diff --git a/Changelog.md b/Changelog.md
index 1a0b6bd..a088281 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,4 +1,5 @@
 ## 0.0.27
++ Fixed pydantic forward reference errors when constructing `Signature` and `Predictor` instances.
 + Fixed `model_dump` error when making predictions in Google Colab due to outdated `pydantic` dependency.
 
 ## 0.0.26
diff --git a/fxn/types/environment.py b/fxn/types/environment.py
index 38186d6..7737c0b 100644
--- a/fxn/types/environment.py
+++ b/fxn/types/environment.py
@@ -3,7 +3,6 @@
 #   Copyright © 2024 NatML Inc. All Rights Reserved.
 #
 
-from __future__ import annotations
 from pydantic import BaseModel
 
 class EnvironmentVariable (BaseModel):
diff --git a/fxn/types/prediction.py b/fxn/types/prediction.py
index afa36a4..1d500e2 100644
--- a/fxn/types/prediction.py
+++ b/fxn/types/prediction.py
@@ -3,12 +3,22 @@
 #   Copyright © 2024 NatML Inc. All Rights Reserved.
 #
 
-from __future__ import annotations
 from pydantic import BaseModel
 from typing import Any, List, Optional
 
 from .predictor import PredictorType
 
+class PredictionResource (BaseModel):
+    """
+    Prediction resource.
+
+    Members:
+        id (str): Resource identifier.
+        url (str): Resource URL.
+    """
+    id: str
+    url: str
+
 class Prediction (BaseModel):
     """
     Prediction.
@@ -36,15 +46,4 @@ class Prediction (BaseModel):
     logs: Optional[str] = None
     implementation: Optional[str] = None
     resources: Optional[List[PredictionResource]] = None
-    configuration: Optional[str] = None    
-
-class PredictionResource (BaseModel):
-    """
-    Prediction resource.
-
-    Members:
-        id (str): Resource identifier.
-        url (str): Resource URL.
-    """
-    id: str
-    url: str
\ No newline at end of file
+    configuration: Optional[str] = None
\ No newline at end of file
diff --git a/fxn/types/predictor.py b/fxn/types/predictor.py
index 9183f5c..7848393 100644
--- a/fxn/types/predictor.py
+++ b/fxn/types/predictor.py
@@ -3,7 +3,6 @@
 #   Copyright © 2024 NatML Inc. All Rights Reserved.
 #
 
-from __future__ import annotations
 from enum import Enum
 from pydantic import BaseModel, Field
 from typing import List, Optional, Tuple, Union
@@ -12,49 +11,48 @@
 from .profile import Profile
 from .value import Value
 
-class Predictor (BaseModel):
+class Acceleration (str, Enum):
     """
-    Predictor.
+    Predictor acceleration.
+    """
+    CPU = "CPU"
+    A40 = "A40"
+    A100 = "A100"
 
-    Members:
-        tag (str): Predictor tag.
-        owner (Profile): Predictor owner.
-        name (str): Predictor name.
-        type (PredictorType): Predictor type.
-        status (PredictorStatus): Predictor status.
-        access (AccessMode): Predictor access.
-        created (str): Date created.
-        description (str): Predictor description.
-        card (str): Predictor card.
-        media (str): Predictor media URL.
-        acceleration (Acceleration): Predictor acceleration. This only applies to cloud predictors.
-        signature (Signature): Predictor signature. This is only populated once predictor has been successfully provisioned.
-        license (str): Predictor license URL.
+class AccessMode (str, Enum):
     """
-    tag: str
-    owner: Profile
-    name: str
-    type: PredictorType
-    status: PredictorStatus
-    access: AccessMode
-    created: str
-    description: Optional[str] = None
-    card: Optional[str] = None
-    media: Optional[str] = None
-    acceleration: Optional[Acceleration] = None
-    signature: Optional[Signature] = None
-    license: Optional[str] = None   
+    Predictor access mode.
+    """
+    Public = "PUBLIC"
+    Private = "PRIVATE"
+    Protected = "PROTECTED"
 
-class Signature (BaseModel):
+class PredictorType (str, Enum):
     """
-    Predictor signature.
+    Predictor type.
+    """
+    Cloud = "CLOUD"
+    Edge = "EDGE"
+
+class PredictorStatus (str, Enum):
+    """
+    Predictor status.
+    """
+    Provisioning = "PROVISIONING"
+    Active = "ACTIVE"
+    Invalid = "INVALID"
+    Archived = "ARCHIVED"
+
+class EnumerationMember (BaseModel):
+    """
+    Prediction parameter enumeration member.
 
     Members:
-        inputs (list): Input parameters.
-        outputs (list): Output parameters.
+        name (str): Enumeration member name.
+        value (str | int): Enumeration member value.
     """
-    inputs: List[Parameter]
-    outputs: List[Parameter]
+    name: str
+    value: Union[str, int]
 
 class Parameter (BaseModel):
     """
@@ -79,45 +77,46 @@ class Parameter (BaseModel):
     default_value: Optional[Value] = None
     value_schema: Optional[dict] = Field(None, alias="schema")
 
-class EnumerationMember (BaseModel):
+class Signature (BaseModel):
     """
-    Prediction parameter enumeration member.
+    Predictor signature.
 
     Members:
-        name (str): Enumeration member name.
-        value (str | int): Enumeration member value.
-    """
-    name: str
-    value: Union[str, int]
-
-class Acceleration (str, Enum):
-    """
-    Predictor acceleration.
-    """
-    CPU = "CPU"
-    A40 = "A40"
-    A100 = "A100"
-
-class AccessMode (str, Enum):
-    """
-    Predictor access mode.
+        inputs (list): Input parameters.
+        outputs (list): Output parameters.
     """
-    Public = "PUBLIC"
-    Private = "PRIVATE"
-    Protected = "PROTECTED"
+    inputs: List[Parameter]
+    outputs: List[Parameter]
 
-class PredictorType (str, Enum):
-    """
-    Predictor type.
+class Predictor (BaseModel):
     """
-    Cloud = "CLOUD"
-    Edge = "EDGE"
+    Predictor.
 
-class PredictorStatus (str, Enum):
-    """
-    Predictor status.
+    Members:
+        tag (str): Predictor tag.
+        owner (Profile): Predictor owner.
+        name (str): Predictor name.
+        type (PredictorType): Predictor type.
+        status (PredictorStatus): Predictor status.
+        access (AccessMode): Predictor access.
+        created (str): Date created.
+        description (str): Predictor description.
+        card (str): Predictor card.
+        media (str): Predictor media URL.
+        acceleration (Acceleration): Predictor acceleration. This only applies to cloud predictors.
+        signature (Signature): Predictor signature. This is only populated once predictor has been successfully provisioned.
+        license (str): Predictor license URL.
     """
-    Provisioning = "PROVISIONING"
-    Active = "ACTIVE"
-    Invalid = "INVALID"
-    Archived = "ARCHIVED"
\ No newline at end of file
+    tag: str
+    owner: Profile
+    name: str
+    type: PredictorType
+    status: PredictorStatus
+    access: AccessMode
+    created: str
+    description: Optional[str] = None
+    card: Optional[str] = None
+    media: Optional[str] = None
+    acceleration: Optional[Acceleration] = None
+    signature: Optional[Signature] = None
+    license: Optional[str] = None
\ No newline at end of file
diff --git a/fxn/types/value.py b/fxn/types/value.py
index 9725413..df7258f 100644
--- a/fxn/types/value.py
+++ b/fxn/types/value.py
@@ -3,7 +3,6 @@
 #   Copyright © 2024 NatML Inc. All Rights Reserved.
 #
 
-from __future__ import annotations
 from pydantic import BaseModel
 from typing import List, Optional, Union