diff --git a/.travis.yml b/.travis.yml
index 4fcf6f02def..190cb3380a1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -63,7 +63,7 @@ matrix:
       os: osx
       osx_image: xcode8.2
       install: &osx_install_sccache >
-        travis_retry curl -o /usr/local/bin/sccache https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-apple-darwin &&
+        travis_retry curl -o /usr/local/bin/sccache https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-apple-darwin &&
           chmod +x /usr/local/bin/sccache &&
         travis_retry curl -o /usr/local/bin/stamp https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-03-17-stamp-x86_64-apple-darwin &&
           chmod +x /usr/local/bin/stamp
diff --git a/appveyor.yml b/appveyor.yml
index 8ace91c3d89..42c6256a95a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -124,8 +124,8 @@ install:
   - set PATH=C:\Python27;%PATH%
 
   # Download and install sccache
-  - appveyor-retry appveyor DownloadFile https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-pc-windows-msvc
-  - mv 2017-04-29-sccache-x86_64-pc-windows-msvc sccache.exe
+  - appveyor-retry appveyor DownloadFile https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-pc-windows-msvc
+  - mv 2017-05-12-sccache-x86_64-pc-windows-msvc sccache.exe
   - set PATH=%PATH%;%CD%
 
   # Download and install ninja
diff --git a/src/ci/docker/arm-android/Dockerfile b/src/ci/docker/arm-android/Dockerfile
index 86f0cc5d467..93f15baf55e 100644
--- a/src/ci/docker/arm-android/Dockerfile
+++ b/src/ci/docker/arm-android/Dockerfile
@@ -21,7 +21,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
     rm dumb-init_*.deb
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
     chmod +x /usr/local/bin/sccache
 
 # Install NDK
diff --git a/src/ci/docker/armhf-gnu/Dockerfile b/src/ci/docker/armhf-gnu/Dockerfile
index 5dfdf093081..801de69a63d 100644
--- a/src/ci/docker/armhf-gnu/Dockerfile
+++ b/src/ci/docker/armhf-gnu/Dockerfile
@@ -74,7 +74,7 @@ RUN arm-linux-gnueabihf-gcc addentropy.c -o rootfs/addentropy -static
 RUN curl -O http://ftp.nl.debian.org/debian/dists/jessie/main/installer-armhf/current/images/device-tree/vexpress-v2p-ca15-tc1.dtb
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/cross/Dockerfile b/src/ci/docker/cross/Dockerfile
index 5de00d5b021..30a699c3ba2 100644
--- a/src/ci/docker/cross/Dockerfile
+++ b/src/ci/docker/cross/Dockerfile
@@ -22,7 +22,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   pkg-config
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/disabled/dist-aarch64-android/Dockerfile b/src/ci/docker/disabled/dist-aarch64-android/Dockerfile
index 34e112a1f4f..e15876edbd8 100644
--- a/src/ci/docker/disabled/dist-aarch64-android/Dockerfile
+++ b/src/ci/docker/disabled/dist-aarch64-android/Dockerfile
@@ -21,7 +21,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
     rm dumb-init_*.deb
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
diff --git a/src/ci/docker/disabled/dist-armv7-android/Dockerfile b/src/ci/docker/disabled/dist-armv7-android/Dockerfile
index 34468969b88..0d81e404b5c 100644
--- a/src/ci/docker/disabled/dist-armv7-android/Dockerfile
+++ b/src/ci/docker/disabled/dist-armv7-android/Dockerfile
@@ -21,7 +21,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
     rm dumb-init_*.deb
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
diff --git a/src/ci/docker/disabled/dist-i686-android/Dockerfile b/src/ci/docker/disabled/dist-i686-android/Dockerfile
index cb9c76b2281..37930639b8a 100644
--- a/src/ci/docker/disabled/dist-i686-android/Dockerfile
+++ b/src/ci/docker/disabled/dist-i686-android/Dockerfile
@@ -21,7 +21,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
     rm dumb-init_*.deb
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
diff --git a/src/ci/docker/disabled/dist-x86_64-android/Dockerfile b/src/ci/docker/disabled/dist-x86_64-android/Dockerfile
index 11a80abf8f9..a642d8ed6ec 100644
--- a/src/ci/docker/disabled/dist-x86_64-android/Dockerfile
+++ b/src/ci/docker/disabled/dist-x86_64-android/Dockerfile
@@ -21,7 +21,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
     rm dumb-init_*.deb
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
diff --git a/src/ci/docker/dist-aarch64-linux/Dockerfile b/src/ci/docker/dist-aarch64-linux/Dockerfile
index a694bf84b18..c8257c05acd 100644
--- a/src/ci/docker/dist-aarch64-linux/Dockerfile
+++ b/src/ci/docker/dist-aarch64-linux/Dockerfile
@@ -62,7 +62,7 @@ RUN ./build-toolchains.sh
 USER root
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV PATH=$PATH:/x-tools/aarch64-unknown-linux-gnueabi/bin
diff --git a/src/ci/docker/dist-android/Dockerfile b/src/ci/docker/dist-android/Dockerfile
index a3658225bc4..711c0ee5747 100644
--- a/src/ci/docker/dist-android/Dockerfile
+++ b/src/ci/docker/dist-android/Dockerfile
@@ -21,7 +21,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
     rm dumb-init_*.deb
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
     chmod +x /usr/local/bin/sccache
 
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
diff --git a/src/ci/docker/dist-arm-linux/Dockerfile b/src/ci/docker/dist-arm-linux/Dockerfile
index 3ee18311572..af2b58f7d6b 100644
--- a/src/ci/docker/dist-arm-linux/Dockerfile
+++ b/src/ci/docker/dist-arm-linux/Dockerfile
@@ -62,7 +62,7 @@ RUN ./build-toolchains.sh
 USER root
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV PATH=$PATH:/x-tools/arm-unknown-linux-gnueabi/bin
diff --git a/src/ci/docker/dist-armhf-linux/Dockerfile b/src/ci/docker/dist-armhf-linux/Dockerfile
index 902e2e7e6e1..076bc50946c 100644
--- a/src/ci/docker/dist-armhf-linux/Dockerfile
+++ b/src/ci/docker/dist-armhf-linux/Dockerfile
@@ -62,7 +62,7 @@ RUN ./build-toolchains.sh
 USER root
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV PATH=$PATH:/x-tools/arm-unknown-linux-gnueabihf/bin
diff --git a/src/ci/docker/dist-armv7-linux/Dockerfile b/src/ci/docker/dist-armv7-linux/Dockerfile
index d6a66c2f4a3..9367a5a6270 100644
--- a/src/ci/docker/dist-armv7-linux/Dockerfile
+++ b/src/ci/docker/dist-armv7-linux/Dockerfile
@@ -62,7 +62,7 @@ RUN ./build-toolchains.sh
 USER root
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV PATH=$PATH:/x-tools/armv7-unknown-linux-gnueabihf/bin
diff --git a/src/ci/docker/dist-fuchsia/Dockerfile b/src/ci/docker/dist-fuchsia/Dockerfile
index b079f12f7e5..8699e0d87d7 100644
--- a/src/ci/docker/dist-fuchsia/Dockerfile
+++ b/src/ci/docker/dist-fuchsia/Dockerfile
@@ -30,7 +30,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV \
diff --git a/src/ci/docker/dist-i586-gnu-i686-musl/Dockerfile b/src/ci/docker/dist-i586-gnu-i686-musl/Dockerfile
index 6ea7db03cd5..3e823339eaa 100644
--- a/src/ci/docker/dist-i586-gnu-i686-musl/Dockerfile
+++ b/src/ci/docker/dist-i586-gnu-i686-musl/Dockerfile
@@ -26,7 +26,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV RUST_CONFIGURE_ARGS \
diff --git a/src/ci/docker/dist-i686-freebsd/Dockerfile b/src/ci/docker/dist-i686-freebsd/Dockerfile
index b9e5f91b373..a1f36257f96 100644
--- a/src/ci/docker/dist-i686-freebsd/Dockerfile
+++ b/src/ci/docker/dist-i686-freebsd/Dockerfile
@@ -25,7 +25,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV \
diff --git a/src/ci/docker/dist-i686-linux/Dockerfile b/src/ci/docker/dist-i686-linux/Dockerfile
index a15d6c4e53d..8335147de60 100644
--- a/src/ci/docker/dist-i686-linux/Dockerfile
+++ b/src/ci/docker/dist-i686-linux/Dockerfile
@@ -82,7 +82,7 @@ RUN curl -Lo /rustroot/dumb-init \
 ENTRYPOINT ["/rustroot/dumb-init", "--"]
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV HOSTS=i686-unknown-linux-gnu
diff --git a/src/ci/docker/dist-mips-linux/Dockerfile b/src/ci/docker/dist-mips-linux/Dockerfile
index dbcdf2eb9d6..c23240f0c70 100644
--- a/src/ci/docker/dist-mips-linux/Dockerfile
+++ b/src/ci/docker/dist-mips-linux/Dockerfile
@@ -17,7 +17,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   pkg-config
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/dist-mips64-linux/Dockerfile b/src/ci/docker/dist-mips64-linux/Dockerfile
index d0e59253a0f..415dca99d95 100644
--- a/src/ci/docker/dist-mips64-linux/Dockerfile
+++ b/src/ci/docker/dist-mips64-linux/Dockerfile
@@ -17,7 +17,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   pkg-config
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/dist-mips64el-linux/Dockerfile b/src/ci/docker/dist-mips64el-linux/Dockerfile
index 6645d0cbaad..2aba5f615ba 100644
--- a/src/ci/docker/dist-mips64el-linux/Dockerfile
+++ b/src/ci/docker/dist-mips64el-linux/Dockerfile
@@ -17,7 +17,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   pkg-config
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/dist-mipsel-linux/Dockerfile b/src/ci/docker/dist-mipsel-linux/Dockerfile
index dae1972e496..d15e3010863 100644
--- a/src/ci/docker/dist-mipsel-linux/Dockerfile
+++ b/src/ci/docker/dist-mipsel-linux/Dockerfile
@@ -17,7 +17,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   pkg-config
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/dist-powerpc-linux/Dockerfile b/src/ci/docker/dist-powerpc-linux/Dockerfile
index b43bf8beb26..bff6504749e 100644
--- a/src/ci/docker/dist-powerpc-linux/Dockerfile
+++ b/src/ci/docker/dist-powerpc-linux/Dockerfile
@@ -63,7 +63,7 @@ RUN ./build-powerpc-toolchain.sh
 USER root
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV PATH=$PATH:/x-tools/powerpc-unknown-linux-gnu/bin
diff --git a/src/ci/docker/dist-powerpc64-linux/Dockerfile b/src/ci/docker/dist-powerpc64-linux/Dockerfile
index 540415e7e27..58b09fd0fa7 100644
--- a/src/ci/docker/dist-powerpc64-linux/Dockerfile
+++ b/src/ci/docker/dist-powerpc64-linux/Dockerfile
@@ -63,7 +63,7 @@ RUN ./build-powerpc64-toolchain.sh
 USER root
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV PATH=$PATH:/x-tools/powerpc64-unknown-linux-gnu/bin
diff --git a/src/ci/docker/dist-powerpc64le-linux/Dockerfile b/src/ci/docker/dist-powerpc64le-linux/Dockerfile
index 08ab0f37b62..08f1d1d7ed5 100644
--- a/src/ci/docker/dist-powerpc64le-linux/Dockerfile
+++ b/src/ci/docker/dist-powerpc64le-linux/Dockerfile
@@ -63,7 +63,7 @@ COPY shared.sh build-powerpc64le-toolchain.sh /tmp/
 RUN ./build-powerpc64le-toolchain.sh
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV \
diff --git a/src/ci/docker/dist-s390x-linux/Dockerfile b/src/ci/docker/dist-s390x-linux/Dockerfile
index a758559e0c1..5eb238fa887 100644
--- a/src/ci/docker/dist-s390x-linux/Dockerfile
+++ b/src/ci/docker/dist-s390x-linux/Dockerfile
@@ -63,7 +63,7 @@ RUN ./build-s390x-toolchain.sh
 USER root
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV PATH=$PATH:/x-tools/s390x-ibm-linux-gnu/bin
diff --git a/src/ci/docker/dist-x86_64-freebsd/Dockerfile b/src/ci/docker/dist-x86_64-freebsd/Dockerfile
index 8c3e86fd9ad..0ac58468147 100644
--- a/src/ci/docker/dist-x86_64-freebsd/Dockerfile
+++ b/src/ci/docker/dist-x86_64-freebsd/Dockerfile
@@ -25,7 +25,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV \
diff --git a/src/ci/docker/dist-x86_64-linux/Dockerfile b/src/ci/docker/dist-x86_64-linux/Dockerfile
index d3db8bde039..d688bb7f8a4 100644
--- a/src/ci/docker/dist-x86_64-linux/Dockerfile
+++ b/src/ci/docker/dist-x86_64-linux/Dockerfile
@@ -82,7 +82,7 @@ RUN curl -Lo /rustroot/dumb-init \
 ENTRYPOINT ["/rustroot/dumb-init", "--"]
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV HOSTS=x86_64-unknown-linux-gnu
diff --git a/src/ci/docker/dist-x86_64-musl/Dockerfile b/src/ci/docker/dist-x86_64-musl/Dockerfile
index d58741132dc..87550641bc6 100644
--- a/src/ci/docker/dist-x86_64-musl/Dockerfile
+++ b/src/ci/docker/dist-x86_64-musl/Dockerfile
@@ -26,7 +26,7 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV RUST_CONFIGURE_ARGS \
diff --git a/src/ci/docker/dist-x86_64-netbsd/Dockerfile b/src/ci/docker/dist-x86_64-netbsd/Dockerfile
index 5c2fbbdf30f..b6d9c221c1c 100644
--- a/src/ci/docker/dist-x86_64-netbsd/Dockerfile
+++ b/src/ci/docker/dist-x86_64-netbsd/Dockerfile
@@ -62,7 +62,7 @@ RUN ./build-netbsd-toolchain.sh
 USER root
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 ENV PATH=$PATH:/x-tools/x86_64-unknown-netbsd/bin
diff --git a/src/ci/docker/emscripten/Dockerfile b/src/ci/docker/emscripten/Dockerfile
index dcbf1c73963..09657d2f892 100644
--- a/src/ci/docker/emscripten/Dockerfile
+++ b/src/ci/docker/emscripten/Dockerfile
@@ -15,7 +15,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   lib32stdc++6
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/i686-gnu-nopt/Dockerfile b/src/ci/docker/i686-gnu-nopt/Dockerfile
index 94554111104..076be8f4291 100644
--- a/src/ci/docker/i686-gnu-nopt/Dockerfile
+++ b/src/ci/docker/i686-gnu-nopt/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/i686-gnu/Dockerfile b/src/ci/docker/i686-gnu/Dockerfile
index 12c9cdf4a11..5fac0573574 100644
--- a/src/ci/docker/i686-gnu/Dockerfile
+++ b/src/ci/docker/i686-gnu/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/x86_64-gnu-aux/Dockerfile b/src/ci/docker/x86_64-gnu-aux/Dockerfile
index d1f421248df..06c7c2824fd 100644
--- a/src/ci/docker/x86_64-gnu-aux/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-aux/Dockerfile
@@ -15,7 +15,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   pkg-config
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/x86_64-gnu-debug/Dockerfile b/src/ci/docker/x86_64-gnu-debug/Dockerfile
index 86704126700..6ea54ac4db3 100644
--- a/src/ci/docker/x86_64-gnu-debug/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-debug/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/x86_64-gnu-distcheck/Dockerfile b/src/ci/docker/x86_64-gnu-distcheck/Dockerfile
index 26d1f82efcc..e24c660a8c3 100644
--- a/src/ci/docker/x86_64-gnu-distcheck/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-distcheck/Dockerfile
@@ -16,7 +16,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   pkg-config
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/x86_64-gnu-full-bootstrap/Dockerfile b/src/ci/docker/x86_64-gnu-full-bootstrap/Dockerfile
index 3626301d7e9..78035c7fe3d 100644
--- a/src/ci/docker/x86_64-gnu-full-bootstrap/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-full-bootstrap/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/x86_64-gnu-incremental/Dockerfile b/src/ci/docker/x86_64-gnu-incremental/Dockerfile
index 42b2d98d332..0aaed64e384 100644
--- a/src/ci/docker/x86_64-gnu-incremental/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-incremental/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile b/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
index 8bff767609f..7c136fa39bc 100644
--- a/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
@@ -17,7 +17,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/x86_64-gnu-nopt/Dockerfile b/src/ci/docker/x86_64-gnu-nopt/Dockerfile
index c2c1ac87879..4499736967c 100644
--- a/src/ci/docker/x86_64-gnu-nopt/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-nopt/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
diff --git a/src/ci/docker/x86_64-gnu/Dockerfile b/src/ci/docker/x86_64-gnu/Dockerfile
index 727cc84643f..de85e1ff36a 100644
--- a/src/ci/docker/x86_64-gnu/Dockerfile
+++ b/src/ci/docker/x86_64-gnu/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils
 
 RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-04-29-sccache-x86_64-unknown-linux-musl && \
+      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
       chmod +x /usr/local/bin/sccache
 
 RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \