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In this paper, we analyze the $s$-dependence of the solution $u_s$ to thefractional Poisson equation $(-\Delta)^s_{\Omega} = f$ in an open bounded set$\Omega \subset \mathbb{R}^N$. Precisely, we show that the solution map$(0,1)\to L^2(\Omega)$, $s\mapsto u_s$ is continuously differentiable.Moreover, when $f = \lambda_s u_s$, we also analyze the one-sideddifferentiability of the first nontrivial eigenvalue of $(-\Delta)^s_{\Omega}$regarded as a function of $s \in (0,1)$.

On the s-derivative of weak solutions of the Poisson problem for the regional fractional Laplacian