diff --git a/docker/Dockerfile.alpine b/docker/Dockerfile.alpine
index abf5555..e0460cf 100644
--- a/docker/Dockerfile.alpine
+++ b/docker/Dockerfile.alpine
@@ -13,6 +13,7 @@ RUN apk add --no-cache \
     openssl-libs-static \
     openssl-dev \
     zeromq-dev \
+    unbound-dev \
     libsodium-static \
     libunwind-static \
     xz-dev \