diff --git a/.RELEASE.md b/.RELEASE.md
new file mode 100644
index 0000000..f6ce06d
--- /dev/null
+++ b/.RELEASE.md
@@ -0,0 +1 @@
+- Fix Authentik endpoints ([#244](https://github.com/pilcrowonpaper/arctic/issues/244)).
diff --git a/package.json b/package.json
index 54414ed..e49d98f 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "arctic",
 	"type": "module",
-	"version": "3.1.0",
+	"version": "3.1.1",
 	"description": "OAuth 2.0 clients for popular providers",
 	"main": "dist/index.js",
 	"types": "dist/index.d.ts",
diff --git a/src/providers/authentik.ts b/src/providers/authentik.ts
index 02029bf..d1bc08f 100644
--- a/src/providers/authentik.ts
+++ b/src/providers/authentik.ts
@@ -11,9 +11,9 @@ export class Authentik {
 	private client: OAuth2Client;
 
 	constructor(baseURL: string, clientId: string, clientSecret: string | null, redirectURI: string) {
-		this.authorizationEndpoint = joinURIAndPath(baseURL, "/application/o/authorize");
-		this.tokenEndpoint = joinURIAndPath(baseURL, "/application/o/token");
-		this.tokenRevocationEndpoint = joinURIAndPath(baseURL, "/application/o/revoke");
+		this.authorizationEndpoint = joinURIAndPath(baseURL, "/application/o/authorize/");
+		this.tokenEndpoint = joinURIAndPath(baseURL, "/application/o/token/");
+		this.tokenRevocationEndpoint = joinURIAndPath(baseURL, "/application/o/revoke/");
 		this.client = new OAuth2Client(clientId, clientSecret, redirectURI);
 	}
 
diff --git a/src/request.test.ts b/src/request.test.ts
new file mode 100644
index 0000000..2c7f7ea
--- /dev/null
+++ b/src/request.test.ts
@@ -0,0 +1,21 @@
+import * as vitest from "vitest";
+
+import { joinURIAndPath } from "./request.js";
+
+vitest.test("joinBaseURIAndPath()", () => {
+	vitest.expect(joinURIAndPath("https://example.com", "/hi")).toBe("https://example.com/hi");
+	vitest.expect(joinURIAndPath("https://example.com/", "/hi")).toBe("https://example.com/hi");
+	vitest.expect(joinURIAndPath("https://example.com/", "hi")).toBe("https://example.com/hi");
+	vitest.expect(joinURIAndPath("https://example.com", "hi")).toBe("https://example.com/hi");
+	vitest.expect(joinURIAndPath("https://example.com", "/hi/")).toBe("https://example.com/hi/");
+
+	vitest
+		.expect(joinURIAndPath("https://example.com", "/hi", "/bye"))
+		.toBe("https://example.com/hi/bye");
+	vitest
+		.expect(joinURIAndPath("https://example.com", "hi", "bye"))
+		.toBe("https://example.com/hi/bye");
+	vitest
+		.expect(joinURIAndPath("https://example.com", "/hi/", "/bye/"))
+		.toBe("https://example.com/hi/bye/");
+});
diff --git a/src/request.ts b/src/request.ts
index 6870bb4..9b82926 100644
--- a/src/request.ts
+++ b/src/request.ts
@@ -5,8 +5,7 @@ import { trimLeft, trimRight } from "./utils.js";
 export function joinURIAndPath(base: string, ...path: string[]): string {
 	let joined = trimRight(base, "/");
 	for (const part of path) {
-		joined += "/";
-		joined += trimRight(trimLeft(part, "/"), "/");
+		joined = trimRight(joined, "/") + "/" + trimLeft(part, "/");
 	}
 	return joined;
 }