Timber members typically present very low tensile strength perpendicular to the wood fibres and failure under such stresses is highly brittle. Bolted connections between timber members are particularly sensitive to this issue that often leads to their premature failure. In this ongoing exploratory study, fibre-reinforced polymer (FRP) composites are used as a highly tailorable and material-adapted solution for the local reinforcement of bolted timber connections. Commercial spruce GL24h strength class glued laminated timber (GLT) members are reinforced with pre-cured FRP composite plates adhesively bonded to their outer surfaces at the connection sections and connected according to different configurations. Composite plates produced by vacuum infusion using a partially bio-based epoxy resin and two alternative fibre types (flax and glass) are adopted. The composite plates are bonded to the timber members using an epoxy-based structural adhesive. The connections between timber members are made using steel plate connectors and steel bolts. The reinforced connections are tested under monotonic tensile loading and compared to unreinforced connections (i.e., using identical materials and configurations, but without the adhesively bonded FRP reinforcement plates) regarding their failure modes, force-slip responses, local deformations at the connections, and load capacity. This novel technology is expected to lead to significantly improved overall performance of connections between timber members, enabling more economical and efficient designs for mass timber construction.