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Massive stellar clusters have recently been hypothesised as candidates forthe acceleration of hadronic cosmic rays up to PeV energies. Previously, theH.E.S.S. Collaboration has reported about very extended $\gamma$-ray emissionaround Westerlund 1, a massive young stellar cluster in the Milky Way. In thiscontribution we present an updated analysis that employs a new analysistechnique and is based on a much larger data set, allowing us to constrainbetter the morphology and the energy spectrum of the emission. The analysistechnique used is a three-dimensional likelihood analysis, which is especiallywell suited for largely extended sources. The origin of the $\gamma$-rayemission will be discussed in light of multi-wavelength observations.

The young massive stellar cluster Westerlund 1 in $\gamma$ rays as seen with H.E.S.S