diff --git a/conf/base.config b/conf/base.config
index 1d273c8..f630885 100644
--- a/conf/base.config
+++ b/conf/base.config
@@ -19,7 +19,7 @@ process {
 
     withName: GLIMPSE2_PHASE {
         cpus   = { check_max( 8    * task.attempt, 'cpus'    ) }
-        memory = { check_max( 20.GB * task.attempt, 'memory' ) }
+        memory = { check_max( 20.GB * (task.attempt ** 1.5), 'memory' ) }
         time   = { check_max( 12.h  * task.attempt, 'time'   ) }
     }
 
diff --git a/modules/local/bcftools_impute_info/main.nf b/modules/local/bcftools_impute_info/main.nf
index 1fd1408..1cd3c1b 100644
--- a/modules/local/bcftools_impute_info/main.nf
+++ b/modules/local/bcftools_impute_info/main.nf
@@ -2,6 +2,10 @@ process BCFTOOLS_IMPUTE_INFO {
 
     label 'process_medium'
 
+    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
+        'https://depot.galaxyproject.org/singularity/bcftools:1.18--h8b25389_0':
+        'biocontainers/bcftools:1.18--h8b25389_0' }"
+
     publishDir "${params.publishdir}", mode: 'copy', pattern: "glimpse_vcf_annotated.vcf.gz"
     publishDir "${params.publishdir}", mode: 'copy', pattern: "glimpse_vcf_annotated.vcf.gz.csi"
 
diff --git a/modules/local/split_vcfs/main.nf b/modules/local/split_vcfs/main.nf
index fd26dd6..4a6337f 100644
--- a/modules/local/split_vcfs/main.nf
+++ b/modules/local/split_vcfs/main.nf
@@ -2,6 +2,10 @@ process SPLIT_VCFS {
 
     label 'process_medium'
 
+    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
+        'https://depot.galaxyproject.org/singularity/bcftools:1.18--h8b25389_0':
+        'biocontainers/bcftools:1.18--h8b25389_0' }"
+
     input:
     tuple val(meta), path(vcf), path(sample_list)