diff --git a/Dockerfile b/Dockerfile
index 1296345ef4f..2f666c2802f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -89,7 +89,8 @@ ENV CLASSPATH /gatk/gatk.jar:$CLASSPATH
 
 WORKDIR /gatk
 ENV PATH $CONDA_PATH/envs/gatk/bin:$CONDA_PATH/bin:$PATH
-RUN conda env create -n gatk -f /gatk/gatkcondaenv.yml && \
+RUN conda install -c conda-forge mamba=1.5.3
+RUN mamba create -n gatk --file /gatk/gatkcondaenv.yml && \
     echo "source activate gatk" >> /gatk/gatkenv.rc && \
     echo "source /gatk/gatk-completion.sh" >> /gatk/gatkenv.rc && \
     conda clean -afy && \