\usepackage{fontspec}
\usepackage{unicode-math}

% Set the main Roman text font to Computer Modern Unicode (or Concrete text)
\setmainfont{cmunorm.otf}[
    BoldFont = cmunobx.otf,
    ItalicFont = cmunoti.otf,
    BoldItalicFont = cmunobi.otf
]

% Set the Concrete Math font
\setmathfont{Concrete-Math.otf}

%make integral sign upright
\setmathfont{NewCMMath-Regular.otf}[
  range={"222B-"2233, "2A0C-"2A1C},
  StylisticSet=2
]
