diff --git a/.github/workflows/debug.yaml b/.github/workflows/debug.yaml
index 19372a0d..9ebc6ebf 100644
--- a/.github/workflows/debug.yaml
+++ b/.github/workflows/debug.yaml
@@ -10,11 +10,12 @@ jobs:
         profile: [
           { rust: "1.65", features: "" },
           { rust: "1.65", features: "--features=yyjson" },
-          { rust: "nightly-2024-01-17", features: "--features=yyjson,unstable-simd" },
+          { rust: "nightly-2024-02-01", features: "--features=yyjson,unstable-simd" },
         ]
         python: [
-          { version: '3.12', abi: 'cp312-cp312' },
-          { version: '3.8', abi: 'cp38-cp38' },
+          { version: '3.13' },
+          { version: '3.12' },
+          { version: '3.8' },
         ]
     env:
       CC: "gcc"
@@ -26,7 +27,9 @@ jobs:
 
     - uses: actions/setup-python@v5
       with:
+        allow-prereleases: true
         python-version: '${{ matrix.python.version }}'
+
     - run: python -m pip install --user --upgrade pip "maturin>=1,<2" wheel
 
     - uses: actions/checkout@v4
@@ -43,9 +46,15 @@ jobs:
     - run: python -m pip install --user -r test/requirements.txt -r integration/requirements.txt
 
     - run: pytest -s -rxX -v test
+      timeout-minutes: 4
       env:
         PYTHONMALLOC: "debug"
 
     - run: ./integration/run thread
+      timeout-minutes: 2
+
     - run: ./integration/run http
+      timeout-minutes: 2
+
     - run: ./integration/run init
+      timeout-minutes: 2
diff --git a/.github/workflows/linux.yaml b/.github/workflows/linux.yaml
index 744bef39..95dcc925 100644
--- a/.github/workflows/linux.yaml
+++ b/.github/workflows/linux.yaml
@@ -71,8 +71,8 @@ jobs:
       options: --user 0
     steps:
     - run: yum install -y clang lld
-    - run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly-2024-01-17 --profile minimal -y
-    - run: rustup component add rust-src --toolchain nightly-2024-01-17-x86_64-unknown-linux-gnu
+    - run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly-2024-02-01 --profile minimal -y
+    - run: rustup component add rust-src --toolchain nightly-2024-02-01-x86_64-unknown-linux-gnu
     - uses: actions/checkout@v4
 
     - name: build-std
@@ -143,7 +143,7 @@ jobs:
         RUSTFLAGS: "-C target-feature=-crt-static"
         CARGO_UNSTABLE_SPARSE_REGISTRY: "true"
       with:
-        rust-toolchain: nightly-2024-01-17
+        rust-toolchain: nightly-2024-02-01
         rustup-components: rust-src
         target: ${{ matrix.platform.target }}
         manylinux: musllinux_1_1
@@ -238,7 +238,7 @@ jobs:
         RUSTFLAGS: "${{ matrix.target.rustflags }}"
       with:
         target: ${{ matrix.target.target }}
-        rust-toolchain: nightly-2024-01-17
+        rust-toolchain: nightly-2024-02-01
         rustup-components: rust-src
         manylinux: auto
         args: --release --strip --out=dist --features=${{ matrix.target.features }} -i python${{ matrix.python.version }}
diff --git a/Cargo.lock b/Cargo.lock
index 838bfcf7..10865605 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -77,9 +77,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.31"
+version = "0.4.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f2c685bad3eb3d45a01354cedb7d5faa66194d1d58ba6e267a8de788f79db38"
+checksum = "9f13690e35a5e4ace198e7beea2895d29f3a9cc55015fcebe6336bd2010af9eb"
 dependencies = [
  "num-traits",
 ]
@@ -161,15 +161,15 @@ checksum = "9028f49264629065d057f340a86acb84867925865f73bbf8d47b4d149a7e88b8"
 
 [[package]]
 name = "libc"
-version = "0.2.152"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13e3bf6590cbc649f4d1a3eefc9d5d6eb746f5200ffb04e5e142700b8faa56e7"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "no-panic"
-version = "0.1.28"
+version = "0.1.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc56831a2ae584dc43a8b0b33f496e71fb4d43cf8c1c0a3fd932e6340bea1f81"
+checksum = "c711522eedec2a96bb3672ad60a03561cb28934ab1e9b97d2ecb58e07c79ef52"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -219,9 +219,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.76"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95fc56cda0b5c3325f5fbbd7ff9fda9e02bb00bb3dac51252d2f1bfa1cb8cc8c"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
@@ -272,18 +272,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.195"
+version = "1.0.196"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "63261df402c67811e9ac6def069e4786148c4563f4b50fd4bf30aa370d626b02"
+checksum = "870026e60fa08c69f064aa766c10f10b1d62db9ccd4d0abb206472bee0ce3b32"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.195"
+version = "1.0.196"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46fe8f8603d81ba86327b23a2e9cdf49e1255fb94a4c5f297f6ee0547178ea2c"
+checksum = "33c85360c95e7d137454dc81d9a4ed2b8efd8fbe19cee57357b32b9771fccb67"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -292,9 +292,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.111"
+version = "1.0.113"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "176e46fa42316f18edd598015a5166857fc835ec732f5215eac6b7bdbf0a84f4"
+checksum = "69801b70b1c3dac963ecb03a364ba0ceda9cf60c71cfe475e99864759c8b8a79"
 dependencies = [
  "itoa",
  "ryu",
@@ -309,9 +309,9 @@ checksum = "f27f6278552951f1f2b8cf9da965d10969b2efdea95a6ec47987ab46edfe263a"
 
 [[package]]
 name = "smallvec"
-version = "1.12.0"
+version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2593d31f82ead8df961d8bd23a64c2ccf2eb5dd34b0a34bfb4dd54011c72009e"
+checksum = "e6ecd384b10a64542d77071bd64bd7b231f4ed5940fba55e98c3de13824cf3d7"
 
 [[package]]
 name = "static_assertions"
diff --git a/Cargo.toml b/Cargo.toml
index c2cf4578..08fff9e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,13 +14,13 @@ keywords = ["fast", "json", "dataclass", "dataclasses", "datetime", "rfc", "8259
 include = [
     "Cargo.toml",
     "CHANGELOG.md",
-    "data/*",
+    "data",
     "include",
     "LICENSE-APACHE",
     "LICENSE-MIT",
     "pyproject.toml",
     "README.md",
-    "src/*",
+    "src",
     "test/*.py",
     "test/requirements.txt",
 ]
diff --git a/README.md b/README.md
index ff72e3e5..685d6da8 100644
--- a/README.md
+++ b/README.md
@@ -1196,7 +1196,7 @@ It benefits from also having a C build environment to compile a faster
 deserialization backend. See this project's `manylinux_2_28` builds for an
 example using clang and LTO.
 
-The project's own CI tests against `nightly-2024-01-17` and stable 1.65. It
+The project's own CI tests against `nightly-2024-02-01` and stable 1.65. It
 is prudent to pin the nightly version because that channel can introduce
 breaking changes.
 
diff --git a/ci/azure-pipelines.yml b/ci/azure-pipelines.yml
index c47945bd..a20411fd 100644
--- a/ci/azure-pipelines.yml
+++ b/ci/azure-pipelines.yml
@@ -1,5 +1,5 @@
 variables:
-  toolchain: nightly-2024-01-17
+  toolchain: nightly-2024-02-01
 
 jobs:
 
diff --git a/src/util.rs b/src/util.rs
index a51dc633..1e21b144 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -238,12 +238,20 @@ macro_rules! use_immortal {
     };
 }
 
+#[cfg(not(Py_3_13))]
 macro_rules! pydict_next {
     ($obj1:expr, $obj2:expr, $obj3:expr, $obj4:expr) => {
         unsafe { pyo3_ffi::_PyDict_Next($obj1, $obj2, $obj3, $obj4, std::ptr::null_mut()) }
     };
 }
 
+#[cfg(Py_3_13)]
+macro_rules! pydict_next {
+    ($obj1:expr, $obj2:expr, $obj3:expr, $obj4:expr) => {
+        unsafe { pyo3_ffi::PyDict_Next($obj1, $obj2, $obj3, $obj4) }
+    };
+}
+
 macro_rules! reserve_minimum {
     ($writer:expr) => {
         $writer.reserve(64);
diff --git a/test/test_type.py b/test/test_type.py
index 35ca8aeb..33297d0b 100644
--- a/test/test_type.py
+++ b/test/test_type.py
@@ -49,6 +49,10 @@ def test_str_long(self):
         for obj in ("aaaa" * 1024, "üýþÿ" * 1024, "好" * 1024, "�" * 1024):
             assert orjson.loads(orjson.dumps(obj)) == obj
 
+    def test_str_2mib(self):
+        ref = '🐈🐈🐈🐈🐈"üýa0s9999🐈🐈🐈🐈🐈9\0999\\9999' * 1024 * 50
+        assert orjson.loads(orjson.dumps(ref)) == ref
+
     def test_str_very_long(self):
         """
         str long enough to trigger overflow in bytecount
@@ -524,14 +528,30 @@ def test_dict(self):
     def test_dict_duplicate_loads(self):
         assert orjson.loads(b'{"1":true,"1":false}') == {"1": False}
 
-    def test_dict_large(self):
+    def test_dict_large_dict(self):
         """
         dict with >512 keys
         """
-        obj = {"key_%s" % idx: "value" for idx in range(513)}
+        obj = {"key_%s" % idx: [{}, {"a": [{}, {}, {}]}, {}]  for idx in range(513)}
         assert len(obj) == 513
         assert orjson.loads(orjson.dumps(obj)) == obj
 
+    def test_dict_large_4096(self):
+        """
+        dict with >4096 keys
+        """
+        obj = {"key_%s" % idx: "value_%s" % idx for idx in range(4097)}
+        assert len(obj) == 4097
+        assert orjson.loads(orjson.dumps(obj)) == obj
+
+    def test_dict_large_65536(self):
+        """
+        dict with >65536 keys
+        """
+        obj = {"key_%s" % idx: "value_%s" % idx for idx in range(65537)}
+        assert len(obj) == 65537
+        assert orjson.loads(orjson.dumps(obj)) == obj
+
     def test_dict_large_keys(self):
         """
         dict with keys too large to cache