--- a/build/moz.configure/rust.configure
+++ b/build/moz.configure/rust.configure
@@ -53,17 +53,17 @@ def rust_compiler(rustc_info, cargo_info
         die(dedent('''\
         Rust compiler not found.
         To compile rust language sources, you must have 'rustc' in your path.
         See https://www.rust-lang.org/ for more information.
 
         You can install rust by running './mach bootstrap'
         or by directly running the installer from https://rustup.rs/
         '''))
-    rustc_min_version = Version('1.20.0')
+    rustc_min_version = Version('1.21.0')
     cargo_min_version = Version('0.{}'.format(rustc_min_version.minor + 1))
 
     version = rustc_info.version
     if version < rustc_min_version:
         die(dedent('''\
         Rust compiler {} is too old.
 
         To compile Rust language sources please install at least

--- a/taskcluster/ci/build/linux.yml
+++ b/taskcluster/ci/build/linux.yml
@@ -175,17 +175,17 @@ linux64-base-toolchains/opt:
             - balrog/production.py
         script: "mozharness/scripts/fx_desktop_build.py"
         secrets: true
         tooltool-downloads: public
         need-xvfb: true
     toolchains:
         - linux64-clang-3.9
         - linux64-gcc-4.9
-        - linux64-rust-1.20
+        - linux64-rust-1.21
         - linux64-sccache
 
 linux64-base-toolchains/debug:
     description: "Linux64 base toolchains Debug"
     index:
         product: firefox
         job-name: linux64-base-toolchains-debug
     treeherder:
@@ -206,17 +206,17 @@ linux64-base-toolchains/debug:
         script: "mozharness/scripts/fx_desktop_build.py"
         secrets: true
         custom-build-variant-cfg: debug
         tooltool-downloads: public
         need-xvfb: true
     toolchains:
         - linux64-clang-3.9
         - linux64-gcc-4.9
-        - linux64-rust-1.20
+        - linux64-rust-1.21
         - linux64-sccache
 
 linux/opt:
     description: "Linux32 Opt"
     index:
         product: firefox
         job-name: linux-opt
     treeherder:

--- a/taskcluster/ci/toolchain/linux.yml
+++ b/taskcluster/ci/toolchain/linux.yml
@@ -318,40 +318,16 @@ linux64-rust-1.21:
             '--channel', '1.21.0',
             '--host', 'x86_64-unknown-linux-gnu',
             '--target', 'x86_64-unknown-linux-gnu',
             '--target', 'i686-unknown-linux-gnu',
         ]
         toolchain-alias: linux64-rust
         toolchain-artifact: public/build/rustc.tar.xz
 
-linux64-rust-1.20:
-    description: "rust repack"
-    treeherder:
-        kind: build
-        platform: toolchains/opt
-        symbol: TL(rust-1.20)
-        tier: 1
-    worker-type: aws-provisioner-v1/gecko-{level}-b-linux
-    worker:
-        docker-image: {in-tree: desktop-build}
-        max-run-time: 7200
-        env:
-          UPLOAD_DIR: artifacts
-    run:
-        using: toolchain-script
-        script: repack_rust.py
-        arguments: [
-            '--channel', '1.20.0',
-            '--host', 'x86_64-unknown-linux-gnu',
-            '--target', 'x86_64-unknown-linux-gnu',
-            '--target', 'i686-unknown-linux-gnu',
-        ]
-        toolchain-artifact: public/build/rustc.tar.xz
-
 linux64-rust-1.19:
     description: "rust repack"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TL(rust-1.19)
         tier: 1
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux