diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6014621..0c1a770a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Release Notes
 
+## [v3.1.0] (2025-01-09)
+
+* Add `capture_all` to `instrument_httpx` by @Kludex in [#780](https://github.com/pydantic/logfire/pull/780)
+* Ensure cleanup when forked process ends by @alexmojaki in [#785](https://github.com/pydantic/logfire/pull/785)
+* Generate trace IDs as ULIDs by default by @adriangb in [#783](https://github.com/pydantic/logfire/pull/783)
+
 ## [v3.0.0] (2025-01-07)
 
 * **BREAKING CHANGE**: Removed `capture_request_json_body`, `capture_request_text_body`, `capture_request_form_data`, and `capture_response_json_body` parameters from `logfire.instrument_httpx()`, replaced with `capture_request_body` `capture_response_body` by @Kludex in [#769](https://github.com/pydantic/logfire/pull/769)
@@ -517,3 +523,4 @@ First release from new repo!
 [v2.11.0]: https://github.com/pydantic/logfire/compare/v2.10.0...v2.11.0
 [v2.11.1]: https://github.com/pydantic/logfire/compare/v2.11.0...v2.11.1
 [v3.0.0]: https://github.com/pydantic/logfire/compare/v2.11.1...v3.0.0
+[v3.1.0]: https://github.com/pydantic/logfire/compare/v3.0.0...v3.1.0
diff --git a/logfire-api/logfire_api/_internal/integrations/httpx.pyi b/logfire-api/logfire_api/_internal/integrations/httpx.pyi
index be098f22..d0a94ad8 100644
--- a/logfire-api/logfire_api/_internal/integrations/httpx.pyi
+++ b/logfire-api/logfire_api/_internal/integrations/httpx.pyi
@@ -13,7 +13,7 @@ from typing import Any, Awaitable, Callable, Literal, Mapping, ParamSpec
 
 P = ParamSpec('P')
 
-def instrument_httpx(logfire_instance: Logfire, client: httpx.Client | httpx.AsyncClient | None, capture_headers: bool, capture_request_body: bool, capture_response_body: bool, request_hook: RequestHook | AsyncRequestHook | None, response_hook: ResponseHook | AsyncResponseHook | None, async_request_hook: AsyncRequestHook | None, async_response_hook: AsyncResponseHook | None, **kwargs: Any) -> None:
+def instrument_httpx(logfire_instance: Logfire, client: httpx.Client | httpx.AsyncClient | None, capture_all: bool, capture_headers: bool, capture_request_body: bool, capture_response_body: bool, request_hook: RequestHook | AsyncRequestHook | None, response_hook: ResponseHook | AsyncResponseHook | None, async_request_hook: AsyncRequestHook | None, async_response_hook: AsyncResponseHook | None, **kwargs: Any) -> None:
     """Instrument the `httpx` module so that spans are automatically created for each request.
 
     See the `Logfire.instrument_httpx` method for details.
diff --git a/logfire-api/logfire_api/_internal/main.pyi b/logfire-api/logfire_api/_internal/main.pyi
index 956da860..199b5031 100644
--- a/logfire-api/logfire_api/_internal/main.pyi
+++ b/logfire-api/logfire_api/_internal/main.pyi
@@ -553,11 +553,11 @@ class Logfire:
     def instrument_asyncpg(self, **kwargs: Any) -> None:
         """Instrument the `asyncpg` module so that spans are automatically created for each query."""
     @overload
-    def instrument_httpx(self, client: httpx.Client, *, capture_headers: bool = False, capture_request_body: bool = False, capture_response_body: bool = False, request_hook: HttpxRequestHook | None = None, response_hook: HttpxResponseHook | None = None, **kwargs: Any) -> None: ...
+    def instrument_httpx(self, client: httpx.Client, *, capture_all: bool = False, capture_headers: bool = False, capture_request_body: bool = False, capture_response_body: bool = False, request_hook: HttpxRequestHook | None = None, response_hook: HttpxResponseHook | None = None, **kwargs: Any) -> None: ...
     @overload
-    def instrument_httpx(self, client: httpx.AsyncClient, *, capture_headers: bool = False, capture_request_body: bool = False, capture_response_body: bool = False, request_hook: HttpxRequestHook | HttpxAsyncRequestHook | None = None, response_hook: HttpxResponseHook | HttpxAsyncResponseHook | None = None, **kwargs: Any) -> None: ...
+    def instrument_httpx(self, client: httpx.AsyncClient, *, capture_all: bool = False, capture_headers: bool = False, capture_request_body: bool = False, capture_response_body: bool = False, request_hook: HttpxRequestHook | HttpxAsyncRequestHook | None = None, response_hook: HttpxResponseHook | HttpxAsyncResponseHook | None = None, **kwargs: Any) -> None: ...
     @overload
-    def instrument_httpx(self, client: None = None, *, capture_headers: bool = False, capture_request_body: bool = False, capture_response_body: bool = False, request_hook: HttpxRequestHook | None = None, response_hook: HttpxResponseHook | None = None, async_request_hook: HttpxAsyncRequestHook | None = None, async_response_hook: HttpxAsyncResponseHook | None = None, **kwargs: Any) -> None: ...
+    def instrument_httpx(self, client: None = None, *, capture_all: bool = False, capture_headers: bool = False, capture_request_body: bool = False, capture_response_body: bool = False, request_hook: HttpxRequestHook | None = None, response_hook: HttpxResponseHook | None = None, async_request_hook: HttpxAsyncRequestHook | None = None, async_response_hook: HttpxAsyncResponseHook | None = None, **kwargs: Any) -> None: ...
     def instrument_celery(self, **kwargs: Any) -> None:
         """Instrument `celery` so that spans are automatically created for each task.
 
diff --git a/logfire-api/logfire_api/_internal/ulid.pyi b/logfire-api/logfire_api/_internal/ulid.pyi
new file mode 100644
index 00000000..6a2724c5
--- /dev/null
+++ b/logfire-api/logfire_api/_internal/ulid.pyi
@@ -0,0 +1,29 @@
+from random import Random
+from typing import Callable
+
+def ulid(random: Random, ms_timestamp_generator: Callable[[], int]) -> int:
+    """Generate an integer ULID compatible with UUID v4.
+
+    ULIDs as defined by the [spec](https://github.com/ulid/spec) look like this:
+
+     01AN4Z07BY      79KA1307SR9X4MV3
+    |----------|    |----------------|
+     Timestamp         Randomness
+     48bits            80bits
+
+    In the future it would be nice to make this compatible with a UUID,
+    e.g. v4 UUIDs by setting the version and variant bits correctly.
+    We can't currently do this because setting these bits would leave us with only 7 bytes of randomness,
+    which isn't enough for the Python SDK's sampler that currently expects 8 bytes of randomness.
+    In the future OTEL will probably adopt https://www.w3.org/TR/trace-context-2/#random-trace-id-flag
+    which relies only on the lower 7 bytes of the trace ID, then all SDKs and tooling should be updated
+    and leaving only 7 bytes of randomness should be fine.
+
+    Right now we only care about:
+    - Our SDK / Python SDK's in general.
+    - The OTEL collector.
+
+    And both behave properly with 8 bytes of randomness because trace IDs were originally 64 bits
+    so to be compatible with old trace IDs nothing in OTEL can assume >8 bytes of randomness in trace IDs
+    unless they generated the trace ID themselves (e.g. the Go SDK _does_ expect >8 bytes of randomness internally).
+    """
diff --git a/logfire-api/logfire_api/_internal/utils.pyi b/logfire-api/logfire_api/_internal/utils.pyi
index d99fb228..c1c11086 100644
--- a/logfire-api/logfire_api/_internal/utils.pyi
+++ b/logfire-api/logfire_api/_internal/utils.pyi
@@ -2,6 +2,7 @@ from _typeshed import Incomplete
 from collections.abc import Generator
 from dataclasses import dataclass
 from logfire._internal.stack_info import is_user_code as is_user_code
+from logfire._internal.ulid import ulid as ulid
 from opentelemetry import trace as trace_api
 from opentelemetry.sdk.resources import Resource
 from opentelemetry.sdk.trace import Event as Event, ReadableSpan
@@ -91,7 +92,7 @@ def handle_internal_errors() -> Generator[None]: ...
 def maybe_capture_server_headers(capture: bool): ...
 def is_asgi_send_receive_span_name(name: str) -> bool: ...
 
-@dataclass(repr=True)
+@dataclass(repr=True, eq=True)
 class SeededRandomIdGenerator(IdGenerator):
     """Generate random span/trace IDs from a seed for deterministic tests.
 
diff --git a/logfire-api/pyproject.toml b/logfire-api/pyproject.toml
index b5cdad4f..6d87e9a8 100644
--- a/logfire-api/pyproject.toml
+++ b/logfire-api/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "logfire-api"
-version = "3.0.0"
+version = "3.1.0"
 description = "Shim for the Logfire SDK which does nothing unless Logfire is installed"
 authors = [
     { name = "Pydantic Team", email = "engineering@pydantic.dev" },
diff --git a/pyproject.toml b/pyproject.toml
index cc682032..ff865807 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "logfire"
-version = "3.0.0"
+version = "3.1.0"
 description = "The best Python observability tool! 🪵🔥"
 requires-python = ">=3.8"
 authors = [
diff --git a/uv.lock b/uv.lock
index b1a9e9a8..6ce28a37 100644
--- a/uv.lock
+++ b/uv.lock
@@ -903,7 +903,7 @@ name = "click"
 version = "8.1.8"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "colorama", marker = "platform_system == 'Windows'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/b9/2e/0090cbf739cee7d23781ad4b89a9894a41538e4fcf4c31dcdd705b78eb8b/click-8.1.8.tar.gz", hash = "sha256:ed53c9d8990d83c2a27deae68e4ee337473f6330c040a31d4225c9574d16096a", size = 226593 }
 wheels = [
@@ -1911,7 +1911,7 @@ wheels = [
 
 [[package]]
 name = "logfire"
-version = "3.0.0"
+version = "3.1.0"
 source = { editable = "." }
 dependencies = [
     { name = "executing" },
@@ -2213,7 +2213,7 @@ docs = [
 
 [[package]]
 name = "logfire-api"
-version = "3.0.0"
+version = "3.1.0"
 source = { editable = "logfire-api" }
 
 [package.metadata]
@@ -2437,7 +2437,7 @@ version = "1.6.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "click" },
-    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "colorama", marker = "platform_system == 'Windows'" },
     { name = "ghp-import" },
     { name = "importlib-metadata", marker = "python_full_version < '3.10'" },
     { name = "jinja2" },
@@ -5068,7 +5068,7 @@ name = "tqdm"
 version = "4.67.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "colorama", marker = "platform_system == 'Windows'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/a8/4b/29b4ef32e036bb34e4ab51796dd745cdba7ed47ad142a9f4a1eb8e0c744d/tqdm-4.67.1.tar.gz", hash = "sha256:f8aef9c52c08c13a65f30ea34f4e5aac3fd1a34959879d7e59e63027286627f2", size = 169737 }
 wheels = [