diff --git a/CHANGELOG.md b/CHANGELOG.md
index 11f1950..0c3bfdf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # autocue changelog
 
+### 2024-07-04 – v4.0.6
+
+- Make `duration` non-overridable by existing metadata or annotations.
+  - The real file duration is not a tag, but determined otherwise.
+  - If such a tag is found, it is typically unusable, incorrect or in a different format.
+  - AzuraCast might annotate the duration from an earlier version of the file, because the media scan is only done once in a while. With frequently changing files of the same name, like syndicated news or time announcements, this could be problematic.
+
 ### 2024-07-02 – v4.0.5
 
 - Fixed a situation where `cue_file` would read a string duration from ffprobe for audio stream \#0, which led to an error in the AzuraCast log like this:
diff --git a/autocue.cue_file.liq b/autocue.cue_file.liq
index 3d086ea..69a6ad8 100644
--- a/autocue.cue_file.liq
+++ b/autocue.cue_file.liq
@@ -39,6 +39,8 @@
 #                           most people seem to want transitions a bit tighter
 # 2024-07-01 - Moonbase59 - v4.0.4 - Sync with cue_file version
 # 2024-07-02 - Moonbase59 - v4.0.5 - Sync with cue_file version
+# 2024-07-04 - Moonbase59 - v4.0.6 - Make duration non-overridable, i.e.,
+#                           it’s ALWAYS taken from the cue_file result.
 
 # Lots of debugging output for AzuraCast in this, will be removed eventually.
 
@@ -52,7 +54,7 @@ let settings.autocue.cue_file.version =
   settings.make(
     description=
       "Software version of autocue.cue_file. Should coincide with `cue_file`.",
-    "4.0.5"
+    "4.0.6"
   )
 
 # Internal only! Not a user setting.
@@ -204,6 +206,15 @@ let settings.autocue.cue_file.use_json_metadata =
     true
   )
 
+let settings.autocue.cue_file.ignored_overrides =
+  settings.make(
+    description=
+      'List of cue_file results that cannot be overridden by existing \
+       metadata or annotations. One such field is `duration`, as it is not \
+       a tag, and determined otherwise.',
+    ['duration']
+  )
+
 stdlib_metadata = metadata
 
 # metadata.json.stringify only exports a limited set, use our own
@@ -450,21 +461,6 @@ def cue_file(~request_metadata, ~file_metadata, filename) =
       end
     end
 
-    # # Handle annotated `liq_blankskip`, the ultimate switch
-    # # Pre-v3.0.0 compatibility: Check for true/false (now float)
-    # if list.assoc.mem("liq_blankskip", meta) then
-    #   b = meta["liq_blankskip"]
-    #   if b == "true" then
-    #     blankskip := blankskip()
-    #   elsif b == "false" then
-    #     blankskip := 0.0
-    #   else
-    #     blankskip := float_of_string(default=0.0, b)
-    #   end
-    #   m := list.assoc.remove("liq_blankskip", m())
-    #   m := list.add(("liq_blankskip", string.float(decimal_places=2, blankskip())), m())
-    # end
-
     # Handle annotated `liq_blankskip`, the ultimate switch
     # Pre-v3.0.0 compatibility: Check for true/false (now float)
     if list.assoc.mem("liq_blankskip", meta) then
@@ -642,13 +638,19 @@ def cue_file(~request_metadata, ~file_metadata, filename) =
       )
 
       # only use calculated values if not already annotated in AzuraCast
-      # so we don't overwrite manually set values in the database
+      # so we don't overwrite manually set values in the database,
+      # except for non-overridable values like `duration`, which are
+      # ALWAYS taken from the cue_file result.
       result := list.fold(
         fun(res, entry) ->
           if list.assoc.mem(fst(entry), res) then
-            res
+            if list.mem(fst(entry), settings.autocue.cue_file.ignored_overrides()) then
+              [...list.assoc.remove(fst(entry), res), entry]  # take cue_file result
+            else
+              res  # take existing metadata
+            end
           else
-            [...res, entry]
+            [...res, entry]  # append new metadata
           end,
           m(),
           result()
diff --git a/cue_file b/cue_file
index bab04ad..bbd476c 100755
--- a/cue_file
+++ b/cue_file
@@ -64,13 +64,14 @@
 #                       - streamline tag conversion code a little
 #                       - only write known tags, not all `liq_*`
 # 2024-07-02 Moonbase59 - v4.0.5 Fix minor bugs with file duration
+# 2024-07-04 Moonbase59 - v4.0.6 Sync version with autocue.cue_file.liq
 #
 # Originally based on an idea and some code by John Warburton (@Warblefly):
 #   https://github.com/Warblefly/TrackBoundaries
 # Some collaborative work with RM-FM (@RM-FM): Sustained ending analysis.
 
 __author__ = 'Matthias C. Hormann'
-__version__ = '4.0.5'
+__version__ = '4.0.6'
 
 import os
 import sys