diff --git a/src/core/Ros.ts b/src/core/Ros.ts
index 4a43437fe..0b75188e1 100644
--- a/src/core/Ros.ts
+++ b/src/core/Ros.ts
@@ -33,6 +33,10 @@ import type {
 } from "./transport/Transport.js";
 import { WebSocketTransportFactory } from "./transport/WebSocketTransportFactory.ts";
 
+interface TypeDefDict {
+  [key: string]: string | string[] | TypeDefDict | TypeDefDict[];
+}
+
 /**
  * Manages connection to the rosbridge server and all interactions with ROS.
  *
@@ -641,7 +645,7 @@ export default class Ros extends EventEmitter<
       hints: rosapi.TypeDef[],
     ) => {
       // calls itself recursively to resolve type definition using hints.
-      const typeDefDict = {};
+      const typeDefDict: TypeDefDict = {};
       for (let i = 0; i < theType.fieldnames.length; i++) {
         const arrayLen = theType.fieldarraylen[i];
         const fieldName = theType.fieldnames[i];
diff --git a/tsconfig.json b/tsconfig.json
index 06d1bd156..1c9b1ff67 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -30,30 +30,20 @@
     "isolatedModules": true /* Ensure that each file can be safely transpiled without relying on other imports. */,
 
     /* Strict Type-Checking Options */
-    /* Gradually enable more of these until we can enable strict mode. */
-    "strict": false /* Enable all strict type-checking options. */,
+    "strict": true /* Enable all strict type-checking options. */,
     /* Rules enabled so far */
     "allowUnreachableCode": false /* Disable error reporting for unreachable code. */,
     "allowUnusedLabels": false /* Disable error reporting for unused labels. */,
-    "alwaysStrict": true /* Ensure 'use strict' is always emitted. */,
     "noFallthroughCasesInSwitch": true /* Enable error reporting for fallthrough cases in switch statements */,
-    "strictNullChecks": true /* When type checking, take into account `null` and `undefined`. */,
     "noImplicitReturns": true /* Enable error reporting for codepaths that do not explicitly return in a function. */,
-    "noImplicitThis": true /* Enable error reporting when `this` is given the type `any`. */,
     "noPropertyAccessFromIndexSignature": true /* Enforces using indexed accessors for keys declared using an indexed type */,
     "noUnusedLocals": true /* Enable error reporting when a local variable isn't read. */,
     "noUnusedParameters": true /* Raise an error when a function parameter isn't read */,
-    "strictBindCallApply": true /* Check that the arguments for `bind`, `call`, and `apply` methods match the original function. */,
-    "strictBuiltinIteratorReturn": true /* Built-in iterators are instantiated with a 'TReturn' type of 'undefined' instead of 'any'. */,
-    "useUnknownInCatchVariables": true /* Default catch clause variables as `unknown` instead of `any`. */,
-    "strictFunctionTypes": true /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */,
-    "strictPropertyInitialization": true /* Check for class properties that are declared but not set in the constructor. */,
     "noImplicitOverride": true /* Ensure overriding members in derived classes are marked with an override modifier. */,
     "noUncheckedIndexedAccess": true /* Add `undefined` to a type when accessed using an index. */,
 
     /* Rules to be enabled */
     "exactOptionalPropertyTypes": false /* Differentiate between undefined and not present when type checking */,
-    "noImplicitAny": false /* Enable error reporting for expressions and declarations with an implied 'any' type. */,
 
     "types": ["@types/node"]
   },