diff --git a/software/rsem/preparereference/main.nf b/software/rsem/preparereference/main.nf
index d82e4270..8b53c095 100644
--- a/software/rsem/preparereference/main.nf
+++ b/software/rsem/preparereference/main.nf
@@ -11,7 +11,7 @@ process RSEM_PREPAREREFERENCE {
         mode: params.publish_dir_mode,
         saveAs: { filename -> saveFiles(filename:filename, options:params.options, publish_dir:getSoftwareName(task.process), publish_id:'') }
 
-    conda (params.enable_conda ? "bioconda::rsem=1.3.3 bioconda::star=2.7.6a" : null)
+    conda (params.enable_conda ? "bioconda::rsem=1.3.3=pl526hfbaaabd_1 bioconda::star=2.7.6a=0" : null)
     if (workflow.containerEngine == 'singularity' && !params.singularity_pull_docker_container) {
         container "https://depot.galaxyproject.org/singularity/mulled-v2-cf0123ef83b3c38c13e3b0696a3f285d3f20f15b:606b713ec440e799d53a2b51a6e79dbfd28ecf3e-0"
     } else {