diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e9e2ad2a..77f4f688 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -15,14 +15,14 @@ repos:
     # This brings in a portable version of clang-format.
     # See also: https://github.com/ssciwr/clang-format-wheel
   - repo: https://github.com/pre-commit/mirrors-clang-format
-    rev: v22.1.8
+    rev: v23.1.1
     hooks:
     - id: clang-format
       types_or: [c++, c]
 
     # CMake linting and formatting
   - repo: https://github.com/BlankSpruce/gersemi-pre-commit
-    rev: 0.28.0
+    rev: 0.28.1
     hooks:
     - id: gersemi
       name: CMake linting
diff --git a/include/beman/optional/optional.hpp b/include/beman/optional/optional.hpp
index 1fb6fb37..c24d698a 100644
--- a/include/beman/optional/optional.hpp
+++ b/include/beman/optional/optional.hpp
@@ -401,7 +401,7 @@ class optional {
      */
     template <class U>
     constexpr explicit(!std::is_convertible_v<U, T>) optional(optional<U>&& rhs)
-        requires (detail::enable_from_other<T, U, U &&>);
+        requires (detail::enable_from_other<T, U, U&&>);
 
     // \ref{optional.dtor}, destructor
     /**
@@ -871,7 +871,7 @@ inline constexpr optional<T>::optional(const optional<U>& rhs)
 template <class T>
 template <class U>
 inline constexpr optional<T>::optional(optional<U>&& rhs)
-    requires (detail::enable_from_other<T, U, U &&>)
+    requires (detail::enable_from_other<T, U, U&&>)
 {
     if (rhs.has_value()) {
         construct(*std::move(rhs));