diff --git a/.github/workflows/qc.yml b/.github/workflows/qc.yml
index 9384d97..80785fe 100644
--- a/.github/workflows/qc.yml
+++ b/.github/workflows/qc.yml
@@ -4,11 +4,11 @@ name: CI
 
 # Controls when the action will run. 
 on:
-  # Triggers the workflow on push or pull request events but only for the main branch
+  # Triggers the workflow on push or pull request events but only for the master branch
   push:
-    branches: [ main ]
+    branches: [ master ]
   pull_request:
-    branches: [ main ]
+    branches: [ master ]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
@@ -19,7 +19,7 @@ jobs:
   ontology_qc:
     # The type of runner that the job will run on
     runs-on: ubuntu-latest
-    container: obolibrary/odkfull:v1.2.29
+    container: obolibrary/odkfull
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
@@ -28,6 +28,6 @@ jobs:
 
       - name: Run ontology QC checks
         env:
-          DEFAULT_BRANCH: main
+          DEFAULT_BRANCH: master
         run: cd src/ontology && make ROBOT_ENV='ROBOT_JAVA_ARGS=-Xmx6G' test IMP=false PAT=false