diff --git a/.ci/docker/ci_commit_pins/pytorch.txt b/.ci/docker/ci_commit_pins/pytorch.txt
index bbae77aa463..61b7ab7807e 100644
--- a/.ci/docker/ci_commit_pins/pytorch.txt
+++ b/.ci/docker/ci_commit_pins/pytorch.txt
@@ -1 +1 @@
-556fc09a9f67f24ca5591ec049c5d0c347c5f62a
+b31bad1b8f1331bf43d47f46602cf6141db56844
diff --git a/install_requirements.py b/install_requirements.py
index b84e250cf87..4a8d9ed8870 100644
--- a/install_requirements.py
+++ b/install_requirements.py
@@ -130,7 +130,11 @@ def install_optional_example_requirements(use_pytorch_nightly):
             if use_pytorch_nightly
             else "torchvision"
         ),
-        f"torchaudio==2.8.0.{NIGHTLY_VERSION}" if use_pytorch_nightly else "torchaudio",
+        (
+            f"torchaudio==2.10.0.{NIGHTLY_VERSION}"
+            if use_pytorch_nightly
+            else "torchaudio"
+        ),
     ]
     # Then install domain libraries
     subprocess.run(
diff --git a/runtime/core/portable_type/c10/torch/headeronly/macros/Macros.h b/runtime/core/portable_type/c10/torch/headeronly/macros/Macros.h
index e340e7626a0..7c46eda0912 100644
--- a/runtime/core/portable_type/c10/torch/headeronly/macros/Macros.h
+++ b/runtime/core/portable_type/c10/torch/headeronly/macros/Macros.h
@@ -611,4 +611,60 @@ __host__ __device__
 #define C10_RETURN_MOVE_IF_OLD_COMPILER 0
 #endif
 
+// The HIDDEN_NAMESPACE_BEGIN and HIDDEN_NAMESPACE_END below
+// are needed for maintaining robustness in our header APIs in
+// torch/headeronly and torch/csrc/stable under the namespaces
+// torch::headeronly and torch::stable respectively. We enforce
+// hidden visibility for these APIs because we want to enable
+// loading custom extensions compiled against different libtorch
+// versions where these APIs may have changed.
+
+// Helper macros for nested namespace expansion
+#define _EXPAND(...) __VA_ARGS__
+
+// Macros to handle 1-3 hidden namespace levels when not windows
+#define _HIDDEN_NS_GET_MACRO(_1, _2, _3, NAME, ...) NAME
+#define _HIDDEN_NS_1(n1) namespace n1 __attribute__((visibility("hidden"))) {
+#define _HIDDEN_NS_2(n1, n2) \
+  namespace n1 {             \
+  namespace n2 __attribute__((visibility("hidden"))) {
+#define _HIDDEN_NS_3(n1, n2, n3) \
+  namespace n1::n2 {             \
+  namespace n3 __attribute__((visibility("hidden"))) {
+
+// Macros to close namespaces when not windows
+#define _HIDDEN_NS_END_1(n1) }
+#define _HIDDEN_NS_END_N(n1, ...) \
+  }                               \
+  }
+
+// Macros to join strs with :: (for win, where symbols are hidden by default)
+#define _JOIN_GET_MACRO(_1, _2, _3, NAME, ...) NAME
+#define _JOIN_NS1(a) a
+#define _JOIN_NS2(a, b) a::b
+#define _JOIN_NS3(a, b, c) a::b::c
+
+#if !defined(HIDDEN_NAMESPACE_BEGIN)
+#if defined(__GNUG__) && !defined(_WIN32)
+#define HIDDEN_NAMESPACE_BEGIN(...) \
+  _EXPAND(_HIDDEN_NS_GET_MACRO(     \
+      __VA_ARGS__, _HIDDEN_NS_3, _HIDDEN_NS_2, _HIDDEN_NS_1)(__VA_ARGS__))
+#else
+#define HIDDEN_NAMESPACE_BEGIN(...)  \
+  namespace _EXPAND(_JOIN_GET_MACRO( \
+      __VA_ARGS__, _JOIN_NS3, _JOIN_NS2, _JOIN_NS1)(__VA_ARGS__)) {
+#endif
+#endif
+
+#if !defined(HIDDEN_NAMESPACE_END)
+#if defined(__GNUG__) && !defined(_WIN32)
+#define HIDDEN_NAMESPACE_END(...)                                         \
+  _EXPAND(_HIDDEN_NS_GET_MACRO(                                           \
+      __VA_ARGS__, _HIDDEN_NS_END_N, _HIDDEN_NS_END_N, _HIDDEN_NS_END_1)( \
+      __VA_ARGS__))
+#else
+#define HIDDEN_NAMESPACE_END(...) }
+#endif
+#endif
+
 #endif // C10_MACROS_MACROS_H_
diff --git a/runtime/core/portable_type/c10/torch/headeronly/util/BFloat16.h b/runtime/core/portable_type/c10/torch/headeronly/util/BFloat16.h
index ac47e3f844a..64479ba36f1 100644
--- a/runtime/core/portable_type/c10/torch/headeronly/util/BFloat16.h
+++ b/runtime/core/portable_type/c10/torch/headeronly/util/BFloat16.h
@@ -395,7 +395,7 @@ inline C10_HOST_DEVICE bool operator<(BFloat16& lhs, BFloat16& rhs) {
 C10_CLANG_DIAGNOSTIC_POP()
 } // namespace c10
 
-namespace torch::headeronly {
+HIDDEN_NAMESPACE_BEGIN(torch, headeronly)
 
 namespace detail {
 using c10::detail::bits_from_f32;
@@ -415,7 +415,7 @@ using c10::operator/=;
 using c10::operator<;
 using c10::operator>;
 using c10::operator<<;
-} // namespace torch::headeronly
+HIDDEN_NAMESPACE_END(torch, headeronly)
 
 namespace std {
 
diff --git a/runtime/core/portable_type/c10/torch/headeronly/util/Half.h b/runtime/core/portable_type/c10/torch/headeronly/util/Half.h
index 9673301e2de..a9c0b166ba2 100644
--- a/runtime/core/portable_type/c10/torch/headeronly/util/Half.h
+++ b/runtime/core/portable_type/c10/torch/headeronly/util/Half.h
@@ -698,7 +698,7 @@ C10_CLANG_DIAGNOSTIC_POP()
 
 } // namespace c10
 
-namespace torch::headeronly {
+HIDDEN_NAMESPACE_BEGIN(torch, headeronly)
 
 using c10::Half;
 using c10::operator+;
@@ -724,7 +724,7 @@ using c10::detail::fp16_ieee_to_fp32_bits;
 using c10::detail::fp16_ieee_to_fp32_value;
 } // namespace detail
 
-} // namespace torch::headeronly
+HIDDEN_NAMESPACE_END(torch, headeronly)
 
 namespace std {
 
diff --git a/runtime/core/portable_type/c10/torch/headeronly/util/TypeSafeSignMath.h b/runtime/core/portable_type/c10/torch/headeronly/util/TypeSafeSignMath.h
index 561ea0467a0..f41269082d9 100644
--- a/runtime/core/portable_type/c10/torch/headeronly/util/TypeSafeSignMath.h
+++ b/runtime/core/portable_type/c10/torch/headeronly/util/TypeSafeSignMath.h
@@ -139,10 +139,10 @@ inline constexpr bool less_than_lowest(const T& x) {
 
 C10_CLANG_DIAGNOSTIC_POP()
 
-namespace torch::headeronly {
+HIDDEN_NAMESPACE_BEGIN(torch, headeronly)
 using c10::greater_than_max;
 using c10::is_negative;
 using c10::less_than_lowest;
 using c10::signs_differ;
 using c10::signum;
-} // namespace torch::headeronly
+HIDDEN_NAMESPACE_END(torch, headeronly)
diff --git a/runtime/core/portable_type/c10/torch/headeronly/util/bit_cast.h b/runtime/core/portable_type/c10/torch/headeronly/util/bit_cast.h
index 334ba5b8e5b..3f357f8a06a 100644
--- a/runtime/core/portable_type/c10/torch/headeronly/util/bit_cast.h
+++ b/runtime/core/portable_type/c10/torch/headeronly/util/bit_cast.h
@@ -13,7 +13,7 @@
 #endif // __has_include(<bit>) && (__cplusplus >= 202002L ||
        // (defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L))
 
-namespace torch::headeronly {
+HIDDEN_NAMESPACE_BEGIN(torch, headeronly)
 
 #if C10_HAVE_STD_BIT_CAST
 using std::bit_cast;
@@ -43,7 +43,7 @@ bit_cast(const From& src) noexcept {
 #endif // C10_HAVE_STD_BIT_CAST
 #undef C10_HAVE_STD_BIT_CAST
 
-} // namespace torch::headeronly
+HIDDEN_NAMESPACE_END(torch, headeronly)
 
 namespace c10 {
 using torch::headeronly::bit_cast;
diff --git a/runtime/core/portable_type/c10/torch/headeronly/util/complex.h b/runtime/core/portable_type/c10/torch/headeronly/util/complex.h
index e0a356436ac..733a22d5dbb 100644
--- a/runtime/core/portable_type/c10/torch/headeronly/util/complex.h
+++ b/runtime/core/portable_type/c10/torch/headeronly/util/complex.h
@@ -590,7 +590,7 @@ struct alignas(4) complex<Half> {
 
 } // namespace c10
 
-namespace torch::headeronly {
+HIDDEN_NAMESPACE_BEGIN(torch, headeronly)
 using c10::complex;
 using c10::operator+;
 using c10::operator-;
@@ -611,6 +611,6 @@ using c10::complex_literals::operator""_if;
 using c10::complex_literals::operator""_id;
 } // namespace complex_literals
 
-} // namespace torch::headeronly
+HIDDEN_NAMESPACE_END(torch, headeronly)
 
 C10_CLANG_DIAGNOSTIC_POP()
diff --git a/runtime/core/portable_type/c10/torch/headeronly/util/floating_point_utils.h b/runtime/core/portable_type/c10/torch/headeronly/util/floating_point_utils.h
index c469cc6a4f6..1e60bd85c10 100644
--- a/runtime/core/portable_type/c10/torch/headeronly/util/floating_point_utils.h
+++ b/runtime/core/portable_type/c10/torch/headeronly/util/floating_point_utils.h
@@ -4,7 +4,7 @@
 #include <torch/headeronly/util/bit_cast.h>
 #include <cstdint>
 
-namespace torch::headeronly::detail {
+HIDDEN_NAMESPACE_BEGIN(torch, headeronly, detail)
 
 C10_HOST_DEVICE inline float fp32_from_bits(uint32_t w) {
 #if defined(__OPENCL_VERSION__)
@@ -30,7 +30,7 @@ C10_HOST_DEVICE inline uint32_t fp32_to_bits(float f) {
 #endif
 }
 
-} // namespace torch::headeronly::detail
+HIDDEN_NAMESPACE_END(torch, headeronly, detail)
 
 namespace c10::detail {
 using torch::headeronly::detail::fp32_from_bits;
diff --git a/torch_pin.py b/torch_pin.py
index 811d81279b7..ffdde14bdb5 100644
--- a/torch_pin.py
+++ b/torch_pin.py
@@ -1,2 +1,2 @@
 TORCH_VERSION = "2.10.0"
-NIGHTLY_VERSION = "dev20251017"
+NIGHTLY_VERSION = "dev20251025"