diff --git a/variants/gatkrunner.sh b/variants/gatkrunner.sh
index 864331c821f2a4dc4c815720a11272742814965a..4a610ad37f2df7246ecfb9210a3f20442e0355fe 100755
--- a/variants/gatkrunner.sh
+++ b/variants/gatkrunner.sh
@@ -69,14 +69,14 @@ then
     samtools index -@ $SLURM_CPUS_ON_NODE ${pair_id}.clean.bam
     java -Xmx4g -jar $GATK_JAR -L ${index_path}/../gatk_regions.list -T SplitNCigarReads -R ${reffa} -I ${pair_id}.sort.bam -o ${pair_id}.split.bam -rf ReassignOneMappingQuality -RMQF 255 -RMQT 60 -U ALLOW_N_CIGAR_READS
     java -Xmx32g -jar $GATK_JAR -L ${index_path}/../gatk_regions.list -T RealignerTargetCreator -known ${knownindel} -R ${reffa} -o ${pair_id}.bam.list -I ${pair_id}.split.bam -nt 8 -nct 1
-    java -Xmx32g -jar $GATK_JAR -L ${index_path}/../gatk_regions.list -I ${pair_id}.split.bam -R ${reffa} --filter_mismatching_base_and_quals -T IndelRealigner -targetIntervals ${pair_id}.bam.list -o ${pair_id}.realigned.bam
-    java -Xmx32g -jar $GATK_JAR -l INFO -R ${reffa} --knownSites ${dbsnp} -I ${pair_id}.realigned.bam -T BaseRecalibrator -cov ReadGroupCovariate -cov QualityScoreCovariate -cov CycleCovariate -cov ContextCovariate -o ${pair_id}.recal_data.grp -nt 1 -nct 8
-    java -Xmx32g -jar $GATK_JAR -L ${index_path}/../gatk_regions.list -T PrintReads -R ${reffa} -I ${pair_id}.realigned.bam -BQSR ${pair_id}.recal_data.grp -o ${pair_id}.final.bam -nt 1 -nct 8
+    java -Xmx16g -jar $GATK_JAR -L ${index_path}/../gatk_regions.list -I ${pair_id}.split.bam -R ${reffa} --filter_mismatching_base_and_quals -T IndelRealigner -targetIntervals ${pair_id}.bam.list -o ${pair_id}.realigned.bam
+    java -Xmx16g -jar $GATK_JAR -l INFO -R ${reffa} --knownSites ${dbsnp} -I ${pair_id}.realigned.bam -T BaseRecalibrator -cov ReadGroupCovariate -cov QualityScoreCovariate -cov CycleCovariate -cov ContextCovariate -o ${pair_id}.recal_data.grp -nt 1 -nct 8
+    java -Xmx16g -jar $GATK_JAR -L ${index_path}/../gatk_regions.list -T PrintReads -R ${reffa} -I ${pair_id}.realigned.bam -BQSR ${pair_id}.recal_data.grp -o ${pair_id}.final.bam -nt 1 -nct 8
 elif [[ $algo == 'gatkbam' ]]
 then
   samtools index -@ $SLURM_CPUS_ON_NODE ${sbam}
-  java -Xmx32g -jar $GATK_JAR -T RealignerTargetCreator -known ${knownindel} -R ${reffa} -o ${pair_id}.bam.list -I ${sbam} -nt 8 -nct 1
-  java -Xmx32g -jar $GATK_JAR -I ${sbam} -R ${reffa} --filter_mismatching_base_and_quals -T IndelRealigner -targetIntervals ${pair_id}.bam.list -o ${pair_id}.realigned.bam
-  java -Xmx32g -jar $GATK_JAR -l INFO -R ${reffa} --knownSites ${dbsnp} -I ${pair_id}.realigned.bam -T BaseRecalibrator -cov ReadGroupCovariate -cov QualityScoreCovariate -cov CycleCovariate -cov ContextCovariate -o ${pair_id}.recal_data.grp -nt 1 -nct 8
+  java -Xmx16g -jar $GATK_JAR -T RealignerTargetCreator -known ${knownindel} -R ${reffa} -o ${pair_id}.bam.list -I ${sbam} -nt 8 -nct 1
+  java -Xmx16g -jar $GATK_JAR -I ${sbam} -R ${reffa} --filter_mismatching_base_and_quals -T IndelRealigner -targetIntervals ${pair_id}.bam.list -o ${pair_id}.realigned.bam
+  java -Xmx16g -jar $GATK_JAR -l INFO -R ${reffa} --knownSites ${dbsnp} -I ${pair_id}.realigned.bam -T BaseRecalibrator -cov ReadGroupCovariate -cov QualityScoreCovariate -cov CycleCovariate -cov ContextCovariate -o ${pair_id}.recal_data.grp -nt 1 -nct 8
   java -Xmx16g -jar $GATK_JAR -T PrintReads -R ${reffa} -I ${pair_id}.realigned.bam -BQSR ${pair_id}.recal_data.grp -o ${pair_id}.final.bam -nt 1 -nct 8
 fi