--- a/taskcluster/ci/fetch/toolchains.yml
+++ b/taskcluster/ci/fetch/toolchains.yml
@@ -11,23 +11,23 @@ binutils-2.27:
         size: 26099568
         gpg-signature:
             sig-url: "{url}.sig"
             key-path: build/unix/build-gcc/EAF1C276A747E9ED86210CBAC3126D3B4AE55E93.key
         artifact-name: binutils-source.tar.zst
         strip-components: 1
         add-prefix: binutils-source/
 
-binutils-2.36.1:
-    description: binutils 2.36.1 source code
+binutils-2.31.1:
+    description: binutils 2.31.1 source code
     fetch:
         type: static-url
-        url: ftp://ftp.gnu.org/gnu/binutils/binutils-2.36.1.tar.xz
-        sha256: e81d9edf373f193af428a0f256674aea62a9d74dfe93f65192d4eae030b0f3b0
-        size: 22772248
+        url: ftp://ftp.gnu.org/gnu/binutils/binutils-2.31.1.tar.xz
+        sha256: 5d20086ecf5752cc7d9134246e9588fa201740d540f7eb84d795b1f7a93bca86
+        size: 20467996
         gpg-signature:
             sig-url: "{url}.sig"
             key-path: build/unix/build-binutils/3A24BC1E8FB409FA9F14371813FCEF89DD9E3C4F.key
         artifact-name: binutils-source.tar.zst
         strip-components: 1
         add-prefix: binutils-source/
 
 gcc-6.5.0:

--- a/taskcluster/ci/toolchain/misc.yml
+++ b/taskcluster/ci/toolchain/misc.yml
@@ -43,17 +43,17 @@ linux64-binutils:
         symbol: TL(binutil)
     run:
         script: build-binutils-linux.sh
         resources:
             - 'build/unix/build-binutils/build-binutils.sh'
         toolchain-artifact: public/build/binutils.tar.xz
     fetches:
         fetch:
-            - binutils-2.36.1
+            - binutils-2.31.1
         toolchain:
             # Work around https://bugs.debian.org/786883 by using toolchain
             # gcc. We can remove this workaround when we upgrade the toolchain
             # docker image to Debian bullseye.
             - linux64-gcc-7
             - linux64-toolchain-sysroot
 
 linux64-hfsplus: