diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5cea5b7..726c407 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       matrix:
         NXF_VER:
-          - "21.10.3"
+          - "21.10.6" ## TODO temporarily pinning later version that does work
           - "latest-everything"
         parameters:
           - "--perform_longread_qc false"
@@ -67,7 +67,7 @@ jobs:
     strategy:
       matrix:
         NXF_VER:
-          - "21.10.3"
+          - "21.10.6" ## TODO temporarily pinning later version that does work
           - "latest-everything"
 
     steps:
diff --git a/assets/samplesheet_schema.yaml b/assets/samplesheet_schema.yaml
index 366ee93..88ff451 100644
--- a/assets/samplesheet_schema.yaml
+++ b/assets/samplesheet_schema.yaml
@@ -53,5 +53,3 @@ properties:
         - fasta
 required:
   - samples
-  - run_accession
-  - instrument_platform