diff --git a/CHANGELOG.md b/CHANGELOG.md
index 705010f..0823cd9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -48,6 +48,7 @@ Things to be included in the next release go here.
 ### Removed
 
 - Python 3.8 support has been removed from the package. The minimum supported version is now Python 3.9.
+- Removed unused instrument series models (MSO64, MSO54, MSO24, etc.) from InstrumentSeries enum.
 
 ### Added
 
diff --git a/src/tm_data_types/helpers/instrument_series.py b/src/tm_data_types/helpers/instrument_series.py
index 631b6a0..9b1a2b3 100644
--- a/src/tm_data_types/helpers/instrument_series.py
+++ b/src/tm_data_types/helpers/instrument_series.py
@@ -34,10 +34,3 @@ class InstrumentSeries(Enum):
         slot_ids=5,
         gen_purpose_default=0,
     )
-    MSO64 = TEKSCOPE
-    MSO64B = TEKSCOPE  # noqa: PIE796
-    MSO54 = TEKSCOPE  # noqa: PIE796
-    MSO54B = TEKSCOPE  # noqa: PIE796
-    MSO44 = TEKSCOPE  # noqa: PIE796
-    MSO44B = TEKSCOPE  # noqa: PIE796
-    MSO24 = TEKSCOPE  # noqa: PIE796