diff --git a/Cargo.lock b/Cargo.lock
index 1b37fe8e2df..6575f1385da 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -619,9 +619,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.50"
+version = "1.0.65"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95e28fa049fda1c330bcf9d723be7663a899c4679724b34c81e9f5a326aab8cd"
+checksum = "95752358c8f7552394baf48cd82695b345628ad3f170d607de3ca03b8dacca15"
 dependencies = [
  "jobserver",
 ]
diff --git a/etc/taskcluster/docker/build.dockerfile b/etc/taskcluster/docker/build.dockerfile
index 0d574a247b0..60ae5606cdb 100644
--- a/etc/taskcluster/docker/build.dockerfile
+++ b/etc/taskcluster/docker/build.dockerfile
@@ -46,10 +46,8 @@ RUN \
     #
     # Install the version of rustup that is current when this Docker image is being built:
     # We want at least 1.21 (increment in this comment to force an image rebuild).
-    curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain none --profile=minimal -y && \
+    curl https://sh.rustup.rs -sSf | sh -s -- --profile=minimal -y && \
     #
-    #
-    curl -sSfL \
-        https://github.com/mozilla/sccache/releases/download/0.2.12/sccache-0.2.12-x86_64-unknown-linux-musl.tar.gz \
-        | tar -xz --strip-components=1 -C /usr/local/bin/ \
-            sccache-0.2.12-x86_64-unknown-linux-musl/sccache
+    # There are no sccache binary releases that include this commit, so we install a particular
+    # git commit instead.
+    ~/.cargo/bin/cargo install sccache --git https://github.com/mozilla/sccache/ --rev e66c9c15142a7e583d6ab80bd614bdffb2ebcc47