diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
index 3383c71..fc53db3 100644
--- a/.github/workflows/dart.yml
+++ b/.github/workflows/dart.yml
@@ -39,4 +39,4 @@ jobs:
       # package:test for this step to succeed. Note that Flutter projects will
       # want to change this to 'flutter test'.
       - name: Run tests
-        run: dart test
+        run: dart test --exclude-tags real-data
diff --git a/test/day1_test.dart b/test/day1_test.dart
index ef7c7da..1740d66 100644
--- a/test/day1_test.dart
+++ b/test/day1_test.dart
@@ -4,7 +4,7 @@ import 'package:aoc_2024/day1/part_2.dart' as part2;
 import 'package:test/test.dart';
 
 void main() {
-  group('sample data', () {
+  group('sample data', tags: 'sample-data', () {
     final resources = Resources.sample;
 
     test('part1', () async {
@@ -16,7 +16,7 @@ void main() {
     });
   });
 
-  group('real data', () {
+  group('real data', tags: 'real-data', () {
     final resources = Resources.real;
 
     test('part1', () async {
diff --git a/test/day2_test.dart b/test/day2_test.dart
index 07681c4..a2548f1 100644
--- a/test/day2_test.dart
+++ b/test/day2_test.dart
@@ -4,7 +4,7 @@ import 'package:aoc_2024/day2/part_2.dart' as part2;
 import 'package:test/test.dart';
 
 void main() {
-  group('sample data', () {
+  group('sample data', tags: 'sample-data', () {
     final resources = Resources.sample;
 
     test('part1', () async {
@@ -16,7 +16,7 @@ void main() {
     });
   });
 
-  group('real data', () {
+  group('real data', tags: 'real-data', () {
     final resources = Resources.real;
 
     test('part1', () async {
diff --git a/test/day3_test.dart b/test/day3_test.dart
index a7edd3f..2e8332f 100644
--- a/test/day3_test.dart
+++ b/test/day3_test.dart
@@ -4,7 +4,7 @@ import 'package:aoc_2024/day3/part_2.dart' as part2;
 import 'package:test/test.dart';
 
 void main() {
-  group('sample data', () {
+  group('sample data', tags: 'sample-data', () {
     final resources = Resources.sample;
 
     test('part1', () async {
@@ -16,7 +16,7 @@ void main() {
     });
   });
 
-  group('real data', () {
+  group('real data', tags: 'real-data', () {
     final resources = Resources.real;
 
     test('part1', () async {
diff --git a/test/day4_test.dart b/test/day4_test.dart
index ec17bd8..553bc6c 100644
--- a/test/day4_test.dart
+++ b/test/day4_test.dart
@@ -4,7 +4,7 @@ import 'package:aoc_2024/day4/part_2.dart' as part2;
 import 'package:test/test.dart';
 
 void main() {
-  group('sample data', () {
+  group('sample data', tags: 'sample-data', () {
     final resources = Resources.sample;
 
     test('part1', () async {
@@ -16,7 +16,7 @@ void main() {
     });
   });
 
-  group('real data', () {
+  group('real data', tags: 'real-data', () {
     final resources = Resources.real;
 
     test('part1', () async {
diff --git a/test/day5_test.dart b/test/day5_test.dart
index 15c2c50..a0417cb 100644
--- a/test/day5_test.dart
+++ b/test/day5_test.dart
@@ -4,7 +4,7 @@ import 'package:aoc_2024/day5/part_2.dart' as part2;
 import 'package:test/test.dart';
 
 void main() {
-  group('sample data', () {
+  group('sample data', tags: 'sample-data', () {
     final resources = Resources.sample;
 
     test('part1', () async {
@@ -16,7 +16,7 @@ void main() {
     });
   });
 
-  group('real data', () {
+  group('real data', tags: 'real-data', () {
     final resources = Resources.real;
 
     test('part1', () async {
diff --git a/test/day6_test.dart b/test/day6_test.dart
index 63ba6e7..4eb9510 100644
--- a/test/day6_test.dart
+++ b/test/day6_test.dart
@@ -4,7 +4,7 @@ import 'package:aoc_2024/day6/part_2.dart' as part2;
 import 'package:test/test.dart';
 
 void main() {
-  group('sample data', () {
+  group('sample data', tags: 'sample-data', () {
     final resources = Resources.sample;
 
     test('part1', () async {
@@ -16,7 +16,7 @@ void main() {
     });
   });
 
-  group('real data', () {
+  group('real data', tags: 'real-data', () {
     final resources = Resources.real;
 
     test('part1', () async {