diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index ef5b390b..e9363e64 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -9,6 +9,7 @@ env:
   CARGO_TERM_COLOR: always
   NDK_VERSION: 25.2.9519653
   RUST_BACKTRACE: 1
+  LIBSIGNAL_MINIMUM_SUPPORTED_RUST_VERSION: 1.72
 
 jobs:
   changes:
@@ -98,16 +99,17 @@ jobs:
       matrix:
         version: [nightly, stable]
         include:
-          - version: stable
-            toolchain: "+stable"
+        - version: nightly
+          toolchain: "$(cat rust-toolchain)"
+        - version: stable
+          toolchain: "${LIBSIGNAL_MINIMUM_SUPPORTED_RUST_VERSION}"
 
     steps:
     - uses: actions/checkout@v3
 
     - run: sudo apt-get update && sudo apt-get install protobuf-compiler
 
-    - run: rustup toolchain install $(cat rust-toolchain) --profile minimal --component rustfmt,clippy
-      if: matrix.version == 'nightly'
+    - run: rustup toolchain install ${{ matrix.toolchain }} --profile minimal --component rustfmt,clippy
 
     - name: Cache locally-built tools
       uses: actions/cache@v3
@@ -143,16 +145,16 @@ jobs:
       if: matrix.version == 'nightly'
 
     - name: Build
-      run: cargo ${{ matrix.toolchain }} build --workspace --features libsignal-ffi/signal-media --verbose
+      run: cargo +${{ matrix.toolchain }} build --workspace --features libsignal-ffi/signal-media --verbose
 
     - name: Run tests
-      run: cargo ${{ matrix.toolchain }} test --workspace --all-features --verbose -- --include-ignored
+      run: cargo +${{ matrix.toolchain }} test --workspace --all-features --verbose -- --include-ignored
 
     - name: Test run benches
-      run: cargo ${{ matrix.toolchain }} test --workspace --benches --all-features --verbose
+      run: cargo +${{ matrix.toolchain }} test --workspace --benches --all-features --verbose
 
     - name: Build bins and examples
-      run: cargo ${{ matrix.toolchain }} build --workspace  --bins --examples --all-features --verbose
+      run: cargo +${{ matrix.toolchain }} build --workspace  --bins --examples --all-features --verbose
 
     - name: Clippy
       run: cargo clippy --workspace --all-targets --all-features -- -D warnings
@@ -168,14 +170,14 @@ jobs:
     # See https://github.com/dtolnay/proc-macro2/issues/307 for an example.
 
     - name: Check that the protocol fuzz target still builds
-      run: cargo +stable check --all-targets
+      run: cargo +${{ matrix.toolchain }} check --all-targets
       working-directory: rust/protocol/fuzz
       env:
         RUSTFLAGS: --cfg fuzzing
       if: matrix.version == 'stable'
 
     - name: Check that the attest fuzz target still builds
-      run: cargo +stable check --all-targets
+      run: cargo +${{ matrix.toolchain }} check --all-targets
       working-directory: rust/attest/fuzz
       env:
         RUSTFLAGS: --cfg fuzzing
@@ -195,24 +197,21 @@ jobs:
       matrix:
         version: [nightly, stable]
         include:
-          - version: stable
-            toolchain: "+stable"
+        - version: nightly
+          toolchain: "$(cat rust-toolchain)"
+        - version: stable
+          toolchain: "${LIBSIGNAL_MINIMUM_SUPPORTED_RUST_VERSION}"
 
     steps:
     - uses: actions/checkout@v3
 
     - run: sudo apt-get update && sudo apt-get install gcc-multilib g++-multilib protobuf-compiler
 
-    - run: rustup toolchain install $(cat rust-toolchain) --profile minimal --target i686-unknown-linux-gnu
-      if: matrix.version == 'nightly'
-
-    - name: Install Rust (stable)
-      run: rustup +stable target add i686-unknown-linux-gnu
-      if: matrix.version == 'stable'
+    - run: rustup toolchain install ${{ matrix.toolchain }} --profile minimal --target i686-unknown-linux-gnu
 
     - name: Run tests (32-bit)
       # Exclude signal-neon-futures because those tests run Node
-      run: cargo ${{ matrix.toolchain }} test --workspace --all-features --verbose --target i686-unknown-linux-gnu --exclude signal-neon-futures -- --include-ignored
+      run: cargo +${{ matrix.toolchain }} test --workspace --all-features --verbose --target i686-unknown-linux-gnu --exclude signal-neon-futures -- --include-ignored
 
   java:
     name: Java
diff --git a/.github/workflows/slow_tests.yml b/.github/workflows/slow_tests.yml
index 9965b098..12b77601 100644
--- a/.github/workflows/slow_tests.yml
+++ b/.github/workflows/slow_tests.yml
@@ -178,8 +178,8 @@ jobs:
         # No import validation because it tries to build unsupported platforms (like 32-bit iOS).
         run: pod lib lint --verbose --platforms=ios --include-podspecs=SignalCoreKit/SignalCoreKit.podspec --skip-import-validation
 
-  rust-protocol-cross-version-testing:
-    name: libsignal-protocol Cross-version Tests
+  rust-stable-testing:
+    name: Rust tests (using latest stable)
     runs-on: ubuntu-latest
     needs: [check-up-to-date]
     if: ${{ always() && (needs.check-up-to-date.outputs.has-changes || github.event_name != 'schedule') }}
@@ -192,10 +192,23 @@ jobs:
     - run: rustup +stable target add i686-unknown-linux-gnu
 
     - name: Run tests
+      run: cargo +stable test --workspace --all-features --verbose -- --include-ignored
+
+    - name: Test run benches
+      run: cargo +stable test --workspace --benches --all-features --verbose
+
+    - name: Build bins and examples
+      run: cargo +stable build --workspace  --bins --examples --all-features --verbose
+
+    - name: Run tests (32-bit)
+      # Exclude signal-neon-futures because those tests run Node
+      run: cargo +stable test --workspace --all-features --verbose --target i686-unknown-linux-gnu --exclude signal-neon-futures -- --include-ignored
+
+    - name: Run libsignal-protocol cross-version tests
       run: cargo +stable test
       working-directory: rust/protocol/cross-version-testing
 
-    - name: Run tests (32-bit)
+    - name: Run libsignal-protocol cross-version tests (32-bit)
       run: cargo +stable test --target i686-unknown-linux-gnu
       working-directory: rust/protocol/cross-version-testing
 
@@ -205,7 +218,7 @@ jobs:
   report_failures:
     name: Report Failures
     runs-on: ubuntu-latest
-    needs: [java-docker, android-emulator-tests, node-docker, node-windows-arm64, swift-cocoapod, rust-protocol-cross-version-testing]
+    needs: [java-docker, android-emulator-tests, node-docker, node-windows-arm64, swift-cocoapod, rust-stable-testing]
     if: ${{ failure() && github.event_name == 'schedule' }}
 
     permissions: