We prove that for any graph $G$ of maximum degree at most $Δ$, the zeros of its chromatic polynomial $χ_G(z)$ (in $\mathbb{C}$) lie outside the disk of radius $5.02 Δ$ centered at $0$. This improves on the previously best known bound of approximately $6.91Δ$. In the case of graphs of high girth we can improve this. We prove that for every $g$ there is a constant $K_g$ such that for any graph $G$ of maximum degree at most $Δ$ and girth at least $g$, the zeros of its chromatic polynomial $χ_G(z)$ lie outside the disk of radius $K_g Δ$ centered at $0$ where $K_g \to 1 + e \approx 3.72$ as $g \to \infty$. Finally, we give improved bounds on the Fisher zeros of the partition function of the Ising model.