diff --git a/pyproject.toml b/pyproject.toml
index f6b032aaee1..cfae651fb52 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -107,6 +107,8 @@ line-length = 95
 exclude = ["docs", "build", "src/metpy/io/_metar_parser/metar_parser.py"]
 select = ["A", "B", "C", "D", "E", "E226", "F", "G", "I", "N", "Q", "R", "S", "T", "U", "W"]
 ignore = ["F405", "I001", "RET504", "RET505", "RET506", "RET507", "RUF100"]
+preview = true
+explicit-preview-rules = true
 
 [tool.ruff.per-file-ignores]
 "ci/filter_links.py" = ["E731", "T201", "S603", "S607"]
diff --git a/src/metpy/calc/thermo.py b/src/metpy/calc/thermo.py
index dc9ce569a75..ec3f67ccb95 100644
--- a/src/metpy/calc/thermo.py
+++ b/src/metpy/calc/thermo.py
@@ -63,7 +63,7 @@ def relative_humidity_from_dewpoint(temperature, dewpoint):
     """
     e = saturation_vapor_pressure(dewpoint)
     e_s = saturation_vapor_pressure(temperature)
-    return (e / e_s)
+    return e / e_s
 
 
 @exporter.export