main/config-file.html)
+- [Sync Page Usage](https://sync2jira.readthedocs.io/en/main/sync_page.html)
 
 
 ## License
diff --git a/docs/source/conf.py b/docs/source/conf.py
index bd81781d..2438f237 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -61,7 +61,7 @@
 source_suffix = ".rst"
 
 # The master toctree document.
-master_doc = "index"
+index = "index"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -138,7 +138,7 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, "Sync2Jira.tex", "Sync2Jira Documentation", "Ralph Bean", "manual"),
+    (index, "Sync2Jira.tex", "Sync2Jira Documentation", "Ralph Bean", "manual"),
 ]
 
 
@@ -146,7 +146,7 @@
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [(master_doc, "sync2jira", "Sync2Jira Documentation", [author], 1)]
+man_pages = [(index, "sync2jira", "Sync2Jira Documentation", [author], 1)]
 
 
 # -- Options for Texinfo output ----------------------------------------------
@@ -156,7 +156,7 @@
 #  dir menu entry, description, category)
 texinfo_documents = [
     (
-        master_doc,
+        index,
         "Sync2Jira",
         "Sync2Jira Documentation",
         author,