--- a/taskcluster/ci/toolchain/linux.yml
+++ b/taskcluster/ci/toolchain/linux.yml
@@ -377,104 +377,81 @@ 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-1.25:
+linux64-rust-1.24:
     description: "rust repack"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TL(rust)
         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', '1.25.0',
+            '--channel', '1.24.0',
             '--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-1.24:
-    description: "rust repack"
-    treeherder:
-        kind: build
-        platform: toolchains/opt
-        symbol: TL(rust-1.24)
-        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', '1.24.0',
-            '--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-macos-1.25:
+linux64-rust-macos-1.24:
     description: "rust repack with macos-cross support"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TL(rust-macos)
         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', '1.25.0',
+            '--channel', '1.24.0',
             '--host', 'x86_64-unknown-linux-gnu',
             '--target', 'x86_64-unknown-linux-gnu',
             '--target', 'x86_64-apple-darwin',
         ]
         toolchain-alias: linux64-rust-macos
         toolchain-artifact: public/build/rustc.tar.xz
 
-linux64-rust-android-1.25:
+linux64-rust-android-1.24:
     description: "rust repack with android-cross support"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TL(rust-android)
         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', '1.25.0',
+            '--channel', '1.24.0',
             '--host', 'x86_64-unknown-linux-gnu',
             '--target', 'x86_64-unknown-linux-gnu',
             '--target', 'armv7-linux-androideabi',
             '--target', 'aarch64-linux-android',
             '--target', 'i686-linux-android',
         ]
         toolchain-alias: linux64-rust-android
         toolchain-artifact: public/build/rustc.tar.xz
@@ -491,17 +468,17 @@ linux64-sccache:
         max-run-time: 36000
     run:
         using: toolchain-script
         script: build-sccache.sh
         resources:
             - 'taskcluster/scripts/misc/tooltool-download.sh'
         toolchain-artifact: public/build/sccache2.tar.xz
     toolchains:
-        - linux64-rust-1.25
+        - linux64-rust-1.24
 
 linux64-gn:
     description: "gn toolchain build"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TL(gn)
         tier: 1

--- a/taskcluster/ci/toolchain/windows.yml
+++ b/taskcluster/ci/toolchain/windows.yml
@@ -113,83 +113,83 @@ win64-clang-tidy:
         script: build-clang-tidy64-windows.sh
         resources:
             - 'build/clang-plugin/**'
             - 'build/build-clang/build-clang.py'
             - 'build/build-clang/clang-tidy-win32.json'
             - 'taskcluster/scripts/misc/build-clang-windows-helper64.sh'
         toolchain-artifact: public/build/clang-tidy.tar.bz2
 
-win64-rust-1.25:
+win64-rust-1.24:
     description: "rust repack"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TW64(rust)
         tier: 1
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
         docker-image: {in-tree: toolchain-build}
         max-run-time: 7200
         env:
             UPLOAD_DIR: artifacts
     run:
         using: toolchain-script
         script: repack_rust.py
         arguments: [
-            '--channel', '1.25.0',
+            '--channel', '1.24.0',
             '--host', 'x86_64-pc-windows-msvc',
             '--target', 'x86_64-pc-windows-msvc',
             '--target', 'i686-pc-windows-msvc',
         ]
         toolchain-alias: win64-rust
         toolchain-artifact: public/build/rustc.tar.bz2
 
-win32-rust-1.25:
+win32-rust-1.24:
     description: "rust repack"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TW32(rust)
         tier: 1
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
         docker-image: {in-tree: toolchain-build}
         max-run-time: 7200
         env:
             UPLOAD_DIR: artifacts
     run:
         using: toolchain-script
         script: repack_rust.py
         arguments: [
-            '--channel', '1.25.0',
+            '--channel', '1.24.0',
             '--host', 'i686-pc-windows-msvc',
             '--target', 'i686-pc-windows-msvc',
         ]
         toolchain-alias: win32-rust
         toolchain-artifact: public/build/rustc.tar.bz2
 
-mingw32-rust-1.25:
+mingw32-rust-1.24:
     description: "rust repack"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TMW(rust)
         tier: 1
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
         docker-image: {in-tree: toolchain-build}
         max-run-time: 7200
         env:
             UPLOAD_DIR: artifacts
     run:
         using: toolchain-script
         script: repack_rust.py
         arguments: [
-            '--channel', '1.25.0',
+            '--channel', '1.24.0',
             '--host', 'i686-unknown-linux-gnu',
             '--target', 'i686-pc-windows-gnu',
             '--target', 'x86_64-unknown-linux-gnu',
             '--target', 'i686-unknown-linux-gnu',
         ]
         toolchain-alias: mingw32-rust
         toolchain-artifact: public/build/rustc.tar.xz
 
@@ -207,17 +207,17 @@ win64-sccache:
             TOOLTOOL_MANIFEST: "browser/config/tooltool-manifests/win64/sccache-build.manifest"
     run:
         using: toolchain-script
         script: build-sccache.sh
         resources:
             - 'taskcluster/scripts/misc/tooltool-download.sh'
         toolchain-artifact: public/build/sccache2.tar.bz2
     toolchains:
-        - win64-rust-1.25
+        - win64-rust-1.24
 
 win32-gn:
     description: "gn toolchain build"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TW32(gn)
         tier: 1