diff --git a/packages/snaps-cli/src/commands/build/implementation.test.ts b/packages/snaps-cli/src/commands/build/implementation.test.ts
index 5aea7df409..bb619cec71 100644
--- a/packages/snaps-cli/src/commands/build/implementation.test.ts
+++ b/packages/snaps-cli/src/commands/build/implementation.test.ts
@@ -9,6 +9,7 @@ import {
 import normalFs from 'fs';
 import { dirname, resolve } from 'path';
 import type { Configuration } from 'webpack';
+import type webpackModule from 'webpack';
 
 import { getMockConfig } from '../../test-utils';
 import { getCompiler } from '../../webpack';
@@ -36,8 +37,10 @@ jest.mock('../../webpack', () => ({
       .requireActual<typeof webpack>('../../webpack')
       .getCompiler(...args);
 
-    compiler.inputFileSystem = normalFs;
-    compiler.outputFileSystem = normalFs;
+    compiler.inputFileSystem =
+      normalFs as unknown as webpackModule.InputFileSystem;
+    compiler.outputFileSystem =
+      normalFs as unknown as webpackModule.OutputFileSystem;
 
     return compiler;
   }),
@@ -48,11 +51,14 @@ jest.mock('../../webpack/utils', () => ({
   getDefaultLoader: jest.fn<
     ReturnType<typeof utils.getDefaultLoader>,
     Parameters<typeof utils.getDefaultLoader>
-  >(async (config) => {
+  >(async (config): ReturnType<typeof utils.getDefaultLoader> => {
     if (config.legacy) {
       return {
         loader: BROWSERIFY_LOADER_PATH,
-        options: config.legacy,
+        options: {
+          ...config.legacy,
+          fn: jest.fn(),
+        },
       };
     }
 
diff --git a/packages/snaps-cli/src/commands/watch/implementation.test.ts b/packages/snaps-cli/src/commands/watch/implementation.test.ts
index 0a879aa786..db4aac4567 100644
--- a/packages/snaps-cli/src/commands/watch/implementation.test.ts
+++ b/packages/snaps-cli/src/commands/watch/implementation.test.ts
@@ -4,6 +4,7 @@ import {
   getSnapManifest,
 } from '@metamask/snaps-utils/test-utils';
 import normalFs from 'fs';
+import type webpackModule from 'webpack';
 
 import { getMockConfig } from '../../test-utils';
 import { getCompiler } from '../../webpack';
@@ -24,8 +25,10 @@ jest.mock('../../webpack', () => ({
       .requireActual<typeof webpack>('../../webpack')
       .getCompiler(...args);
 
-    compiler.inputFileSystem = normalFs;
-    compiler.outputFileSystem = normalFs;
+    compiler.inputFileSystem =
+      normalFs as unknown as webpackModule.InputFileSystem;
+    compiler.outputFileSystem =
+      normalFs as unknown as webpackModule.OutputFileSystem;
 
     return compiler;
   }),
@@ -57,6 +60,7 @@ describe('watch', () => {
     // @ts-expect-error - Partial mock.
     mock.mockImplementationOnce(() => ({
       watch: watchMock,
+      watching: {},
     }));
 
     await watch(
diff --git a/packages/snaps-utils/src/platform-version.ts b/packages/snaps-utils/src/platform-version.ts
index 140c18bea3..680cda9127 100644
--- a/packages/snaps-utils/src/platform-version.ts
+++ b/packages/snaps-utils/src/platform-version.ts
@@ -1,4 +1,5 @@
 import packageJson from '@metamask/snaps-sdk/package.json';
+import type { SemVerVersion } from '@metamask/utils';
 
 /**
  * Get the current supported platform version.
@@ -9,6 +10,6 @@ import packageJson from '@metamask/snaps-sdk/package.json';
  *
  * @returns The platform version.
  */
-export function getPlatformVersion() {
-  return packageJson.version;
+export function getPlatformVersion(): SemVerVersion {
+  return packageJson.version as SemVerVersion;
 }