diff --git a/.changelog/39648.txt b/.changelog/39648.txt
new file mode 100644
index 00000000000..c6080b4c458
--- /dev/null
+++ b/.changelog/39648.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/aws_cloudwatch_event_rule: Add tags to AWS API request on Update to support [ABAC `aws:RequestTag` conditions](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_tags.html#access_tags_control-requests)
+```
\ No newline at end of file
diff --git a/internal/service/events/rule.go b/internal/service/events/rule.go
index 741d78e2866..0fe22b8cf1b 100644
--- a/internal/service/events/rule.go
+++ b/internal/service/events/rule.go
@@ -258,9 +258,17 @@ func resourceRuleUpdate(ctx context.Context, d *schema.ResourceData, meta interf
 		}
 
 		input := expandPutRuleInput(d, ruleName)
+		input.Tags = getTagsIn(ctx) // For ABAC aws:RequestTag condition.
 
 		_, err = retryPutRule(ctx, conn, input)
 
+		// Some partitions (e.g. ISO) may not support tag-on-update.
+		if input.Tags != nil && errs.IsUnsupportedOperationInPartitionError(meta.(*conns.AWSClient).Partition, err) {
+			input.Tags = nil
+
+			_, err = retryPutRule(ctx, conn, input)
+		}
+
 		if err != nil {
 			return sdkdiag.AppendErrorf(diags, "updating EventBridge Rule (%s): %s", d.Id(), err)
 		}