According to aspects of the present disclosure, a retaining apparatus for use with a medicament delivery device is provided. The medicament delivery device includes a container holder assembly and an actuator assembly. The container holder assembly is configured to receive a container containing a medicament. The container holder assembly is configured to couple to the actuator assembly. The actuator assembly includes a plunger rod for engaging a stopper in the container. The retaining apparatus includes a plunger lock, a retaining member, and a biasing member. The plunger lock is seated within a proximal end of the actuator assembly, and secures the plunger rod. The retaining member is seated within the plunger lock. The biasing member is secured between the proximal end of the actuator assembly and the retaining member. The retaining member is biased in a proximal direction by the biasing member.
