diff --git a/alpine/Dockerfile b/alpine/Dockerfile
index b30c180..c6a071c 100644
--- a/alpine/Dockerfile
+++ b/alpine/Dockerfile
@@ -17,7 +17,7 @@ RUN echo "==> Installing dependencies..." \
  && mkdir -p /root/ngx_openresty \
  && cd /root/ngx_openresty \
  && echo "==> Downloading OpenResty..." \
- && curl -sSL http://openresty.org/download/openresty-${OPENRESTY_VERSION}.tar.gz | tar -xvz \
+ && curl -sSL https://openresty.org/download/openresty-${OPENRESTY_VERSION}.tar.gz | tar -xvz \
  && cd openresty-* \
  && echo "==> Configuring OpenResty..." \
  && readonly NPROC=$(grep -c ^processor /proc/cpuinfo 2>/dev/null || 1) \
diff --git a/debian/Dockerfile b/debian/Dockerfile
index 266cd22..ab7df6f 100644
--- a/debian/Dockerfile
+++ b/debian/Dockerfile
@@ -16,7 +16,7 @@ ENV VAR_PREFIX /var/nginx
 
 RUN cd /root \
  && echo "==> Downloading OpenResty..." \
- && curl -sSL http://openresty.org/download/openresty-${OPENRESTY_VERSION}.tar.gz | tar -xvz \
+ && curl -sSL https://openresty.org/download/openresty-${OPENRESTY_VERSION}.tar.gz | tar -xvz \
  && echo "==> Configuring OpenResty..." \
  && cd openresty-* \
  && readonly NPROC=$(grep -c ^processor /proc/cpuinfo 2>/dev/null || 1) \