The present invention relates to a conjugate or a pharmaceutically acceptable salt thereof comprising an GLP-1/Glucagon/GIP triple receptor agonist, a linker and a hyaluronic acid hydrogel bearing -L1-L2-L-Y-R2 groups, wherein Y represents an GLP-1/Glucagon/GIP triple receptor agonist moiety; and -L is a linker moiety—by formula (Ia), wherein the dashed line indicates the attachment to one of the amino groups of the GLP-1/Glucagon/GIP triple receptor agonist moiety by forming an amide bond. The invention further relates to pharmaceutical compositions comprising said conjugates as well as their use as a medicament for treating or preventing diseases or disorders which can be treated by GLP-1/Glucagon/GIP triple receptor agonist.