diff --git a/Makefile b/Makefile
index b15183a1..468cd9a1 100644
--- a/Makefile
+++ b/Makefile
@@ -54,68 +54,10 @@ tox:
 
 
 lint-rust:
-	cargo fmt --version
 	cargo fmt --all -- --check
-	cargo clippy --version
-	cargo clippy --tests -- \
-		-D warnings \
-		-W clippy::pedantic \
-		-W clippy::dbg_macro \
-		-W clippy::print_stdout \
-		-A clippy::cast-possible-truncation \
-		-A clippy::cast-possible-wrap \
-		-A clippy::cast-precision-loss \
-		-A clippy::cast-sign-loss \
-		-A clippy::doc-markdown \
-		-A clippy::float-cmp \
-		-A clippy::fn-params-excessive-bools \
-		-A clippy::if-not-else \
-		-A clippy::manual-let-else \
-		-A clippy::match-bool \
-		-A clippy::match-same-arms \
-		-A clippy::missing-errors-doc \
-		-A clippy::missing-panics-doc \
-		-A clippy::module-name-repetitions \
-		-A clippy::must-use-candidate \
-		-A clippy::needless-pass-by-value \
-		-A clippy::similar-names \
-		-A clippy::single-match-else \
-		-A clippy::struct-excessive-bools \
-		-A clippy::too-many-lines \
-		-A clippy::unnecessary-wraps \
-		-A clippy::unused-self \
-		-A clippy::used-underscore-binding
+	cargo clippy --tests -- -D warnings
 
 
 format-rust:
-	cargo fmt --version
 	cargo fmt --all
-	cargo clippy --version
-	cargo clippy --tests --fix --allow-dirty -- \
-		-D warnings \
-		-W clippy::pedantic \
-		-W clippy::dbg_macro \
-		-W clippy::print_stdout \
-		-A clippy::cast-possible-truncation \
-		-A clippy::cast-possible-wrap \
-		-A clippy::cast-precision-loss \
-		-A clippy::cast-sign-loss \
-		-A clippy::doc-markdown \
-		-A clippy::float-cmp \
-		-A clippy::fn-params-excessive-bools \
-		-A clippy::if-not-else \
-		-A clippy::manual-let-else \
-		-A clippy::match-bool \
-		-A clippy::match-same-arms \
-		-A clippy::missing-errors-doc \
-		-A clippy::missing-panics-doc \
-		-A clippy::module-name-repetitions \
-		-A clippy::must-use-candidate \
-		-A clippy::needless-pass-by-value \
-		-A clippy::similar-names \
-		-A clippy::single-match-else \
-		-A clippy::struct-excessive-bools \
-		-A clippy::too-many-lines \
-		-A clippy::unnecessary-wraps \
-		-A clippy::unused-self \
-		-A clippy::used-underscore-binding
+	cargo clippy --tests --fix --allow-dirty -- -D warnings
diff --git a/_pendulum.pyi b/_pendulum.pyi
index 02520a14..74d7d830 100644
--- a/_pendulum.pyi
+++ b/_pendulum.pyi
@@ -37,5 +37,4 @@ def local_time(
     unix_time: int, utc_offset: int, microseconds: int
 ) -> tuple[int, int, int, int, int, int, int]: ...
 def precise_diff(d1: datetime | date, d2: datetime | date) -> PreciseDiff: ...
-def timestamp(dt: datetime) -> int: ...
 def week_day(year: int, month: int, day: int) -> int: ...
diff --git a/build.py b/build.py
index 4ff12214..60d3c4ba 100644
--- a/build.py
+++ b/build.py
@@ -25,6 +25,9 @@ def _build():
 
     maturin("build", "-r", *cargo_args)
 
+    # We won't use the wheel built by maturin directly since
+    # we want Poetry to build it but we need to retrieve the
+    # compiled extensions from the maturin wheel.
     wheel = list(wheels_dir.glob("*.whl"))[0]
     with zipfile.ZipFile(wheel.as_posix()) as whl:
         whl.extractall(wheels_dir.as_posix())
diff --git a/pendulum/_helpers.py b/pendulum/_helpers.py
index 4dd4c726..1b586d31 100644
--- a/pendulum/_helpers.py
+++ b/pendulum/_helpers.py
@@ -84,28 +84,6 @@ def days_in_year(year: int) -> int:
     return DAYS_PER_N_YEAR
 
 
-def timestamp(dt: datetime.datetime) -> int:
-    year = dt.year
-
-    result = (year - 1970) * 365 + MONTHS_OFFSETS[0][dt.month]
-    result += (year - 1968) // 4
-    result -= (year - 1900) // 100
-    result += (year - 1600) // 400
-
-    if is_leap(year) and dt.month < 3:
-        result -= 1
-
-    result += dt.day - 1
-    result *= 24
-    result += dt.hour
-    result *= 60
-    result += dt.minute
-    result *= 60
-    result += dt.second
-
-    return result
-
-
 def local_time(
     unix_time: int, utc_offset: int, microseconds: int
 ) -> tuple[int, int, int, int, int, int, int]:
diff --git a/pendulum/parser.py b/pendulum/parser.py
index 66e33ea1..2cb5ef95 100644
--- a/pendulum/parser.py
+++ b/pendulum/parser.py
@@ -18,9 +18,9 @@
     from pendulum.time import Time
 
 try:
-    from _pendulum import Duration as CDuration
+    from _pendulum import Duration as RustDuration
 except ImportError:
-    CDuration = None  # type: ignore[assignment,misc]
+    RustDuration = None  # type: ignore[assignment,misc]
 
 
 def parse(text: str, **options: t.Any) -> Date | Time | DateTime | Duration:
@@ -113,7 +113,7 @@ def _parse(text: str, **options: t.Any) -> Date | DateTime | Time | Duration | I
     if isinstance(parsed, Duration):
         return parsed
 
-    if CDuration and isinstance(parsed, CDuration):  # type: ignore[truthy-function]
+    if RustDuration is not None and isinstance(parsed, RustDuration):
         return pendulum.duration(
             years=parsed.years,
             months=parsed.months,
diff --git a/pyproject.toml b/pyproject.toml
index e0382f98..5fd519a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,9 +17,6 @@ packages = [
 include = [
     { path = "meson.build", format = "sdist" },
     { path = "pendulum/py.typed" },
-    # C extensions must be included in the wheel distributions
-    { path = "pendulum/_extensions/*.so", format = "wheel" },
-    { path = "pendulum/_extensions/*.pyd", format = "wheel" },
     # Typing stubs
     { path = "*.pyi"},
     # Rust source
@@ -224,5 +221,5 @@ omit = [
 ]
 
 [build-system]
-requires = ["poetry-core>=1.1.0a6", "maturin>=1,<2"]
+requires = ["poetry-core>=1.6.1", "maturin>=1,<2"]
 build-backend = "poetry.core.masonry.api"