--- a/build/moz.configure/rust.configure
+++ b/build/moz.configure/rust.configure
@@ -62,17 +62,17 @@ 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('1.26.0')
+    rustc_min_version = Version('1.27.0')
     cargo_min_version = rustc_min_version
 
     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/python/mozboot/mozboot/base.py
+++ b/python/mozboot/mozboot/base.py
@@ -145,17 +145,17 @@ ac_add_options --enable-artifact-builds
 # This should match OLDEST_NON_LEGACY_VERSION from
 # the hg setup wizard in version-control-tools.
 MODERN_MERCURIAL_VERSION = LooseVersion('4.3.3')
 
 # Upgrade Python older than this.
 MODERN_PYTHON_VERSION = LooseVersion('2.7.3')
 
 # Upgrade rust older than this.
-MODERN_RUST_VERSION = LooseVersion('1.26.0')
+MODERN_RUST_VERSION = LooseVersion('1.27.0')
 
 
 class BaseBootstrapper(object):
     """Base class for system bootstrappers."""
 
     def __init__(self, no_interactive=False):
         self.package_manager_updated = False
         self.no_interactive = no_interactive

--- a/taskcluster/ci/build/linux.yml
+++ b/taskcluster/ci/build/linux.yml
@@ -260,17 +260,17 @@ linux64-base-toolchains/opt:
             - builds/releng_base_linux_64_builds.py
         script: "mozharness/scripts/fx_desktop_build.py"
         secrets: true
         tooltool-downloads: public
         need-xvfb: true
     toolchains:
         - linux64-clang-3.9
         - linux64-gcc-6
-        - linux64-rust-1.26
+        - linux64-rust-1.27
         - linux64-sccache
 
 linux64-base-toolchains/debug:
     description: "Linux64 base toolchains Debug"
     index:
         product: firefox
         job-name: linux64-base-toolchains-debug
     treeherder:
@@ -290,17 +290,17 @@ 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-6
-        - linux64-rust-1.26
+        - linux64-rust-1.27
         - 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
@@ -386,33 +386,33 @@ linux64-android-gradle-dependencies:
             - 'mobile/android/config/mozconfigs/common*'
             - 'mobile/android/gradle.configure'
         toolchain-artifact: public/build/android-gradle-dependencies.tar.xz
         toolchain-alias: android-gradle-dependencies
     toolchains:
         # Aliases aren't allowed for toolchains depending on toolchains.
         - linux64-android-sdk-linux-repack
 
-linux64-rust-1.26:
+linux64-rust-1.27:
     description: "rust repack"
     treeherder:
         kind: build
         platform: toolchains/opt
-        symbol: TL(rust-1.26)
+        symbol: TL(rust-1.27)
         tier: 1
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
         max-run-time: 7200
         env:
             UPLOAD_DIR: artifacts
     run:
         using: toolchain-script
         script: repack_rust.py
         arguments: [
-            '--channel', '1.26.2',
+            '--channel', '1.27.0',
             '--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-1.28:
     description: "rust repack"