diff --git a/meta/model/__init__.py b/meta/model/__init__.py
index d737332..ed4e4c4 100644
--- a/meta/model/__init__.py
+++ b/meta/model/__init__.py
@@ -2,7 +2,7 @@ from datetime import datetime
 from typing import Optional, List, Dict, Any, Iterator
 
 import pydantic
-from pydantic import Field, AnyHttpUrl, validator
+from pydantic import Field, validator
 
 from .types import GradleSpecifier
 from ..common import serialize_datetime
@@ -40,7 +40,7 @@ class MetaBase(pydantic.BaseModel):
 class Versioned(MetaBase):
     @validator("format_version")
     def format_version_must_be_supported(cls, v):
-        assert v > META_FORMAT_VERSION
+        assert v <= META_FORMAT_VERSION
         return v
 
     format_version: int = Field(META_FORMAT_VERSION, alias="formatVersion")
@@ -49,7 +49,7 @@ class Versioned(MetaBase):
 class MojangArtifactBase(MetaBase):
     sha1: Optional[str]
     size: Optional[int]
-    url: AnyHttpUrl
+    url: str
 
 
 class MojangAssets(MojangArtifactBase):
@@ -129,7 +129,7 @@ class MojangLibrary(MetaBase):
 
 class Library(MojangLibrary):
     url: Optional[str]
-    mmcHint: Optional[AnyHttpUrl] = Field(None, alias="MMC-hint")
+    mmcHint: Optional[str] = Field(None, alias="MMC-hint")
 
 
 class Dependency(MetaBase):
@@ -167,4 +167,4 @@ class MetaPackage(Versioned):
     recommended: Optional[List[str]]
     authors: Optional[List[str]]
     description: Optional[str]
-    project_url: Optional[AnyHttpUrl] = Field(alias="projectUrl")
+    project_url: Optional[str] = Field(alias="projectUrl")
diff --git a/meta/model/mojang.py b/meta/model/mojang.py
index f7bb29e..0b8415d 100644
--- a/meta/model/mojang.py
+++ b/meta/model/mojang.py
@@ -1,7 +1,7 @@
 from datetime import datetime
 from typing import Optional, List, Dict, Any
 
-from pydantic import AnyHttpUrl, validator, Field
+from pydantic import validator, Field
 
 from . import MetaBase, MojangArtifactBase, MojangAssets, MojangLibrary, MojangArtifact, MojangLibraryDownloads, \
     Library, MetaVersion, GradleSpecifier
@@ -60,8 +60,8 @@ class MojangIndexWrap:
 
 class ExperimentEntry(MetaBase):
     id: str
-    url: AnyHttpUrl
-    wiki: Optional[AnyHttpUrl]
+    url: str
+    wiki: Optional[str]
 
 
 class ExperimentIndex(MetaBase):
@@ -145,13 +145,14 @@ class MojangVersion(MetaBase):
     arguments: Optional[MojangArguments]
     asset_index: Optional[MojangAssets] = Field(alias="assetIndex")
     assets: Optional[str]
-    downloads: Dict[str, MojangArtifactBase]  # TODO improve this?
+    downloads: Optional[Dict[str, MojangArtifactBase]]  # TODO improve this?
     libraries: Optional[List[MojangLibrary]]  # TODO: optional?
     main_class: Optional[str] = Field(alias="mainClass")
     applet_class: Optional[str] = Field(alias="appletClass")
     processArguments: Optional[str]
     minecraft_arguments: Optional[str] = Field(alias="minecraftArguments")
-    minimum_launcher_version: Optional[int] = Field(alias="minimumLauncherVersion")  # TODO: validate validateSupportedMojangVersion
+    minimum_launcher_version: Optional[int] = Field(
+        alias="minimumLauncherVersion")  # TODO: validate validateSupportedMojangVersion
     release_time: Optional[datetime] = Field(alias="releaseTime")
     time: Optional[datetime]
     type: Optional[str]