diff --git a/.copier-answers.yml b/.copier-answers.yml
index 8b129e3..f80c135 100644
--- a/.copier-answers.yml
+++ b/.copier-answers.yml
@@ -1,5 +1,5 @@
 # Changes here will be overwritten by Copier
-_commit: v1.6.1
+_commit: v1.6.3
 _src_path: https://github.com/DeveloperC286/template
 project_name: conventional_commits_next_version
 uses_git: true
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 73b4fb6..178e4a7 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -6,6 +6,19 @@ permissions:
   contents: read
 
 jobs:
+  permissions:
+    name: Permissions
+    runs-on: ${{ matrix.architecture }}
+    strategy:
+      matrix:
+        architecture: [ubuntu-24.04, ubuntu-24.04-arm]
+        language: [shell]
+    steps:
+      - name: Checkout code.
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Check permissions.
+        run: make check-${{ matrix.language }}-permissions
+
   formatting:
     name: Formatting
     runs-on: ${{ matrix.architecture }}
@@ -27,7 +40,7 @@ jobs:
     strategy:
       matrix:
         architecture: [ubuntu-24.04, ubuntu-24.04-arm]
-        language: [rust, shell]
+        language: [rust, shell, python]
     steps:
       - name: Checkout code.
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
@@ -36,17 +49,20 @@ jobs:
       - name: Check linting.
         run: nix develop -c make check-${{ matrix.language }}-linting
 
-  scripts-permissions:
-    name: Scripts Permissions
+  dependencies:
+    name: Dependencies
     runs-on: ${{ matrix.architecture }}
     strategy:
       matrix:
         architecture: [ubuntu-24.04, ubuntu-24.04-arm]
+        language: [rust]
     steps:
       - name: Checkout code.
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-      - name: Check scripts permissions.
-        run: make check-scripts-permissions
+      - name: Setup Nix.
+        uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
+      - name: Check dependencies.
+        run: nix develop -c make check-${{ matrix.language }}-dependencies
 
   compile:
     name: Compile
diff --git a/.github/workflows/conventional-commits.yml b/.github/workflows/conventional-commits.yml
index 56eb9a6..9e43c89 100644
--- a/.github/workflows/conventional-commits.yml
+++ b/.github/workflows/conventional-commits.yml
@@ -10,7 +10,7 @@ jobs:
     name: Linting
     runs-on: ubuntu-24.04
     container:
-      image: ghcr.io/developerc286/conventional_commits_linter:0.17.0@sha256:d6fb0dfd79c2e06897692bc3f0dc62bcb7ce90a92030c81a3137935516d525d7
+      image: ghcr.io/developerc286/conventional_commits_linter:0.17.1@sha256:f1b947937ee884ba7f886d04939cd4858f9aeafb50dcf94925a516c50e43021b
     steps:
       - name: Checkout code.
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
diff --git a/.github/workflows/git-history.yml b/.github/workflows/git-history.yml
index 476fc11..1b18abe 100644
--- a/.github/workflows/git-history.yml
+++ b/.github/workflows/git-history.yml
@@ -10,7 +10,7 @@ jobs:
     name: Clean
     runs-on: ubuntu-24.04
     container:
-      image: ghcr.io/developerc286/clean_git_history:1.1.5@sha256:b1374591d48393f6b5fcc888f6bc7da05f7d218961f7850112130b1cad78186a
+      image: ghcr.io/developerc286/clean_git_history:1.1.6@sha256:93fd9c692f6e629956921b8d068ccad33760882b6e0c6d4d32cd963380aec25f
     steps:
       - name: Checkout code.
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
diff --git a/Cargo.toml b/Cargo.toml
index f07e54b..05879ad 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,3 +40,6 @@ anyhow = "1.0.89"
 [dev-dependencies]
 # For parameterized testing.
 rstest = "=0.26.1"
+
+[package.metadata.cargo-machete]
+ignored = ["strum"]
diff --git a/Makefile b/Makefile
index 9792a52..b2c0abb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,10 @@
 # Auto-detect musl target for static binaries (Linux only)
+# Only set MUSL_TARGET on supported architectures; targets that need it will check
 MUSL_TARGET := $(shell uname -m | sed 's/^x86_64$$/x86_64-unknown-linux-musl/;s/^aarch64$$/aarch64-unknown-linux-musl/')
-ifeq ($(filter %unknown-linux-musl,$(MUSL_TARGET)),)
-    $(error Unsupported architecture: $(shell uname -m). Static musl builds only supported on Linux x86_64 and aarch64)
-endif
+
+define check-musl-target
+$(if $(filter %unknown-linux-musl,$(MUSL_TARGET)),,$(error Unsupported architecture: $(shell uname -m). Static musl builds only supported on Linux x86_64 and aarch64))
+endef
 
 # Use --locked in CI to ensure reproducible builds
 CARGO_LOCKED := $(if $(CI),--locked,)
@@ -10,34 +12,38 @@ CARGO_LOCKED := $(if $(CI),--locked,)
 .PHONY: default
 default: compile
 
+.PHONY: check-shell-permissions
+check-shell-permissions:
+	./ci/check-scripts-permissions.sh
+
 .PHONY: check-rust-formatting
 check-rust-formatting:
 	cargo fmt --all -- --check --config=group_imports=StdExternalCrate
 
-.PHONY: check-shell-formatting
-check-shell-formatting:
-	shfmt --simplify --diff ci/*
-
-.PHONY: check-python-formatting
-check-python-formatting:
-	autopep8 --exit-code --diff --aggressive --aggressive --max-line-length 120 --recursive end-to-end-tests/
-
-.PHONY: check-yaml-formatting
-check-yaml-formatting:
-	yamlfmt -verbose -lint -dstar .github/workflows/*
-
 .PHONY: fix-rust-formatting
 fix-rust-formatting:
 	cargo fmt --all -- --config=group_imports=StdExternalCrate
 
+.PHONY: check-shell-formatting
+check-shell-formatting:
+	shfmt --simplify --diff ci/*
+
 .PHONY: fix-shell-formatting
 fix-shell-formatting:
 	shfmt --simplify --write ci/*
 
+.PHONY: check-python-formatting
+check-python-formatting:
+	autopep8 --exit-code --diff --aggressive --aggressive --max-line-length 120 --recursive end-to-end-tests/
+
 .PHONY: fix-python-formatting
 fix-python-formatting:
 	autopep8 --in-place --aggressive --aggressive --max-line-length 120 --recursive end-to-end-tests/
 
+.PHONY: check-yaml-formatting
+check-yaml-formatting:
+	yamlfmt -verbose -lint -dstar .github/workflows/*
+
 .PHONY: fix-yaml-formatting
 fix-yaml-formatting:
 	yamlfmt -verbose -dstar .github/workflows/*
@@ -50,13 +56,21 @@ check-rust-linting:
 check-shell-linting:
 	shellcheck ci/*.sh
 
+.PHONY: check-python-linting
+check-python-linting:
+	ruff check --line-length 120 end-to-end-tests/
+
+.PHONY: fix-python-linting
+fix-python-linting:
+	ruff check --fix --line-length 120 end-to-end-tests/
+
 .PHONY: check-github-actions-workflows-linting
 check-github-actions-workflows-linting:
 	actionlint -verbose -color
 
-.PHONY: check-scripts-permissions
-check-scripts-permissions:
-	./ci/check-scripts-permissions.sh
+.PHONY: check-rust-dependencies
+check-rust-dependencies:
+	cargo machete
 
 .PHONY: compile
 compile:
@@ -72,6 +86,7 @@ end-to-end-test: compile
 
 .PHONY: release
 release:
+	$(call check-musl-target)
 	cargo build --release --target=$(MUSL_TARGET) --locked --verbose
 
 .PHONY: publish-binary
diff --git a/end-to-end-tests/features/steps/assertions.py b/end-to-end-tests/features/steps/assertions.py
index 344600a..baf7e6c 100644
--- a/end-to-end-tests/features/steps/assertions.py
+++ b/end-to-end-tests/features/steps/assertions.py
@@ -31,7 +31,7 @@ def assert_error_contains(result, error):
 
 
 def assert_error_matches_regex(result, regex):
-    assert regex.match(result.stderr) is not None, f"Expected standard error to match the regex.\n" + \
+    assert regex.match(result.stderr) is not None, "Expected standard error to match the regex.\n" + \
         f"Standard error = {result.stderr.encode()}.\n" + \
         f"Regex          = {regex.pattern.encode()}.\n"
 
@@ -43,6 +43,6 @@ def assert_error_is_one_of(result, errors):
 
 
 def assert_next_version(result, expected_next_version):
-    assert result.stdout == expected_next_version, f"The next version was not what was expected.\n" + \
+    assert result.stdout == expected_next_version, "The next version was not what was expected.\n" + \
         f"Expected = {expected_next_version}.\n" + \
         f"Actual   = {result.stdout}\n"
diff --git a/end-to-end-tests/features/steps/then.py b/end-to-end-tests/features/steps/then.py
index 6b225ce..7e09c89 100644
--- a/end-to-end-tests/features/steps/then.py
+++ b/end-to-end-tests/features/steps/then.py
@@ -2,7 +2,16 @@
 from behave import then
 
 from utilities import execute_conventional_commits_next_version
-from assertions import *
+from assertions import (
+    assert_command_successful,
+    assert_command_unsuccessful,
+    assert_error_contains,
+    assert_error_equals,
+    assert_error_matches_regex,
+    assert_next_version,
+    assert_no_errors,
+    assert_no_output,
+)
 
 
 @then('the returned version should be "{expected_next_version}".')
diff --git a/flake.nix b/flake.nix
index 9fcad95..5140649 100644
--- a/flake.nix
+++ b/flake.nix
@@ -40,15 +40,22 @@
           buildInputs = [
             # Rust with cross-compilation targets built-in.
             rustWithTargets
-            # Shell scripts.
+            # Shell formatting.
             pkgs.shfmt
-            pkgs.shellcheck
-            # GitHub Action Workflows.
+            # Python formatting.
+            pkgs.python313Packages.autopep8
+            # YAML formatting.
             pkgs.yamlfmt
+            # Shell linting.
+            pkgs.shellcheck
+            # Python linting.
+            pkgs.ruff
+            # GitHub Actions workflows linting.
             pkgs.actionlint
+            # Rust dependencies check.
+            pkgs.cargo-machete
             # End to end tests.
             pkgs.python313
-            pkgs.python313Packages.autopep8
             pkgs.python313Packages.behave
             pkgs.git
             # Deploying.