diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 336b86c8db52..6bd929c5174c 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -19,7 +19,7 @@ jobs:
         name: Install Python
         with:
           python-version: '3.10'
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.73
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.13.0
       - uses: actions/upload-artifact@v3
@@ -40,7 +40,7 @@ jobs:
         name: Install Python
         with:
           python-version: '3.10'
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.73
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.13.0
         env:
@@ -85,7 +85,7 @@ jobs:
         name: Install Python
         with:
           python-version: '3.10'
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.73
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
         with:
@@ -118,7 +118,7 @@ jobs:
         name: Install Python
         with:
           python-version: '3.10'
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.73
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
         with:
@@ -151,7 +151,7 @@ jobs:
         name: Install Python
         with:
           python-version: '3.10'
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.73
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
         with:
diff --git a/pyproject.toml b/pyproject.toml
index 25ff0a5dade7..d518b49649df 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,11 +17,11 @@ test-command = "python {project}/examples/python/stochastic_swap.py"
 # Numpy 1.22 there are no i686 wheels, so we force pip to use older ones without
 # restricting any dependencies that Numpy and Scipy might have.
 before-test = "pip install --only-binary=numpy,scipy numpy scipy"
-environment = 'RUSTUP_TOOLCHAIN="stable"'
+environment = 'RUSTUP_TOOLCHAIN="1.73"'
 
 [tool.cibuildwheel.linux]
 before-all = "yum install -y wget && {package}/tools/install_rust.sh"
-environment = 'PATH="$PATH:$HOME/.cargo/bin" CARGO_NET_GIT_FETCH_WITH_CLI="true" RUSTUP_TOOLCHAIN="stable"'
+environment = 'PATH="$PATH:$HOME/.cargo/bin" CARGO_NET_GIT_FETCH_WITH_CLI="true" RUSTUP_TOOLCHAIN="1.73"'
 repair-wheel-command = "auditwheel repair -w {dest_dir} {wheel} && pipx run abi3audit --strict --report {wheel}"
 
 [tool.cibuildwheel.macos]
diff --git a/tools/install_rust.sh b/tools/install_rust.sh
index d86416207240..8b943a287986 100755
--- a/tools/install_rust.sh
+++ b/tools/install_rust.sh
@@ -2,5 +2,5 @@
 if [ ! -d rust-installer ]; then
     mkdir rust-installer
     wget https://sh.rustup.rs -O rust-installer/rustup.sh
-    sh rust-installer/rustup.sh -y
+    sh rust-installer/rustup.sh -y --default-toolchain 1.73
 fi