diff --git a/inst/include/cpp11.hpp b/inst/include/cpp11.hpp
index 00b8d163b..0e89feacc 100644
--- a/inst/include/cpp11.hpp
+++ b/inst/include/cpp11.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include "cpp11/R.hpp"
diff --git a/inst/include/cpp11/R.hpp b/inst/include/cpp11/R.hpp
index 982b42e63..e721c750f 100644
--- a/inst/include/cpp11/R.hpp
+++ b/inst/include/cpp11/R.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #ifdef R_INTERNALS_H_
@@ -51,7 +51,7 @@
 namespace cpp11 {
 namespace literals {
 
-constexpr R_xlen_t operator"" _xl(unsigned long long int value) { return value; }
+constexpr R_xlen_t operator""_xl(unsigned long long int value) { return value; }
 
 }  // namespace literals
 
diff --git a/inst/include/cpp11/altrep.hpp b/inst/include/cpp11/altrep.hpp
index 0d16e7be6..d0edaa2eb 100644
--- a/inst/include/cpp11/altrep.hpp
+++ b/inst/include/cpp11/altrep.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 // It would be nice to remove this since all supported versions of R have ALTREP, but
diff --git a/inst/include/cpp11/as.hpp b/inst/include/cpp11/as.hpp
index 9152e5864..75cc7a8c8 100644
--- a/inst/include/cpp11/as.hpp
+++ b/inst/include/cpp11/as.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <cmath>             // for modf
diff --git a/inst/include/cpp11/attribute_proxy.hpp b/inst/include/cpp11/attribute_proxy.hpp
index 276ee8d33..7cceabb09 100644
--- a/inst/include/cpp11/attribute_proxy.hpp
+++ b/inst/include/cpp11/attribute_proxy.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <initializer_list>  // for initializer_list
diff --git a/inst/include/cpp11/data_frame.hpp b/inst/include/cpp11/data_frame.hpp
index 73143a2ca..4459db8aa 100644
--- a/inst/include/cpp11/data_frame.hpp
+++ b/inst/include/cpp11/data_frame.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <cstdlib>  // for abs
diff --git a/inst/include/cpp11/declarations.hpp b/inst/include/cpp11/declarations.hpp
index 7aa879f19..107e89b0f 100644
--- a/inst/include/cpp11/declarations.hpp
+++ b/inst/include/cpp11/declarations.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <cstring>
diff --git a/inst/include/cpp11/doubles.hpp b/inst/include/cpp11/doubles.hpp
index f8b2f64fa..20e680b54 100644
--- a/inst/include/cpp11/doubles.hpp
+++ b/inst/include/cpp11/doubles.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <algorithm>         // for min, tranform
diff --git a/inst/include/cpp11/environment.hpp b/inst/include/cpp11/environment.hpp
index 23f54f9ce..c7f41c135 100644
--- a/inst/include/cpp11/environment.hpp
+++ b/inst/include/cpp11/environment.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <string>  // for string, basic_string
diff --git a/inst/include/cpp11/external_pointer.hpp b/inst/include/cpp11/external_pointer.hpp
index e441bc0f8..e4ecf1d4c 100644
--- a/inst/include/cpp11/external_pointer.hpp
+++ b/inst/include/cpp11/external_pointer.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <cstddef>      // for nullptr_t, NULL
diff --git a/inst/include/cpp11/function.hpp b/inst/include/cpp11/function.hpp
index 23a646cba..da9800e46 100644
--- a/inst/include/cpp11/function.hpp
+++ b/inst/include/cpp11/function.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <string.h>  // for strcmp
diff --git a/inst/include/cpp11/integers.hpp b/inst/include/cpp11/integers.hpp
index ca4261be6..02cf2bb88 100644
--- a/inst/include/cpp11/integers.hpp
+++ b/inst/include/cpp11/integers.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <algorithm>         // for min
diff --git a/inst/include/cpp11/list.hpp b/inst/include/cpp11/list.hpp
index 9df36cf7e..e4a3bb8eb 100644
--- a/inst/include/cpp11/list.hpp
+++ b/inst/include/cpp11/list.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <initializer_list>  // for initializer_list
diff --git a/inst/include/cpp11/list_of.hpp b/inst/include/cpp11/list_of.hpp
index 979a338df..0572c55fe 100644
--- a/inst/include/cpp11/list_of.hpp
+++ b/inst/include/cpp11/list_of.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <string>  // for string, basic_string
diff --git a/inst/include/cpp11/logicals.hpp b/inst/include/cpp11/logicals.hpp
index e834482b5..3700469c3 100644
--- a/inst/include/cpp11/logicals.hpp
+++ b/inst/include/cpp11/logicals.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <algorithm>         // for min
diff --git a/inst/include/cpp11/matrix.hpp b/inst/include/cpp11/matrix.hpp
index 0d53143ef..b350c2df7 100644
--- a/inst/include/cpp11/matrix.hpp
+++ b/inst/include/cpp11/matrix.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <iterator>
diff --git a/inst/include/cpp11/named_arg.hpp b/inst/include/cpp11/named_arg.hpp
index 2614e6959..5fcb79aae 100644
--- a/inst/include/cpp11/named_arg.hpp
+++ b/inst/include/cpp11/named_arg.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <stddef.h>  // for size_t
@@ -41,7 +41,7 @@ class named_arg {
 
 namespace literals {
 
-inline named_arg operator"" _nm(const char* name, std::size_t) { return named_arg(name); }
+inline named_arg operator""_nm(const char* name, std::size_t) { return named_arg(name); }
 
 }  // namespace literals
 
diff --git a/inst/include/cpp11/protect.hpp b/inst/include/cpp11/protect.hpp
index b30d95c45..8b161f24f 100644
--- a/inst/include/cpp11/protect.hpp
+++ b/inst/include/cpp11/protect.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <csetjmp>    // for longjmp, setjmp, jmp_buf
diff --git a/inst/include/cpp11/r_bool.hpp b/inst/include/cpp11/r_bool.hpp
index a66e77dc1..a397166d5 100644
--- a/inst/include/cpp11/r_bool.hpp
+++ b/inst/include/cpp11/r_bool.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <limits>  // for numeric_limits
diff --git a/inst/include/cpp11/r_string.hpp b/inst/include/cpp11/r_string.hpp
index 25022aa7b..1dd7dce20 100644
--- a/inst/include/cpp11/r_string.hpp
+++ b/inst/include/cpp11/r_string.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <string>       // for string, basic_string, operator==
diff --git a/inst/include/cpp11/r_vector.hpp b/inst/include/cpp11/r_vector.hpp
index a9848596b..27ff76915 100644
--- a/inst/include/cpp11/r_vector.hpp
+++ b/inst/include/cpp11/r_vector.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <stddef.h>  // for ptrdiff_t, size_t
diff --git a/inst/include/cpp11/raws.hpp b/inst/include/cpp11/raws.hpp
index 218b4bb90..b8b87fad8 100644
--- a/inst/include/cpp11/raws.hpp
+++ b/inst/include/cpp11/raws.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <algorithm>         // for min
diff --git a/inst/include/cpp11/sexp.hpp b/inst/include/cpp11/sexp.hpp
index aceeff3fc..27edf942f 100644
--- a/inst/include/cpp11/sexp.hpp
+++ b/inst/include/cpp11/sexp.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <stddef.h>  // for size_t
diff --git a/inst/include/cpp11/strings.hpp b/inst/include/cpp11/strings.hpp
index c72d25b8f..90bad4b30 100644
--- a/inst/include/cpp11/strings.hpp
+++ b/inst/include/cpp11/strings.hpp
@@ -1,5 +1,5 @@
-// cpp11 version: 0.5.1
-// vendored on: 2024-12-07
+// cpp11 version: 0.5.2
+// vendored on: 2025-03-09
 #pragma once
 
 #include <initializer_list>  // for initializer_list