diff --git a/tests/unit_node/timers_test.ts b/tests/unit_node/timers_test.ts
index ddc6dc0d85..10c42e892c 100644
--- a/tests/unit_node/timers_test.ts
+++ b/tests/unit_node/timers_test.ts
@@ -118,7 +118,7 @@ Deno.test({
       expectedValue: 42,
       intervalMs: 100,
       iterations: 3,
-      tolerancePercent: 50,
+      tolerancePercent: Deno.env.get("CI") != null ? 75 : 50,
     };
 
     const { setInterval } = timersPromises;
@@ -200,6 +200,7 @@ Deno.test({
     const INTERVAL_MS = 500;
     const TOTAL_DURATION_MS = 3000;
     const TOLERANCE_MS = 500;
+    const DELTA_TOLERANCE_MS = Deno.env.get("CI") != null ? 100 : 50;
 
     const abortController = new AbortController();
     const { setInterval } = timersPromises;
@@ -247,14 +248,14 @@ Deno.test({
     );
 
     intervalDeltas.forEach((delta, i) => {
-      const isIntervalValid = delta >= (INTERVAL_MS - 50) &&
-        delta <= (INTERVAL_MS + 50);
+      const isIntervalValid = delta >= (INTERVAL_MS - DELTA_TOLERANCE_MS) &&
+        delta <= (INTERVAL_MS + DELTA_TOLERANCE_MS);
       assertEquals(
         isIntervalValid,
         true,
         `Interval ${
           i + 1
-        } duration (${delta}ms) should be within ±50ms of ${INTERVAL_MS}ms`,
+        } duration (${delta}ms) should be within ±${DELTA_TOLERANCE_MS}ms of ${INTERVAL_MS}ms`,
       );
     });
   },