diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yaml
similarity index 100%
rename from .github/workflows/documentation.yml
rename to .github/workflows/documentation.yaml
diff --git a/.github/workflows/release-checksum.yml b/.github/workflows/release-checksum.yaml
similarity index 100%
rename from .github/workflows/release-checksum.yml
rename to .github/workflows/release-checksum.yaml
diff --git a/.github/workflows/sonarqube.yml b/.github/workflows/sonarqube.yaml
similarity index 100%
rename from .github/workflows/sonarqube.yml
rename to .github/workflows/sonarqube.yaml
diff --git a/.github/workflows/trigger_metplus.yml b/.github/workflows/trigger_metplus.yaml
similarity index 98%
rename from .github/workflows/trigger_metplus.yml
rename to .github/workflows/trigger_metplus.yaml
index bd70bc1a..85e6663e 100644
--- a/.github/workflows/trigger_metplus.yml
+++ b/.github/workflows/trigger_metplus.yaml
@@ -3,7 +3,7 @@ name: Trigger METplus Workflow
 on:
   push:
     branches:
-      - develop
+      - main
     paths-ignore:
       - 'docs/**'
       - '.github/pull_request_template.md'
diff --git a/metplotpy/plots/config/histogram_defaults.yml b/metplotpy/plots/config/histogram_defaults.yaml
similarity index 100%
rename from metplotpy/plots/config/histogram_defaults.yml
rename to metplotpy/plots/config/histogram_defaults.yaml
diff --git a/metplotpy/plots/histogram/histogram.py b/metplotpy/plots/histogram/histogram.py
index f51bb0eb..231d333f 100644
--- a/metplotpy/plots/histogram/histogram.py
+++ b/metplotpy/plots/histogram/histogram.py
@@ -46,7 +46,7 @@ def __init__(self, parameters, data):
             ValueError: If the data array has dimension not equal 2.
         """
 
-        default_conf_filename = "histogram_defaults.yml"
+        default_conf_filename = "histogram_defaults.yaml"
         # init common layout
         super().__init__(parameters, default_conf_filename)
 
diff --git a/metplotpy/plots/scatter/scatter_defaults.yml b/metplotpy/plots/scatter/scatter_defaults.yaml
similarity index 100%
rename from metplotpy/plots/scatter/scatter_defaults.yml
rename to metplotpy/plots/scatter/scatter_defaults.yaml