diff --git a/packages/deno/package.json b/packages/deno/package.json
index b1e3996e8dfd..99dcec12e7c6 100644
--- a/packages/deno/package.json
+++ b/packages/deno/package.json
@@ -49,7 +49,8 @@
     "lint:fix": "oxlint . --fix --type-aware",
     "lint:es-compatibility": "es-check es2022 ./build/esm/*.js --module",
     "install:deno": "node ./scripts/install-deno.mjs",
-    "test": "run-s install:deno deno-types test:unit",
+    "test": "run-s install:deno deno-types test:types test:unit",
+    "test:types": "deno check --unstable-sloppy-imports test",
     "test:unit": "deno test --allow-net --allow-read --allow-run --allow-env --no-check",
     "test:unit:update": "deno test --allow-net --allow-read --allow-run --allow-env --no-check --allow-write -- --update",
     "yalc:publish": "yalc publish --push --sig"
diff --git a/packages/deno/test/deno-runtime-metrics.test.ts b/packages/deno/test/deno-runtime-metrics.test.ts
index 0dfdc5d35d6a..947cc1777e0f 100644
--- a/packages/deno/test/deno-runtime-metrics.test.ts
+++ b/packages/deno/test/deno-runtime-metrics.test.ts
@@ -45,7 +45,7 @@ async function collectMetrics(
   await client.flush(2000);
 
   // Stop the collection interval so Deno's leak detector doesn't flag it.
-  metricsIntegration.teardown?.();
+  (metricsIntegration as { teardown?: () => void }).teardown?.();
 
   const items: MetricItem[] = [];
   for (const envelope of envelopes) {
diff --git a/packages/deno/test/opentelemetry.test.ts b/packages/deno/test/opentelemetry.test.ts
index 12349ea6a78a..c8847ad3c468 100644
--- a/packages/deno/test/opentelemetry.test.ts
+++ b/packages/deno/test/opentelemetry.test.ts
@@ -1,5 +1,6 @@
 import { getMainCarrier } from '@sentry/core';
 import { assertEquals, assertNotEquals } from 'https://deno.land/std@0.212.0/assert/mod.ts';
+import type { TracerProvider } from 'npm:@opentelemetry/api@1';
 import { context, propagation, trace } from 'npm:@opentelemetry/api@1';
 import type { DenoClient } from '../build/esm/index.js';
 import { init, startSpan } from '../build/esm/index.js';
@@ -149,8 +150,8 @@ Deno.test('should override pre-existing OTel provider with Sentry provider', asy
   resetSdk();
 
   // Simulate a pre-existing OTel registration (e.g. from Supabase Edge Runtime)
-  const fakeProvider = { getTracer: () => ({}) };
-  trace.setGlobalTracerProvider(fakeProvider as any);
+  const fakeProvider = { getTracer: () => ({}) } as unknown as TracerProvider;
+  trace.setGlobalTracerProvider(fakeProvider);
 
   const transactionEvents: any[] = [];
 
diff --git a/packages/deno/test/sdk.test.ts b/packages/deno/test/sdk.test.ts
index fe85e2ff9f45..032442ece005 100644
--- a/packages/deno/test/sdk.test.ts
+++ b/packages/deno/test/sdk.test.ts
@@ -6,10 +6,11 @@ import {
   init as initSdk,
   spanStreamingIntegration,
 } from '../build/esm/index.js';
+import type { DenoOptions } from '../build/esm/index.js';
 import { assert } from 'https://deno.land/std@0.212.0/assert/assert.ts';
 import { assertEquals } from 'https://deno.land/std@0.212.0/assert/assert_equals.ts';
 
-function init(options) {
+function init(options: DenoOptions) {
   getCurrentScope().setClient(undefined);
   return initSdk(options);
 }
@@ -40,7 +41,7 @@ Deno.test("doesn't add spanStreamingIntegration if user added it manually", () =
   });
   const integrations = client.getOptions().integrations.filter(i => i.name === 'SpanStreaming');
   assertEquals(integrations.length, 1);
-  assert(!integrations[0].isDefaultInstance);
+  assert(!(integrations[0] as { isDefaultInstance?: true }).isDefaultInstance);
 });
 
 Deno.test("doesn't add tracing integrations when tracing is disabled", () => {
@@ -73,7 +74,7 @@ Deno.test('getDefaultIntegrations gates the tracing set on the options it is giv
 });
 
 Deno.test("init doesn't write the computed default integrations back onto the options object", () => {
-  const options = { dsn: 'https://username@domain/123' };
+  const options: DenoOptions = { dsn: 'https://username@domain/123' };
   init(options);
   assertEquals('defaultIntegrations' in options, false);
   options.tracesSampleRate = 1;