diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53adb48..eabbddf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 2.6.2
+## 2.6.3
 
 ### Fixed: SBOM fetch failures no longer produce empty reports
 
@@ -13,6 +13,21 @@
   instead of raising, and individual unparseable artifacts are skipped rather
   than failing the whole response.
 
+### Changed: bump pinned @coana-tech/cli to 15.10.4
+
+- Bumped the pinned reachability engine (`@coana-tech/cli`) from `15.10.3` to
+  `15.10.4`. See the [Coana changelogs](https://docs.coana.tech/changelogs) for
+  engine changes.
+
+### Changed: dependency updates and dev/test dependency pinning
+
+- Bumped pinned runtime dependencies (`beautifulsoup4` `4.15.0`,
+  `markdown` `3.10.3`).
+- Pinned the `test` and `dev` dependency groups to exact versions, extending
+  the exact-pinning policy introduced in 2.6.0 to all dependency groups.
+- Updated GitHub Actions used in CI workflows. No effect on the installed
+  CLI.
+
 ## 2.6.1
 
 ### Changed: scan comparison now polls the diff-scans endpoints
diff --git a/docs/cli-reference.md b/docs/cli-reference.md
index 9f4ca88..7d4f85c 100644
--- a/docs/cli-reference.md
+++ b/docs/cli-reference.md
@@ -275,7 +275,7 @@ If you don't want to provide the Socket API Token every time then you can use th
 | Parameter                        | Required | Default | Description                                                                                                                |
 |:---------------------------------|:---------|:--------|:---------------------------------------------------------------------------------------------------------------------------|
 | `--reach`                          | False    | False   | Enable reachability analysis to identify which vulnerable functions are actually called by your code. Creates a full application reachability scan (`scan_type=socket_tier1`). |
-| `--reach-version`                  | False    | 15.10.3 | Version of @coana-tech/cli to use. Defaults to the pinned version that ships with this CLI release, so the engine only changes when you upgrade the Socket CLI. Pass `latest` to always use the newest published version (opt-in auto-update), or an explicit version (e.g. `1.2.3`) to pin it. |
+| `--reach-version`                  | False    | 15.10.4 | Version of @coana-tech/cli to use. Defaults to the pinned version that ships with this CLI release, so the engine only changes when you upgrade the Socket CLI. Pass `latest` to always use the newest published version (opt-in auto-update), or an explicit version (e.g. `1.2.3`) to pin it. |
 | `--reach-analysis-timeout`         | False    | 10m     | Timeout for each reachability analysis run, e.g. `90s`, `10m` or `1h`. Omitted by default, so coana applies its own default (`10m`). Alias: `--reach-timeout` |
 | `--reach-analysis-memory-limit`    | False    | 8GB     | Memory limit for each reachability analysis run, e.g. `512MB` or `8GB`. Omitted by default, so coana applies its own default (`8GB`). Alias: `--reach-memory-limit` |
 | `--reach-concurrency`              | False    | 1       | Control parallel analysis execution (must be >= 1). Omitted by default, so coana applies its own default.                  |
diff --git a/pyproject.toml b/pyproject.toml
index 8275fdb..f325c07 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "socketsecurity"
-version = "2.6.2"
+version = "2.6.3"
 requires-python = ">= 3.11"
 license = {"file" = "LICENSE"}
 dependencies = [
diff --git a/socketsecurity/__init__.py b/socketsecurity/__init__.py
index c4c8bad..88ac823 100644
--- a/socketsecurity/__init__.py
+++ b/socketsecurity/__init__.py
@@ -1,3 +1,3 @@
 __author__ = 'socket.dev'
-__version__ = '2.6.2'
+__version__ = '2.6.3'
 USER_AGENT = f'SocketPythonCLI/{__version__}'
diff --git a/socketsecurity/core/tools/reachability.py b/socketsecurity/core/tools/reachability.py
index 34d7909..d0fdd07 100644
--- a/socketsecurity/core/tools/reachability.py
+++ b/socketsecurity/core/tools/reachability.py
@@ -18,7 +18,7 @@
 # Pinned @coana-tech/cli version. Bumped deliberately per Python CLI release so the
 # reachability engine version only changes through a standard pip upgrade (advance notice).
 # Pass --reach-version latest to opt into the newest published version instead.
-DEFAULT_COANA_CLI_VERSION: Final = "15.10.3"
+DEFAULT_COANA_CLI_VERSION: Final = "15.10.4"
 
 # Resolved @coana-tech/cli script paths from the npm-install fallback, keyed by version.
 # Lives for the process lifetime so repeated fallback invocations install only once
@@ -55,7 +55,7 @@ def __init__(self, sdk: socketdev, api_token: str):
     
     def _resolve_coana_package_spec(self, version: Optional[str] = None) -> str:
         """
-        Resolve the @coana-tech/cli package spec to run (e.g. '@coana-tech/cli@15.10.3').
+        Resolve the @coana-tech/cli package spec to run (e.g. '@coana-tech/cli@15.10.4').
 
         Args:
             version: Coana CLI version to use.
@@ -64,7 +64,7 @@ def _resolve_coana_package_spec(self, version: Optional[str] = None) -> str:
                 - '<semver>': that exact version.
 
         Returns:
-            str: The package specifier to use with npx (e.g. '@coana-tech/cli@15.10.3').
+            str: The package specifier to use with npx (e.g. '@coana-tech/cli@15.10.4').
         """
         return f"@coana-tech/cli@{self._resolve_coana_version(version)}"
 
diff --git a/uv.lock b/uv.lock
index 5851670..ffc1224 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1282,7 +1282,7 @@ wheels = [
 
 [[package]]
 name = "socketsecurity"
-version = "2.6.2"
+version = "2.6.3"
 source = { editable = "." }
 dependencies = [
     { name = "beautifulsoup4" },