diff --git a/0.11/Dockerfile b/0.11/Dockerfile
index f5bf967..28d0f73 100644
--- a/0.11/Dockerfile
+++ b/0.11/Dockerfile
@@ -11,7 +11,15 @@ RUN apt-get update -y \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4
+RUN set -ex \
+  && for key in \
+    B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+  ; do \
+    gpg --keyserver pgp.mit.edu --recv-keys "$key" || \
+    gpg --keyserver keyserver.pgp.com --recv-keys "$key" || \
+    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" || \
+    gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" ; \
+  done
 
 RUN curl -o /usr/local/bin/gosu -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture) \
 	&& curl -o /usr/local/bin/gosu.asc -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture).asc \
diff --git a/0.12/Dockerfile b/0.12/Dockerfile
index 12d46f0..ee00586 100644
--- a/0.12/Dockerfile
+++ b/0.12/Dockerfile
@@ -11,7 +11,15 @@ RUN apt-get update -y \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4
+RUN set -ex \
+  && for key in \
+    B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+  ; do \
+    gpg --keyserver pgp.mit.edu --recv-keys "$key" || \
+    gpg --keyserver keyserver.pgp.com --recv-keys "$key" || \
+    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" || \
+    gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" ; \
+  done
 
 RUN curl -o /usr/local/bin/gosu -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture) \
 	&& curl -o /usr/local/bin/gosu.asc -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture).asc \
diff --git a/0.13/Dockerfile b/0.13/Dockerfile
index 25382fe..32dc6a4 100644
--- a/0.13/Dockerfile
+++ b/0.13/Dockerfile
@@ -11,7 +11,15 @@ RUN apt-get update -y \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4
+RUN set -ex \
+  && for key in \
+    B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+  ; do \
+    gpg --keyserver pgp.mit.edu --recv-keys "$key" || \
+    gpg --keyserver keyserver.pgp.com --recv-keys "$key" || \
+    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" || \
+    gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" ; \
+  done
 
 RUN curl -o /usr/local/bin/gosu -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture) \
 	&& curl -o /usr/local/bin/gosu.asc -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture).asc \
diff --git a/0.14/Dockerfile b/0.14/Dockerfile
index 79c3e1b..db38bb5 100644
--- a/0.14/Dockerfile
+++ b/0.14/Dockerfile
@@ -11,7 +11,15 @@ RUN apt-get update -y \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4
+RUN set -ex \
+  && for key in \
+    B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+  ; do \
+    gpg --keyserver pgp.mit.edu --recv-keys "$key" || \
+    gpg --keyserver keyserver.pgp.com --recv-keys "$key" || \
+    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" || \
+    gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" ; \
+  done
 
 RUN curl -o /usr/local/bin/gosu -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture) \
 	&& curl -o /usr/local/bin/gosu.asc -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture).asc \
diff --git a/0.15/Dockerfile b/0.15/Dockerfile
index f1cc134..63be77d 100644
--- a/0.15/Dockerfile
+++ b/0.15/Dockerfile
@@ -11,7 +11,15 @@ RUN apt-get update -y \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4
+RUN set -ex \
+  && for key in \
+    B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+  ; do \
+    gpg --keyserver pgp.mit.edu --recv-keys "$key" || \
+    gpg --keyserver keyserver.pgp.com --recv-keys "$key" || \
+    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" || \
+    gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" ; \
+  done
 
 RUN curl -o /usr/local/bin/gosu -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture) \
 	&& curl -o /usr/local/bin/gosu.asc -fSL https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-$(dpkg --print-architecture).asc \