diff --git a/dockerfiles/Dockerfile-centos b/dockerfiles/Dockerfile-centos
index 800e743..cf29f1f 100644
--- a/dockerfiles/Dockerfile-centos
+++ b/dockerfiles/Dockerfile-centos
@@ -32,7 +32,7 @@ RUN set -x \
        fi \
     && mkdir /tmp/packages \
     && tar xf /tmp/wheels.tar.gz -C /tmp/packages/ --strip-components=2 root/packages \
-    && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
+    && curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
     && python get-pip.py \
     && rm get-pip.py \
     && pip install virtualenv \
diff --git a/dockerfiles/Dockerfile-debian b/dockerfiles/Dockerfile-debian
index e33ebc1..ac34c76 100644
--- a/dockerfiles/Dockerfile-debian
+++ b/dockerfiles/Dockerfile-debian
@@ -33,7 +33,7 @@ RUN set -x \
        fi \
     && mkdir /tmp/packages \
     && tar xf /tmp/wheels.tar.gz -C /tmp/packages/ --strip-components=2 root/packages \
-    && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
+    && curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
     && python get-pip.py \
     && rm get-pip.py \
     && pip install virtualenv \
diff --git a/dockerfiles/Dockerfile-ubuntu b/dockerfiles/Dockerfile-ubuntu
index b285bdb..0293af9 100644
--- a/dockerfiles/Dockerfile-ubuntu
+++ b/dockerfiles/Dockerfile-ubuntu
@@ -33,7 +33,7 @@ RUN set -x \
        fi \
     && mkdir /tmp/packages \
     && tar xf /tmp/wheels.tar.gz -C /tmp/packages/ --strip-components=2 root/packages \
-    && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
+    && curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
     && python get-pip.py \
     && rm get-pip.py \
     && pip install virtualenv \
diff --git a/update.sh b/update.sh
index 1391207..54c61f3 100755
--- a/update.sh
+++ b/update.sh
@@ -21,7 +21,7 @@ COMMON_INSTALL=$(cat <<'END_HEREDOC'
        fi \\\n\
     && mkdir /tmp/packages \\\n\
     && tar xf /tmp/wheels.tar.gz -C /tmp/packages/ --strip-components=2 root/packages \\\n\
-    && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py \\\n\
+    && curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py \\\n\
     && python get-pip.py \\\n\
     && rm get-pip.py \\\n\
     && pip install virtualenv \\\n\