diff --git a/addons/common/XEH_PREP.hpp b/addons/common/XEH_PREP.hpp
index 8a33997f57..e0c44a90ac 100644
--- a/addons/common/XEH_PREP.hpp
+++ b/addons/common/XEH_PREP.hpp
@@ -113,7 +113,6 @@ PREP(isMedic);
 PREP(isModLoaded);
 PREP(isPlayer);
 PREP(isSwimming);
-PREP(isUnderwater);
 PREP(lightIntensityFromObject);
 PREP(loadPerson);
 PREP(loadPersonLocal);
diff --git a/addons/common/functions/fnc_isUnderwater.sqf b/addons/common/functions/fnc_isUnderwater.sqf
deleted file mode 100644
index 0d7d1e50a1..0000000000
--- a/addons/common/functions/fnc_isUnderwater.sqf
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Author: Glowbal
- * Check if unit's head is underwater
- *
- * Arguments:
- * 0: Unit <OBJECT>
- *
- * Return Value:
- * If unit's head is underwater <BOOL>
- *
- * Example:
- * [bob] call ace_common_fnc_isUnderwater
- *
- * Public: Yes
- */
-#include "script_component.hpp"
-
-ACE_DEPRECATED(QFUNC(isUnderwater),"3.13.0","underwater OBJECT");
-
-params [["_unit", objNull, [objNull]]];
-
-private _return = false;
-
-if (surfaceIsWater getPosASL _unit) then {
-    private _pos = _unit modelToWorldVisual (_unit selectionPosition "head");
-
-    if (_pos select 2 < 0) then {
-        _return = true;
-    };
-};
-
-_return
diff --git a/addons/refuel/XEH_postInit.sqf b/addons/refuel/XEH_postInit.sqf
index b2d55e1f7f..92726bb61e 100644
--- a/addons/refuel/XEH_postInit.sqf
+++ b/addons/refuel/XEH_postInit.sqf
@@ -67,11 +67,6 @@ private _sourceClasses = [];
     private _fuelCargo = getNumber (_x >> QGVAR(fuelCargo));
     if (_fuelCargo > 0 || {_fuelCargo == REFUEL_INFINITE_FUEL}) then {
         private _sourceClass = configName _x;
-        if (isClass (_x >> "ACE_Actions" >> "ACE_MainActions" >> QGVAR(Refuel))) exitWith {
-            if (!isClass (inheritsFrom _x >> "ACE_Actions" >> "ACE_MainActions" >> QGVAR(Refuel))) then {
-                ACE_DEPRECATED(FORMAT_1(QUOTE(GVAR(Refuel) interaction menu in %1),_sourceClass),"3.13.0",QUOTE(GVAR(fuelCargo) config value));
-            };
-        };
         // check if we can use actions with inheritance
         if (
             !isText (_x >> "EventHandlers" >> "CBA_Extended_EventHandlers" >> "init") // addActionToClass relies on XEH init
diff --git a/addons/spectator/functions/fnc_updateUnits.sqf b/addons/spectator/functions/fnc_updateUnits.sqf
index 6df7cad8ad..85ad1739ff 100644
--- a/addons/spectator/functions/fnc_updateUnits.sqf
+++ b/addons/spectator/functions/fnc_updateUnits.sqf
@@ -20,16 +20,7 @@
 // Function only matters on player clients
 if (!hasInterface) exitWith {};
 
-params [["_addUnits",[],[[]]], ["_removeUnits",[],[[], true]]];
-
-// Deprecated parameter (remember to remove bool from params when removed)
-if (_removeUnits isEqualType true) then {
-    ACE_DEPRECATED("Boolean parameter","3.12.0","array (see function header or doc)");
-    if (_removeUnits) then {
-        _removeUnits = _addUnits;
-        _addUnits = [];
-    };
-};
+params [["_addUnits",[],[[]]], ["_removeUnits",[],[[]]]];
 
 // Add to the whitelist and prevent list overlap
 GVAR(unitBlacklist) = GVAR(unitBlacklist) - _addUnits;