  The energy evolution of the fluctuating proton structure is studied by
solving the JIMWLK renormalization group equation. The initial condition at
moderate $x$ is obtained by fitting the charm reduced cross section data from
HERA, requiring that the proton size remains compatible with the diffractive
vector meson production measurements. Additionally, we show that the nucleon
shape fluctuations are visible in exclusive vector meson production off nuclei.
