diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b2f2bb6..22a6cab6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # @changesets/action
 
+## 1.8.2
+
+### Patch Changes
+
+- [`e47dcdc`](https://github.com/changesets/action/commit/e47dcdcda2d3c570ab43fc31f1ac43872b47a5a4) Thanks [@openscript](https://github.com/openscript)! - Filter clientside for Forgejo
+
+## 1.8.1
+
+### Patch Changes
+
+- [`2135466`](https://github.com/changesets/action/commit/213546601666ba543dd4a716db7b148c55f4c36f) Thanks [@openscript](https://github.com/openscript)! - Encode branch and base
+
 ## 1.8.0
 
 ### Minor Changes
@@ -11,6 +23,7 @@
 - [#502](https://github.com/changesets/action/pull/502) [`6002dbd`](https://github.com/changesets/action/commit/6002dbd987f49a3c0a134910d9c7bca975b79977) Thanks [@oshytiko](https://github.com/oshytiko)! - Fixed initial `.changeset` state being picked up, when `cwd` parameter is provided
 
 - [#536](https://github.com/changesets/action/pull/536) [`81b3f61`](https://github.com/changesets/action/commit/81b3f61ebffcb868f73e4c0b2682517149c834a2) Thanks [@radnan](https://github.com/radnan)! - Fixed `.changeset` state being picked for the version command when `cwd` parameter is provided
+- [`905ea6d`](https://github.com/changesets/action/commit/905ea6d481f54d210f11da2daa15655dadd89f15) Thanks [@openscript](https://github.com/openscript)! - Add Forgejo/Gitea actions support
 
 ## 1.7.0
 
diff --git a/src/run.test.ts b/src/run.test.ts
index ff1b268c..eaf1cb57 100644
--- a/src/run.test.ts
+++ b/src/run.test.ts
@@ -5,7 +5,7 @@ import { createFixture } from "fs-fixture";
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import { Git } from "./git.ts";
 import { setupOctokit } from "./octokit.ts";
-import { runVersion } from "./run.ts";
+import { isForgejoOrGitea, runVersion } from "./run.ts";
 
 vi.mock("@actions/github", () => ({
   context: {
@@ -427,3 +427,23 @@ fluminis divesque vulnere aquis parce lapsis rabie si visa fulmineis.
     expect(mockedGraphql.mock.calls[0]).toMatchSnapshot();
   });
 });
+
+describe("isForgejoOrGitea", () => {
+  it("returns false when no Forgejo/Gitea env vars are set", () => {
+    delete process.env.GITEA_ACTIONS;
+    delete process.env.FORGEJO_ACTIONS;
+    expect(isForgejoOrGitea()).toBe(false);
+  });
+
+  it("returns true when GITEA_ACTIONS is set", () => {
+    process.env.GITEA_ACTIONS = "true";
+    expect(isForgejoOrGitea()).toBe(true);
+    delete process.env.GITEA_ACTIONS;
+  });
+
+  it("returns true when FORGEJO_ACTIONS is set", () => {
+    process.env.FORGEJO_ACTIONS = "true";
+    expect(isForgejoOrGitea()).toBe(true);
+    delete process.env.FORGEJO_ACTIONS;
+  });
+});
diff --git a/src/run.ts b/src/run.ts
index 818edfb6..d33e3ba1 100644
--- a/src/run.ts
+++ b/src/run.ts
@@ -20,6 +20,69 @@ import {
 
 const require = createRequire(import.meta.url);
 
+/**
+ * Detects if we're running on Forgejo or Gitea Actions.
+ * These platforms set specific environment variables when running actions.
+ */
+export function isForgejoOrGitea(): boolean {
+  return !!(process.env.GITEA_ACTIONS || process.env.FORGEJO_ACTIONS);
+}
+
+type PullRequestData = {
+  number: number;
+  title: string;
+  body: string | null;
+  state: string;
+  head?: { ref: string };
+  base?: { ref: string };
+};
+
+/**
+ * Fetches existing pull requests from the version branch to the base branch.
+ * Uses different API endpoints for GitHub vs Forgejo/Gitea.
+ *
+ * GitHub: GET /repos/{owner}/{repo}/pulls?state=open&head={owner}:{branch}&base={base}
+ * Forgejo/Gitea: List all open PRs and filter client-side (their list API doesn't support head/base filters)
+ */
+export async function getExistingPullRequests(
+  octokit: Octokit,
+  options: {
+    owner: string;
+    repo: string;
+    head: string;
+    base: string;
+  }
+): Promise<PullRequestData[]> {
+  if (isForgejoOrGitea()) {
+    core.info("Detected Forgejo/Gitea environment, using compatible API");
+    // Forgejo/Gitea list endpoint doesn't support head/base filters,
+    // so we list all open PRs and filter client-side
+    const response = await octokit.rest.pulls.list({
+      owner: options.owner,
+      repo: options.repo,
+      state: "open",
+    });
+    // Filter by head and base branch
+    const filtered = response.data.filter(
+      (pr) => pr.head.ref === options.head && pr.base.ref === options.base
+    );
+    core.info(
+      `Found ${response.data.length} open PR(s), ${filtered.length} matching head=${options.head} base=${options.base}`
+    );
+    return filtered;
+  } else {
+    // GitHub API: GET /repos/{owner}/{repo}/pulls with query params
+    const response = await octokit.rest.pulls.list({
+      owner: options.owner,
+      repo: options.repo,
+      state: "open",
+      head: `${options.owner}:${options.head}`,
+      base: options.base,
+    });
+    return response.data;
+  }
+}
+
 // GitHub Issues/PRs messages have a max size limit on the
 // message body payload.
 // `body is too long (maximum is 65536 characters)`.
@@ -71,12 +134,12 @@ type PublishedPackage = { name: string; version: string };
 
 type PublishResult =
   | {
-      published: true;
-      publishedPackages: PublishedPackage[];
-    }
+    published: true;
+    publishedPackages: PublishedPackage[];
+  }
   | {
-      published: false;
-    };
+    published: false;
+  };
 
 export async function runPublish({
   script,
@@ -108,7 +171,7 @@ export async function runPublish({
       if (pkg === undefined) {
         throw new Error(
           `Package "${pkgName}" not found.` +
-            "This is probably a bug in the action, please open an issue",
+          "This is probably a bug in the action, please open an issue",
         );
       }
       releasedPackages.push(pkg);
@@ -127,7 +190,7 @@ export async function runPublish({
     if (packages.length === 0) {
       throw new Error(
         `No package found.` +
-          "This is probably a bug in the action, please open an issue",
+        "This is probably a bug in the action, please open an issue",
       );
     }
     let pkg = packages[0];
@@ -199,11 +262,10 @@ export async function getVersionPrBody({
   prBodyMaxCharacters,
   branch,
 }: GetMessageOptions) {
-  let messageHeader = `This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and ${
-    hasPublishScript
-      ? `the packages will be published to npm automatically`
-      : `publish to npm yourself or [setup this action to publish automatically](https://github.com/changesets/action#with-publishing)`
-  }. If you're not ready to do a release yet, that's fine, whenever you add more changesets to ${branch}, this PR will be updated.
+  let messageHeader = `This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and ${hasPublishScript
+    ? `the packages will be published to npm automatically`
+    : `publish to npm yourself or [setup this action to publish automatically](https://github.com/changesets/action#with-publishing)`
+    }. If you're not ready to do a release yet, that's fine, whenever you add more changesets to ${branch}, this PR will be updated.
 `;
   let messagePrestate = !!preState
     ? `⚠️⚠️⚠️⚠️⚠️⚠️
@@ -330,9 +392,8 @@ export async function runVersion({
   );
 
   const finalPrTitle = `${prTitle}${!!preState ? ` (${preState.tag})` : ""}`;
-  const finalCommitMessage = `${commitMessage}${
-    !!preState ? ` (${preState.tag})` : ""
-  }`;
+  const finalCommitMessage = `${commitMessage}${!!preState ? ` (${preState.tag})` : ""
+    }`;
 
   /**
    * Fetch any existing pull requests that are open against the branch,
@@ -341,15 +402,15 @@ export async function runVersion({
    * (`@changesets/ghcommit` has to reset the branch to the same commit as the base,
    * which GitHub will then react to by closing the PRs)
    */
-  const existingPullRequests = await octokit.rest.pulls.list({
-    ...github.context.repo,
-    state: "open",
-    head: `${github.context.repo.owner}:${versionBranch}`,
+  const existingPullRequests = await getExistingPullRequests(octokit, {
+    owner: github.context.repo.owner,
+    repo: github.context.repo.repo,
+    head: versionBranch,
     base: branch,
   });
   core.info(
     `Existing pull requests: ${JSON.stringify(
-      existingPullRequests.data,
+      existingPullRequests,
       null,
       2,
     )}`,
@@ -369,7 +430,7 @@ export async function runVersion({
     prBodyMaxCharacters,
   });
 
-  if (existingPullRequests.data.length === 0) {
+  if (existingPullRequests.length === 0) {
     core.info("creating pull request");
     const { data: newPullRequest } = await octokit.rest.pulls.create({
       base: branch,
@@ -384,7 +445,7 @@ export async function runVersion({
       pullRequestNumber: newPullRequest.number,
     };
   } else {
-    const [pullRequest] = existingPullRequests.data;
+    const [pullRequest] = existingPullRequests;
 
     core.info(`updating found pull request #${pullRequest.number}`);
     const convertPullRequestToDraftMutation =