diff --git a/package.json b/package.json
index 2099c298a..3598bc58e 100644
--- a/package.json
+++ b/package.json
@@ -228,6 +228,7 @@
     "@types/react-table": "^7.7.8",
     "@types/react-virtualized-auto-sizer": "^1.0.1",
     "@types/react-window": "^1.8.5",
+    "@types/semver": "^7.3.9",
     "@types/sequelize": "^4.28.10",
     "@types/slug": "^5.0.2",
     "@types/socket.io": "2.1.13",
diff --git a/server/middlewares/apexRedirect.ts b/server/middlewares/apexRedirect.ts
index 8cbd15843..7d01dc1c6 100644
--- a/server/middlewares/apexRedirect.ts
+++ b/server/middlewares/apexRedirect.ts
@@ -1,10 +1,7 @@
-import { Context } from "koa";
+import { Context, Next } from "koa";
 
 export default function apexRedirect() {
-  return async function apexRedirectMiddleware(
-    ctx: Context,
-    next: () => Promise<any>
-  ) {
+  return async function apexRedirectMiddleware(ctx: Context, next: Next) {
     if (ctx.headers.host === "getoutline.com") {
       ctx.redirect(`https://www.${ctx.headers.host}${ctx.path}`);
     } else {
diff --git a/server/middlewares/authentication.ts b/server/middlewares/authentication.ts
index 99f0fc4d4..ab24dea41 100644
--- a/server/middlewares/authentication.ts
+++ b/server/middlewares/authentication.ts
@@ -1,3 +1,4 @@
+import { Next } from "koa";
 import { User, Team, ApiKey } from "@server/models";
 import { getUserForJWT } from "@server/utils/jwt";
 import { AuthenticationError, UserSuspendedError } from "../errors";
@@ -8,10 +9,7 @@ export default function auth(
     required?: boolean;
   } = {}
 ) {
-  return async function authMiddleware(
-    ctx: ContextWithState,
-    next: () => Promise<unknown>
-  ) {
+  return async function authMiddleware(ctx: ContextWithState, next: Next) {
     let token;
     const authorizationHeader = ctx.request.get("authorization");
 
diff --git a/server/middlewares/errorHandling.ts b/server/middlewares/errorHandling.ts
index b307cbfec..f66f3cf15 100644
--- a/server/middlewares/errorHandling.ts
+++ b/server/middlewares/errorHandling.ts
@@ -1,12 +1,9 @@
-import { Context } from "koa";
+import { Context, Next } from "koa";
 import { snakeCase } from "lodash";
 import Sequelize from "sequelize";
 
 export default function errorHandling() {
-  return async function errorHandlingMiddleware(
-    ctx: Context,
-    next: () => Promise<any>
-  ) {
+  return async function errorHandlingMiddleware(ctx: Context, next: Next) {
     try {
       await next();
     } catch (err) {
diff --git a/server/middlewares/methodOverride.ts b/server/middlewares/methodOverride.ts
index a79d03d61..9e37a2f4a 100644
--- a/server/middlewares/methodOverride.ts
+++ b/server/middlewares/methodOverride.ts
@@ -1,11 +1,8 @@
-import { Context } from "koa";
+import { Context, Next } from "koa";
 import queryString from "query-string";
 
 export default function methodOverride() {
-  return async function methodOverrideMiddleware(
-    ctx: Context,
-    next: () => Promise<any>
-  ) {
+  return async function methodOverrideMiddleware(ctx: Context, next: Next) {
     if (ctx.method === "POST") {
       ctx.body = ctx.request.body;
     } else if (ctx.method === "GET") {
diff --git a/server/routes/api/middlewares/apiWrapper.ts b/server/routes/api/middlewares/apiWrapper.ts
index a21719c80..f2cd564c6 100644
--- a/server/routes/api/middlewares/apiWrapper.ts
+++ b/server/routes/api/middlewares/apiWrapper.ts
@@ -1,11 +1,8 @@
 import stream from "stream";
-import { Context } from "koa";
+import { Context, Next } from "koa";
 
 export default function apiWrapper() {
-  return async function apiWrapperMiddleware(
-    ctx: Context,
-    next: () => Promise<any>
-  ) {
+  return async function apiWrapperMiddleware(ctx: Context, next: Next) {
     await next();
     const ok = ctx.status < 400;
 
diff --git a/server/routes/api/middlewares/editor.ts b/server/routes/api/middlewares/editor.ts
index 1362ebb99..645701bd2 100644
--- a/server/routes/api/middlewares/editor.ts
+++ b/server/routes/api/middlewares/editor.ts
@@ -1,26 +1,24 @@
-import { Context } from "koa";
+import { Context, Next } from "koa";
 import pkg from "rich-markdown-editor/package.json";
-// @ts-expect-error ts-migrate(7016) FIXME: Could not find a declaration file for module 'semv... Remove this comment to see the full error message
 import semver from "semver";
 import { EditorUpdateError } from "@server/errors";
 
 export default function editor() {
-  return async function editorMiddleware(
-    ctx: Context,
-    next: () => Promise<any>
-  ) {
+  return async function editorMiddleware(ctx: Context, next: Next) {
     const clientVersion = ctx.headers["x-editor-version"];
 
     // If the editor version on the client is behind the current version being
     // served in production by either a minor (new features), or major (breaking
     // changes) then force a client reload.
     if (clientVersion) {
-      const parsedClientVersion = semver.parse(clientVersion);
+      const parsedClientVersion = semver.parse(clientVersion as string);
       const parsedCurrentVersion = semver.parse(pkg.version);
 
       if (
-        parsedClientVersion.major < parsedCurrentVersion.major ||
-        parsedClientVersion.minor < parsedCurrentVersion.minor
+        parsedClientVersion &&
+        parsedCurrentVersion &&
+        (parsedClientVersion.major < parsedCurrentVersion.major ||
+          parsedClientVersion.minor < parsedCurrentVersion.minor)
       ) {
         throw EditorUpdateError();
       }
diff --git a/server/routes/api/middlewares/pagination.ts b/server/routes/api/middlewares/pagination.ts
index 3362ec614..201b95d4c 100644
--- a/server/routes/api/middlewares/pagination.ts
+++ b/server/routes/api/middlewares/pagination.ts
@@ -1,12 +1,9 @@
 import querystring from "querystring";
-import { Context } from "koa";
+import { Context, Next } from "koa";
 import { InvalidRequestError } from "@server/errors";
 
 export default function pagination(options?: Record<string, any>) {
-  return async function paginationMiddleware(
-    ctx: Context,
-    next: () => Promise<any>
-  ) {
+  return async function paginationMiddleware(ctx: Context, next: Next) {
     const opts = {
       defaultLimit: 15,
       defaultOffset: 0,
diff --git a/yarn.lock b/yarn.lock
index 3cb047456..c2754c23b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3188,6 +3188,11 @@
   resolved "https://registry.yarnpkg.com/@types/scheduler/-/scheduler-0.16.2.tgz#1a62f89525723dde24ba1b01b092bf5df8ad4d39"
   integrity sha512-hppQEBDmlwhFAXKJX2KnWLYu5yMfi91yazPb2l+lbJiwW+wdo1gNeRA+3RgNSO39WYX2euey41KEwnqesU2Jew==
 
+"@types/semver@^7.3.9":
+  version "7.3.9"
+  resolved "https://registry.yarnpkg.com/@types/semver/-/semver-7.3.9.tgz#152c6c20a7688c30b967ec1841d31ace569863fc"
+  integrity sha512-L/TMpyURfBkf+o/526Zb6kd/tchUP3iBDEPjqjb+U2MAJhVRxxrmr2fwpe08E7QsV7YLcpq0tUaQ9O9x97ZIxQ==
+
 "@types/sequelize@^4.28.10":
   version "4.28.10"
   resolved "https://registry.yarnpkg.com/@types/sequelize/-/sequelize-4.28.10.tgz#514b716718d4f6f398daaff78c05153534f2104e"