diff --git a/.github/workflows/dependencies.yaml b/.github/workflows/dependencies.yaml
index 25e2d23..9ca752b 100644
--- a/.github/workflows/dependencies.yaml
+++ b/.github/workflows/dependencies.yaml
@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/rust-toolchain
         with:
-          toolchain: 1.74
+          toolchain: 1.77
       - run: cargo install --locked cargo-audit
       - run: cargo audit
 
diff --git a/.github/workflows/ffi.yaml b/.github/workflows/ffi.yaml
index cb10907..cb40656 100644
--- a/.github/workflows/ffi.yaml
+++ b/.github/workflows/ffi.yaml
@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/rust-toolchain
         with:
-          toolchain: 1.74
+          toolchain: 1.77
       - run: cargo install cbindgen@^0.24
       - run: |
           cbindgen --config ffi/cbindgen.toml \
@@ -33,7 +33,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/rust-toolchain
         with:
-          toolchain: 1.74
+          toolchain: 1.77
       - run: sudo apt-get install -y cmake nlohmann-json3-dev
       - run: |
           cmake -S ffi/integration/ \
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index 1015f57..43f39bf 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/rust-toolchain
         with:
-          toolchain: 1.74
+          toolchain: 1.77
       - run: cargo check
       # The foundation-ffi crate won't compile for x86_64 targets because it
       # requires a nightly Rust compiler for defining a global allocator and
@@ -36,7 +36,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/rust-toolchain
         with:
-          toolchain: 1.74
+          toolchain: 1.77
           components: rustfmt
       - run: cargo fmt --all -- --check
 
@@ -48,7 +48,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/rust-toolchain
         with:
-          toolchain: 1.74
+          toolchain: 1.77
           components: clippy
       - run: cargo clippy
 
@@ -60,7 +60,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/rust-toolchain
         with:
-          toolchain: 1.74
+          toolchain: 1.77
       - run: cargo test
       - run: cargo test --no-default-features --workspace --exclude foundation-ffi
       - run: cargo test --all-features
diff --git a/README.md b/README.md
index 4f9d975..4338bea 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
 
 ## Minimum Supported Rust Version (MSRV).
 
-The minimum supported version Rust version is `1.74`.
+The minimum supported version Rust version is `1.77`.
 
 ## Licensing
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 8e1fca5..12f2d4b 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -2,7 +2,11 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 # Keep this in sync. with the CI.
+#
+# Preferably should be the same version as GNU Guix to make packaging easier:
+#
+# <https://packages.guix.gnu.org/packages/rust/>
 [toolchain]
-channel = "1.74"
+channel = "1.77"
 profile = "default"
 targets = ["thumbv7em-none-eabihf"]