diff --git a/ci/docker/aarch64-unknown-linux-musl/Dockerfile b/ci/docker/aarch64-unknown-linux-musl/Dockerfile
index 2790b5d8d54afdbb6599cf8bacc89b897c3b5be6..caec1572cbb91b2943b0b024fb6e30f83a4a32ca 100644
--- a/ci/docker/aarch64-unknown-linux-musl/Dockerfile
+++ b/ci/docker/aarch64-unknown-linux-musl/Dockerfile
@@ -10,14 +10,14 @@ RUN curl https://www.musl-libc.org/releases/musl-1.1.19.tar.gz | \
     ./configure --prefix=/musl-aarch64 --enable-wrapper=yes && \
     make install -j4 && \
     cd .. && \
-    rm -rf musl-1.1.19 && \
+    rm -rf musl-1.1.19
 # Install linux kernel headers sanitized for use with musl
-    curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-5.tar.gz | \
+RUN curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-6.tar.gz | \
     tar xzf - && \
-    cd kernel-headers-3.12.6-5 && \
+    cd kernel-headers-3.12.6-6 && \
     make ARCH=arm64 prefix=/musl-aarch64 install -j4 && \
     cd .. && \
-    rm -rf kernel-headers-3.12.6-5
+    rm -rf kernel-headers-3.12.6-6
 
 # FIXME: shouldn't need the `-lgcc` here, shouldn't that be in libstd?
 ENV PATH=$PATH:/musl-aarch64/bin:/rust/bin \
diff --git a/ci/docker/arm-unknown-linux-musleabihf/Dockerfile b/ci/docker/arm-unknown-linux-musleabihf/Dockerfile
index 29ec440058983aba151fce69661523045ef17140..86304130fe3010688048fdf08246d2810078764b 100644
--- a/ci/docker/arm-unknown-linux-musleabihf/Dockerfile
+++ b/ci/docker/arm-unknown-linux-musleabihf/Dockerfile
@@ -12,13 +12,13 @@ RUN CC=arm-linux-gnueabihf-gcc \
 RUN make install -j4
 
 # Install linux kernel headers sanitized for use with musl
-RUN \
-    curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-5.tar.gz | \
+RUN curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-6.tar.gz | \
     tar xzf - && \
-    cd kernel-headers-3.12.6-5 && \
+    cd kernel-headers-3.12.6-6 && \
     make ARCH=arm prefix=/musl-arm install -j4 && \
     cd .. && \
-    rm -rf kernel-headers-3.12.6-5
+    rm -rf kernel-headers-3.12.6-6
+
 ENV PATH=$PATH:/musl-arm/bin:/rust/bin \
     CC_arm_unknown_linux_musleabihf=musl-gcc \
     CARGO_TARGET_ARM_UNKNOWN_LINUX_MUSLEABIHF_LINKER=musl-gcc \
diff --git a/ci/docker/i686-unknown-linux-musl/Dockerfile b/ci/docker/i686-unknown-linux-musl/Dockerfile
index 5fa7b3127b2083e57693be7f93e77e158660dbf9..49f37d70f2affa1a252268907e475b243c4a5686 100644
--- a/ci/docker/i686-unknown-linux-musl/Dockerfile
+++ b/ci/docker/i686-unknown-linux-musl/Dockerfile
@@ -18,13 +18,14 @@ RUN curl https://www.musl-libc.org/releases/musl-1.1.19.tar.gz | \
     CC=gcc CFLAGS=-m32 ./configure --prefix=/musl-i686 --disable-shared --target=i686 && \
     make CROSS_COMPILE= install -j4 && \
     cd .. && \
-    rm -rf musl-1.1.19 && \
+    rm -rf musl-1.1.19
 # Install linux kernel headers sanitized for use with musl
-    curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-5.tar.gz | \
+RUN curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-6.tar.gz | \
     tar xzf - && \
-    cd kernel-headers-3.12.6-5 && \
+    cd kernel-headers-3.12.6-6 && \
     make ARCH=i386 prefix=/musl-i686 install -j4 && \
     cd .. && \
-    rm -rf kernel-headers-3.12.6-5
+    rm -rf kernel-headers-3.12.6-6
+
 ENV PATH=$PATH:/musl-i686/bin:/rust/bin \
     CC_i686_unknown_linux_musl=musl-gcc
diff --git a/ci/docker/x86_64-unknown-linux-musl/Dockerfile b/ci/docker/x86_64-unknown-linux-musl/Dockerfile
index 8ebf9348ca627c72a6ba23b02a5856d3804913cd..6e2b7d9e5ea78060f86e0ed41e91804c34a0df40 100644
--- a/ci/docker/x86_64-unknown-linux-musl/Dockerfile
+++ b/ci/docker/x86_64-unknown-linux-musl/Dockerfile
@@ -9,12 +9,12 @@ RUN curl https://www.musl-libc.org/releases/musl-1.1.19.tar.gz | \
     ./configure --prefix=/musl-x86_64 && \
     make install -j4 && \
     cd .. && \
-    rm -rf musl-1.1.19 && \
+    rm -rf musl-1.1.19
 # Install linux kernel headers sanitized for use with musl
-    curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-5.tar.gz | \
+RUN curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-6.tar.gz | \
     tar xzf - && \
-    cd kernel-headers-3.12.6-5 && \
+    cd kernel-headers-3.12.6-6 && \
     make ARCH=x86_64 prefix=/musl-x86_64 install -j4 && \
     cd .. && \
-    rm -rf kernel-headers-3.12.6-5
+    rm -rf kernel-headers-3.12.6-6
 ENV PATH=$PATH:/musl-x86_64/bin:/rust/bin