\documentclass[9pt]{beamer}

\usetheme[progressbar=frametitle]{metropolis}
\usepackage{appendixnumberbeamer}

\usepackage{booktabs}
\usepackage[scale=2]{ccicons}
\usepackage{subcaption}
\usepackage{pgfplots}
\usepgfplotslibrary{dateplot}

\usepackage[url=false,doi=false, ISSN=false]{biblatex}
\bibliography{demo}
\usepackage{xspace}
\newcommand{\themename}{\textbf{\textsc{metropolis}}\xspace}
\setbeamertemplate{bibliography item}{\insertbiblabel}
\setbeamercolor{background canvas}{bg=white}
\setbeamercolor{block title}{bg=white}
\setbeamercolor{block body}{bg=white}
\setbeamerfont{footnote}{size=\scriptsize}
\setbeamerfont{frametitle}{size=\huge}

\title{Metropolis}
\subtitle{A modern beamer theme}
% \date{\today}
\date{}
\author{Alex Selimov}
\institute{Georgia Institute of Technology}
% \titlegraphic{\hfill\includegraphics[height=1.5cm]{logo.pdf}}

\begin{document}

\maketitle

\begin{frame}{Table of contents}
  \setbeamertemplate{section in toc}[sections numbered]
  \tableofcontents%[hideallsubsections]
\end{frame}


\begin{frame}[allowframebreaks]{References}

  \bibliography{demo}
  \bibliographystyle{abbrv}

\end{frame}

\end{document}