diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a38761d166567..c1a2505883106 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ name: CI
       - "**"
 defaults:
   run:
-    shell: "python src/ci/exec-with-shell.py {0}"
+    shell: bash
 jobs:
   pr:
     name: PR
@@ -54,7 +54,6 @@ jobs:
     steps:
       - name: disable git crlf conversion
         run: git config --global core.autocrlf false
-        shell: bash
       - name: checkout the source code
         uses: actions/checkout@v1
         with:
@@ -154,7 +153,6 @@ jobs:
     steps:
       - name: disable git crlf conversion
         run: git config --global core.autocrlf false
-        shell: bash
       - name: checkout the source code
         uses: actions/checkout@v1
         with:
@@ -466,7 +464,6 @@ jobs:
     steps:
       - name: disable git crlf conversion
         run: git config --global core.autocrlf false
-        shell: bash
       - name: checkout the source code
         uses: actions/checkout@v1
         with:
@@ -592,7 +589,6 @@ jobs:
     steps:
       - name: disable git crlf conversion
         run: git config --global core.autocrlf false
-        shell: bash
       - name: checkout the source code
         uses: actions/checkout@v1
         with:
@@ -688,6 +684,7 @@ jobs:
           fetch-depth: 2
       - name: publish toolstate
         run: src/ci/publish_toolstate.sh
+        shell: bash
         env:
           TOOLSTATE_REPO_ACCESS_TOKEN: "${{ secrets.TOOLSTATE_REPO_ACCESS_TOKEN }}"
         if: success() && !env.SKIP_JOB
diff --git a/src/ci/exec-with-shell.py b/src/ci/exec-with-shell.py
deleted file mode 100755
index 26ce69e33d9c3..0000000000000
--- a/src/ci/exec-with-shell.py
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/usr/bin/env python
-# A simple wrapper that forwards the arguments to bash, unless the
-# CI_OVERRIDE_SHELL environment variable is present: in that case the content
-# of that environment variable is used as the shell path.
-
-import os
-import sys
-import subprocess
-
-try:
-    shell = os.environ["CI_OVERRIDE_SHELL"]
-except KeyError:
-    shell = "bash"
-
-res = subprocess.call([shell] + sys.argv[1:])
-sys.exit(res)
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 502949d5e4c13..978a0c56eb672 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -79,7 +79,6 @@ x--expand-yaml-anchors--remove:
     steps:
       - name: disable git crlf conversion
         run: git config --global core.autocrlf false
-        shell: bash
 
       - name: checkout the source code
         uses: actions/checkout@v1
@@ -231,18 +230,10 @@ on:
 
 defaults:
   run:
-    # While on Linux and macOS builders it just forwards the arguments to the
-    # system bash, this wrapper allows switching from the host's bash.exe to
-    # the one we install along with MSYS2 mid-build on Windows.
-    #
-    # Once the step to install MSYS2 is executed, the CI_OVERRIDE_SHELL
-    # environment variable is set pointing to our MSYS2's bash.exe. From that
-    # moment the host's bash.exe will not be called anymore.
-    #
-    # This is needed because we can't launch our own bash.exe from the host
-    # bash.exe, as that would load two different cygwin1.dll in memory, causing
-    # "cygwin heap mismatch" errors.
-    shell: python src/ci/exec-with-shell.py {0}
+    # On Linux, macOS, and Windows, use the system-provided bash as the default
+    # shell. (This should only make a difference on Windows, where the default
+    # shell is PowerShell.)
+    shell: bash
 
 jobs:
   pr:
@@ -614,6 +605,7 @@ jobs:
 
       - name: publish toolstate
         run: src/ci/publish_toolstate.sh
+        shell: bash
         env:
           TOOLSTATE_REPO_ACCESS_TOKEN: ${{ secrets.TOOLSTATE_REPO_ACCESS_TOKEN }}
         <<: *step
diff --git a/src/ci/scripts/install-msys2.sh b/src/ci/scripts/install-msys2.sh
index 3a0c965a67710..185d361582505 100755
--- a/src/ci/scripts/install-msys2.sh
+++ b/src/ci/scripts/install-msys2.sh
@@ -12,9 +12,6 @@ if isWindows; then
     mkdir -p "${msys2Path}/home/${USERNAME}"
     ciCommandAddPath "${msys2Path}/usr/bin"
 
-    echo "switching shell to use our own bash"
-    ciCommandSetEnv CI_OVERRIDE_SHELL "${msys2Path}/usr/bin/bash.exe"
-
     # Detect the native Python version installed on the agent. On GitHub
     # Actions, the C:\hostedtoolcache\windows\Python directory contains a
     # subdirectory for each installed Python version.
diff --git a/src/tools/cargo b/src/tools/cargo
index 4f74d9b2a771c..149022b1d8f38 160000
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 4f74d9b2a771c58b7ef4906b2668afd075bc8081
+Subproject commit 149022b1d8f382e69c1616f6a46b69ebf59e2dea