diff --git a/conf.py b/conf.py
index 5887d3a70..5db9477ed 100644
--- a/conf.py
+++ b/conf.py
@@ -48,7 +48,7 @@
 source_suffix = ".rst"
 
 # The master toctree document.
-master_doc = "INDEX"
+master_doc = "index"
 
 # General information about the project.
 project = "testcontainers"
diff --git a/INDEX.rst b/index.rst
similarity index 100%
rename from INDEX.rst
rename to index.rst