diff --git a/src/platforms/modrinth/modrinth-version.ts b/src/platforms/modrinth/modrinth-version.ts
new file mode 100644
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+++ b/src/platforms/modrinth/modrinth-version.ts
@@ -0,0 +1,449 @@
+import { VersionType } from "@/utils/versioning";
+import { FileInfo } from "@/utils/io";
+import { ModrinthDependency } from "./modrinth-dependency";
+
+/**
+ * Represents a Modrinth project version.
+ */
+export interface ModrinthVersion {
+    /**
+     * The ID of this version.
+     */
+    id: string;
+
+    /**
+     * The display name of the version.
+     */
+    name: string;
+
+    /**
+     * The project ID associated with this version.
+     */
+    project_id: string;
+
+    /**
+     * The author ID associated with this version.
+     */
+    author_id: string;
+
+    /**
+     * The version number of the project.
+     */
+    version_number: string;
+
+    /**
+     * A textual description of the changes introduced in this version.
+     */
+    changelog: string;
+
+    /**
+     * An array of dependencies for this version, including version ID, project ID,
+     * file name, and the type of dependency (e.g., required, optional).
+     */
+    dependencies: ModrinthDependency[];
+
+    /**
+     * An array of supported game versions for this project version.
+     */
+    game_versions: string[];
+
+    /**
+     * The type of the version (e.g., release, beta, alpha).
+     */
+    version_type: VersionType;
+
+    /**
+     * An array of supported mod loaders for this project version.
+     */
+    loaders: string[];
+
+    /**
+     * Indicates if this version is featured or not.
+     */
+    featured: boolean;
+
+    /**
+     * The status of the version (e.g., listed, unlisted).
+     */
+    status: "listed" | "archived" | "draft" | "unlisted" | "scheduled" | "unknown";
+
+    /**
+     * The requested status of the version (e.g., listed, unlisted).
+     */
+    requested_status: "listed" | "archived" | "draft" | "unlisted";
+
+    /**
+     * The date when this version was published.
+     */
+    date_published: string;
+
+    /**
+     * The number of downloads for this version.
+     */
+    downloads: number;
+
+    /**
+     * The URL of the changelog, if any.
+     */
+    changelog_url?: string;
+
+    /**
+     * An array of files associated with this version.
+     */
+    files: {
+        /**
+         * The file hashes.
+         */
+        hashes: {
+            /**
+             * SHA-512 hash of the file.
+             */
+            sha512: string;
+
+            /**
+             * SHA-1 hash of the file.
+             */
+            sha1: string;
+        };
+
+        /**
+         * The URL of the file.
+         */
+        url: string;
+
+        /**
+         * The file name.
+         */
+        filename: string;
+
+        /**
+         * Indicates if this file is the primary file for this version.
+         */
+        primary: boolean;
+
+        /**
+         * The size of the file in bytes.
+         */
+        size: number;
+
+        /**
+         * The type of the file (e.g., required-resource-pack).
+         */
+        file_type: "required-resource-pack" | "optional-resource-pack";
+    }[];
+}
+
+/**
+ * Options needed to create a new Modrinth Version.
+ */
+export interface ModrinthVersionInit {
+    /**
+     * The name of this version.
+     */
+    name: string;
+
+    /**
+     * The version number. Ideally will follow semantic versioning.
+     */
+    version_number: string;
+
+    /**
+     * The ID of the project this version is for.
+     */
+    project_id: string;
+
+    /**
+     * The changelog for this version.
+     */
+    changelog?: string;
+
+    /**
+     * A list of specific versions of projects that this version depends on.
+     */
+    dependencies?: ModrinthDependency[];
+
+    /**
+     * A list of versions of Minecraft that this version supports.
+     */
+    game_versions?: string[];
+
+    /**
+     * The release channel for this version.
+     *
+     * Defaults to `"release"`.
+     */
+    version_type?: VersionType;
+
+    /**
+     * The mod loaders that this version supports.
+     */
+    loaders?: string[];
+
+    /**
+     * Whether the version is featured or not.
+     *
+     * Defaults to `true`.
+     */
+    featured?: boolean;
+
+    /**
+     * The status of the version.
+     */
+    status?: "listed" | "archived" | "draft" | "unlisted" | "scheduled" | "unknown";
+
+    /**
+     * The requested status of the version.
+     */
+    requested_status?: "listed" | "archived" | "draft" | "unlisted";
+
+    /**
+     * A list of files that should be attached to the version.
+     */
+    files?: (FileInfo | string)[];
+}
+
+/**
+ * The data needed to initialize a Modrinth version.
+ */
+interface ModrinthVersionInitData extends Omit<ModrinthVersionInit, "files"> {
+    /**
+     * The primary file of the version, if any.
+     *
+     * If the version has files, this should be "_0".
+     */
+    primary_file?: "_0";
+
+    /**
+     * An array of strings representing the names of each file part.
+     *
+     * If the version has no files, this should be an empty array.
+     */
+    file_parts: `_${number}`[];
+}
+
+/**
+ * The shape of the object that should be passed to the Modrinth API when creating a new version.
+ */
+type ModrinthVersionInitForm = {
+    /**
+     * The data needed to initialize the Modrinth version.
+     */
+    data: ModrinthVersionInitData;
+} & {
+    /**
+     * An array of strings representing the names of each file part.
+     */
+    [file_part: `_${number}`]: FileInfo;
+};
+
+/**
+ * Options needed to update a Modrinth Version.
+ */
+export interface ModrinthVersionPatch {
+    /**
+     * The ID of this version.
+     */
+    id: string;
+
+    /**
+     * The name of this version.
+     */
+    name?: string;
+
+    /**
+     * The version number. Ideally will follow semantic versioning.
+     */
+    version_number?: string;
+
+    /**
+     * The changelog for this version.
+     */
+    changelog?: string;
+
+    /**
+     * A list of specific versions of projects that this version depends on.
+     */
+    dependencies?: ModrinthDependency[];
+
+    /**
+     * A list of versions of Minecraft that this version supports.
+     */
+    game_versions?: string[];
+
+    /**
+     * The release channel for this version.
+     */
+    version_type?: VersionType;
+
+    /**
+     * The mod loaders that this version supports.
+     */
+    loaders?: string[];
+
+    /**
+     * Whether the version is featured or not.
+     */
+    featured?: boolean;
+
+    /**
+     * The status of this version.
+     */
+    status?: "listed" | "archived" | "draft" | "unlisted" | "scheduled" | "unknown";
+
+    /**
+     * The requested status of this version.
+     */
+    requested_status?: "listed" | "archived" | "draft" | "unlisted";
+
+    /**
+     * The hash format and the hash of the new primary file.
+     */
+    primary_file?: ["sha1" | "sha512", string];
+
+    /**
+     * The types of the files of this version.
+     */
+    file_types?: {
+        /**
+         * The hash algorithm of the hash specified in the hash field.
+         */
+        algorithm: "sha1" | "sha512";
+
+        /**
+         * The hash of the file you're editing.
+         */
+        hash: string;
+
+        /**
+         * The file type of the file you're editing, or null if not provided.
+         */
+        file_type: "required-resource-pack" | "optional-resource-pack" | null;
+    };
+}
+
+/**
+ * Represents a version that may be unfeatured.
+ */
+export interface UnfeaturableModrinthVersion {
+    /**
+     * The ID of this version.
+     */
+    id?: string;
+
+    /**
+     * The project ID associated with this version.
+     */
+    project_id: string;
+
+    /**
+     * A list of versions of Minecraft that this version supports.
+     */
+    game_versions?: string[];
+
+    /**
+     * The release channel for this version.
+     */
+    version_type?: VersionType;
+
+    /**
+     * The mod loaders that this version supports.
+     */
+    loaders?: string[];
+}
+
+/**
+ * Describes a template for searching Modrinth versions based on the specified criteria.
+ */
+export interface ModrinthVersionSearchTemplate {
+    /**
+     * The mod loaders that a version may support.
+     *
+     * @example ["fabric", "forge"]
+     */
+    loaders?: string[];
+
+    /**
+     * A list of versions of Minecraft that a version may support.
+     *
+     * @example ["1.16.5", "1.17.1"]
+     */
+    game_versions?: string[];
+
+    /**
+     * Whether a version should be featured or not.
+     */
+    featured?: boolean;
+}
+
+/**
+ * Describes a template that should be passed to the Modrinth API
+ * for searching Modrinth versions based on the specified criteria.
+ */
+interface ModrinthVersionSearchTemplateForm {
+    /**
+     * A JSON array of mod loaders that a version may support.
+     *
+     * @example '["fabric", "forge"]'
+     */
+    loaders?: string;
+
+    /**
+     * A JSON array of versions of Minecraft that a version may support.
+     *
+     * @example '["1.16.5", "1.17.1"]'
+     */
+    game_versions?: string;
+
+    /**
+     * Whether a version should be featured or not.
+     */
+    featured?: boolean;
+}
+
+/**
+ * Returns the data and file information needed to create a new Modrinth version.
+ *
+ * @param version - The options for the new version.
+ *
+ * @returns An object containing the data and file information for the new version.
+ */
+export function packModrinthVersionInit(version: ModrinthVersionInit): ModrinthVersionInitForm {
+    const { files = [] } = version;
+
+    const data: ModrinthVersionInitData = {
+        // Default values
+        featured: true,
+        dependencies: [],
+        version_type: VersionType.RELEASE,
+
+        // Unpack the `version`
+        ...{ ...version, files: undefined },
+        name: version.name || version.version_number,
+
+        // Names of each file part
+        primary_file: files.length ? "_0" : undefined,
+        file_parts: files.map((_, i) => `_${i}` as const),
+    };
+
+    const form = files.reduce((form, file, i) => {
+        form[`_${i}`] = FileInfo.of(file);
+        return form;
+    }, { data } as ModrinthVersionInitForm);
+
+    return form;
+}
+
+/**
+ * Returns the search template needed to search for a Modrinth version.
+ *
+ * @param version - The search template.
+ *
+ * @returns The search template needed to search for a Modrinth version.
+ */
+export function packModrinthVersionSearchTemplate(template: ModrinthVersionSearchTemplate): ModrinthVersionSearchTemplateForm {
+    const loaders = template?.loaders ? JSON.stringify(template.loaders) : undefined;
+    const game_versions = template?.game_versions ? JSON.stringify(template.game_versions) : undefined;
+    const featured = template?.featured ?? undefined;
+
+    return { loaders, game_versions, featured };
+}