diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7f101a2..2c43510 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@ Changelog
 
 <!--next-version-placeholder-->
 
+## v3.6.0 (2023-02-18)
+### Feature
+* **audio_codec:** Detect "DTS:X" (closes #728) ([`2bdd8f5`](https://github.com/guessit-io/guessit/commit/2bdd8f568a0fa6c5eb97e1f29d5e4d488d86a2aa))
+
 ## v3.5.0 (2022-11-01)
 ### Feature
 * **dependencies:** Drop Python 3.6 support ([`47f5718`](https://github.com/guessit-io/guessit/commit/47f57184a9d0a25c1b415638d0b003dad88ce607))
diff --git a/guessit/__version__.py b/guessit/__version__.py
index 71a0062..46c053f 100644
--- a/guessit/__version__.py
+++ b/guessit/__version__.py
@@ -4,4 +4,4 @@
 Version module
 """
 # pragma: no cover
-__version__ = '3.5.0'
+__version__ = '3.6.0'
diff --git a/guessit/config/options.json b/guessit/config/options.json
index 61c460e..9adac64 100644
--- a/guessit/config/options.json
+++ b/guessit/config/options.json
@@ -62,6 +62,7 @@
         "FLAC": "Flac",
         "DTS": "DTS",
         "DTS-HD": {"regex":  ["DTS-?HD", "DTS(?=-?MA)"], "conflict_solver": "lambda match, other: other if other.name == 'audio_codec' else '__default__'"},
+        "DTS:X": {"string": ["DTS:X", "DTS-X", "DTSX"] },
         "Dolby TrueHD": {"regex": ["True-?HD"] },
         "Opus": "Opus",
         "Vorbis": "Vorbis",
diff --git a/guessit/test/movies.yml b/guessit/test/movies.yml
index ff4232a..9b3a7be 100644
--- a/guessit/test/movies.yml
+++ b/guessit/test/movies.yml
@@ -1711,6 +1711,20 @@
   release_group: LAZY
   type: movie
 
+? The.Movie.2016.2160p.UHD.BluRay.REMUX.HDR.HEVC.DTS-X-NOGROUP
+: title: The Movie
+  year: 2016
+  screen_size: 2160p
+  source: Ultra HD Blu-ray
+  other:
+  - HDR10
+  - Remux
+  video_codec: H.265
+  video_profile: High Efficiency Video Coding
+  audio_codec: DTS:X
+  release_group: NOGROUP
+  type: movie
+
 ? Test (2013) [WEBDL-1080p] [x264 AC3] [ENG+RU+PT] [NTb].mkv
 : title: Test
   year: 2013
diff --git a/guessit/test/rules/audio_codec.yml b/guessit/test/rules/audio_codec.yml
index 6c937b8..b215751 100644
--- a/guessit/test/rules/audio_codec.yml
+++ b/guessit/test/rules/audio_codec.yml
@@ -120,6 +120,11 @@
 : audio_codec: DTS
   audio_profile: Extended Surround
 
+? DTS:X
+? DTS-X
+? DTSX
+: audio_codec: DTS:X
+
 ? DD-EX
 ? DDEX
 ? -EX