diff --git a/src/Date.php b/src/Date.php
index dcfca76..3bea034 100644
--- a/src/Date.php
+++ b/src/Date.php
@@ -4,7 +4,6 @@
 
 namespace DigitalCraftsman\DateTimePrecision;
 
-/** @psalm-immutable */
 final readonly class Date implements \Stringable
 {
     private const DATE_FORMAT = 'Y-m-d';
diff --git a/src/Month.php b/src/Month.php
index 32aa55a..9c3e36a 100644
--- a/src/Month.php
+++ b/src/Month.php
@@ -4,7 +4,6 @@
 
 namespace DigitalCraftsman\DateTimePrecision;
 
-/** @psalm-immutable */
 final readonly class Month implements \Stringable
 {
     private const MONTH_FORMAT = 'Y-m';
diff --git a/src/Time.php b/src/Time.php
index 7d097c8..65f2d69 100644
--- a/src/Time.php
+++ b/src/Time.php
@@ -4,7 +4,6 @@
 
 namespace DigitalCraftsman\DateTimePrecision;
 
-/** @psalm-immutable */
 final readonly class Time implements \Stringable
 {
     private const TIME_FORMAT = 'H:i:s.u';
diff --git a/src/Year.php b/src/Year.php
index 1798e5a..66b2f30 100644
--- a/src/Year.php
+++ b/src/Year.php
@@ -4,7 +4,6 @@
 
 namespace DigitalCraftsman\DateTimePrecision;
 
-/** @psalm-immutable */
 final readonly class Year
 {
     // -- Construction