diff --git a/tasks/tasks_nextstrain.wdl b/tasks/tasks_nextstrain.wdl
index ab041b70..f7c52974 100644
--- a/tasks/tasks_nextstrain.wdl
+++ b/tasks/tasks_nextstrain.wdl
@@ -541,7 +541,7 @@ task filter_sequences_by_length {
         File    sequences_fasta
         Int     min_non_N = 1
 
-        String  docker="quay.io/broadinstitute/viral-core:2.1.19"
+        String  docker="quay.io/broadinstitute/viral-core:2.1.19-rc2"
     }
     parameter_meta {
         sequences_fasta: {