diff --git a/requirements.txt b/requirements.txt
index 3cf935e8..cb722af2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-pytest>=8.0.0
+pytest>=8.0.0,<9.1
 requests>=2.31.0
 responses>=0.24.1
 pydantic>=2.9.2
diff --git a/voice/CHANGES.md b/voice/CHANGES.md
index aae0ebd1..9ebe2c4a 100644
--- a/voice/CHANGES.md
+++ b/voice/CHANGES.md
@@ -1,3 +1,6 @@
+# 1.5.1
+- Updating the Voice API `Phone` model
+
 # 1.5.0
 - Add answer wehhook
 - Implement `Wait` NCCO action
diff --git a/voice/src/vonage_voice/_version.py b/voice/src/vonage_voice/_version.py
index 77f1c8e6..51ed7c48 100644
--- a/voice/src/vonage_voice/_version.py
+++ b/voice/src/vonage_voice/_version.py
@@ -1 +1 @@
-__version__ = '1.5.0'
+__version__ = '1.5.1'
diff --git a/voice/src/vonage_voice/models/common.py b/voice/src/vonage_voice/models/common.py
index 99476fec..f68338c7 100644
--- a/voice/src/vonage_voice/models/common.py
+++ b/voice/src/vonage_voice/models/common.py
@@ -1,7 +1,7 @@
 from typing import Literal, Optional
 
 from pydantic import BaseModel, Field
-from vonage_utils.types import PhoneNumber, SipUri
+from vonage_utils.types import SipUri
 from vonage_voice.models.enums import Channel
 
 
@@ -9,10 +9,10 @@ class Phone(BaseModel):
     """Model for a phone number.
 
     Args:
-        number (PhoneNumber): The phone number.
+        number (str): The phone number.
     """
 
-    number: PhoneNumber
+    number: str
     type: Channel = Channel.PHONE
 
 
diff --git a/vonage/CHANGES.md b/vonage/CHANGES.md
index 6c1b9c08..09796fb0 100644
--- a/vonage/CHANGES.md
+++ b/vonage/CHANGES.md
@@ -1,3 +1,7 @@
+# 4.8.2
+- Updates the Voice API `Phone` model to fix a type constraint bug
+
+
 # 4.8.1
 - Fixes some Messages API validations
 
diff --git a/vonage/pyproject.toml b/vonage/pyproject.toml
index c4097194..a98a6d82 100644
--- a/vonage/pyproject.toml
+++ b/vonage/pyproject.toml
@@ -22,7 +22,7 @@ dependencies = [
   "vonage-verify>=2.2.0",
   "vonage-verify-legacy>=1.1.0",
   "vonage-video>=1.5.1",
-  "vonage-voice>=1.5.0",
+  "vonage-voice>=1.5.1",
 ]
 classifiers = [
   "Programming Language :: Python",
diff --git a/vonage/src/vonage/_version.py b/vonage/src/vonage/_version.py
index ec5ed27c..29fd62a7 100644
--- a/vonage/src/vonage/_version.py
+++ b/vonage/src/vonage/_version.py
@@ -1 +1 @@
-__version__ = '4.8.1'
+__version__ = '4.8.2'