diff --git a/stix2/test/v20/test_attack_pattern.py b/stix2/test/v20/test_attack_pattern.py
index caeb46e..8d35e52 100644
--- a/stix2/test/v20/test_attack_pattern.py
+++ b/stix2/test/v20/test_attack_pattern.py
@@ -83,7 +83,7 @@ def test_attack_pattern_invalid_labels():
 
 
 def test_overly_precise_timestamps():
-    ap = stix2.v21.AttackPattern(
+    ap = stix2.v20.AttackPattern(
         id=ATTACK_PATTERN_ID,
         created="2016-05-12T08:17:27.0000342Z",
         modified="2016-05-12T08:17:27.000287Z",
@@ -99,7 +99,7 @@ def test_overly_precise_timestamps():
 
 
 def test_less_precise_timestamps():
-    ap = stix2.v21.AttackPattern(
+    ap = stix2.v20.AttackPattern(
         id=ATTACK_PATTERN_ID,
         created="2016-05-12T08:17:27.00Z",
         modified="2016-05-12T08:17:27.0Z",