diff --git a/.github/workflows.src/build.inc.yml b/.github/workflows.src/build.inc.yml
index 7a65009379a..08adf4b5a2c 100644
--- a/.github/workflows.src/build.inc.yml
+++ b/.github/workflows.src/build.inc.yml
@@ -131,8 +131,18 @@
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: << 'false' if tgt.runs_on and 'self-hosted' in tgt.runs_on else 'true' >>
       with:
         components: "cargo,rustc,rust-std"
diff --git a/.github/workflows/dryrun.yml b/.github/workflows/dryrun.yml
index 4fc67adadf3..150271abd78 100644
--- a/.github/workflows/dryrun.yml
+++ b/.github/workflows/dryrun.yml
@@ -901,8 +901,18 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: true
       with:
         components: "cargo,rustc,rust-std"
@@ -959,8 +969,18 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: true
       with:
         components: "cargo,rustc,rust-std"
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index af26c38fb72..40a22e13b3d 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -906,8 +906,18 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: true
       with:
         components: "cargo,rustc,rust-std"
@@ -964,8 +974,18 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: true
       with:
         components: "cargo,rustc,rust-std"
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 07e0b0bc728..43622704d86 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -502,8 +502,18 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: true
       with:
         components: "cargo,rustc,rust-std"
@@ -558,8 +568,18 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: true
       with:
         components: "cargo,rustc,rust-std"
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 2c8e0219638..110902a434c 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -523,8 +523,18 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: true
       with:
         components: "cargo,rustc,rust-std"
@@ -580,8 +590,18 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - name: Update Homebrew before installing Rust toolchain
+      run: |
+        # Homebrew renamed `rustup-init` to `rustup`:
+        #   https://github.com/Homebrew/homebrew-core/pull/177840
+        # But the GitHub Action runner is not updated with this change yet.
+        # This caused the later `brew update` in step `Build` to relink Rust
+        # toolchain executables, overwriting the custom toolchain installed by
+        # `dtolnay/rust-toolchain`. So let's just run `brew update` early.
+        brew update
+
     - name: Install Rust toolchain
-      uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+      uses: dtolnay/rust-toolchain@d0e72ca3bfdc51937a4f81431ccbed269ef9f2a2
       if: true
       with:
         components: "cargo,rustc,rust-std"