diff --git a/src/.docker_modules/gatk/3.8.0/Dockerfile b/src/.docker_modules/gatk/3.8.0/Dockerfile
index 2ef48edd5c589a52769ec6ee6edef38cd2b903fa..af8e30448ea39b16a558d7d4bd8f1fb7ce4b9b2d 100644
--- a/src/.docker_modules/gatk/3.8.0/Dockerfile
+++ b/src/.docker_modules/gatk/3.8.0/Dockerfile
@@ -5,4 +5,4 @@ ENV GATK_VERSION=3.8.0
 
 RUN echo "#\!/bin/sh\njava -jar /usr/GenomeAnalysisTK.jar \$@" > /bin/gatk3 
 RUN chmod +x /bin/gatk3
-RUN sed -i 's/java/java -Xmx40g/g' /bin/gatk3
+RUN sed -i 's/java/java -Xmx128g/g' /bin/gatk3