diff --git a/docs/architecture/psa-migration/outcome-analysis.sh b/docs/architecture/psa-migration/outcome-analysis.sh
index b26963b..1805a3c 100755
--- a/docs/architecture/psa-migration/outcome-analysis.sh
+++ b/docs/architecture/psa-migration/outcome-analysis.sh
@@ -43,8 +43,11 @@
     fi
 }
 
-# save current HEAD
-HEAD=$(git branch --show-current)
+# save current HEAD.
+# Note: this can optionally be updated to
+#   HEAD=$(git branch --show-current)
+# when using a Git version above 2.22
+HEAD=$(git rev-parse --abbrev-ref HEAD)
 
 # get the numbers before this PR for default and full
 cleanup