diff --git a/dependabot_file.py b/dependabot_file.py
index 2512b48..3585735 100644
--- a/dependabot_file.py
+++ b/dependabot_file.py
@@ -234,7 +234,7 @@ def build_dependabot_file(repo, group_dependencies, exempt_ecosystems) -> str |
         ):
             compatible_package_manager_found = True
             hex_found = True
-            dependabot_file += make_dependabot_config("hex", group_dependencies)
+            dependabot_file += make_dependabot_config("mix", group_dependencies)
     except github3.exceptions.NotFoundError:
         pass
     try:
@@ -245,7 +245,7 @@ def build_dependabot_file(repo, group_dependencies, exempt_ecosystems) -> str |
         ):
             compatible_package_manager_found = True
             hex_found = True
-            dependabot_file += make_dependabot_config("hex", group_dependencies)
+            dependabot_file += make_dependabot_config("mix", group_dependencies)
     except github3.exceptions.NotFoundError:
         pass
 
diff --git a/test_dependabot_file.py b/test_dependabot_file.py
index ef1c4ca..7bb6bb8 100644
--- a/test_dependabot_file.py
+++ b/test_dependabot_file.py
@@ -153,7 +153,7 @@ def test_build_dependabot_file_with_hex(self):
             expected_result = """---
 version: 2
 updates:
-  - package-ecosystem: 'hex'
+  - package-ecosystem: 'mix'
     directory: '/'
     schedule:
         interval: 'weekly'