diff --git a/Mage.Sets/src/mage/cards/c/CreepingRenaissance.java b/Mage.Sets/src/mage/cards/c/CreepingRenaissance.java
index 486f01c731c..ad5f99f767d 100644
--- a/Mage.Sets/src/mage/cards/c/CreepingRenaissance.java
+++ b/Mage.Sets/src/mage/cards/c/CreepingRenaissance.java
@@ -17,6 +17,7 @@ import mage.game.Game;
 import mage.players.Player;
 
 import java.util.Arrays;
+import java.util.Locale;
 import java.util.UUID;
 import java.util.stream.Collectors;
 
@@ -73,7 +74,7 @@ class CreepingRenaissanceEffect extends OneShotEffect {
         if (chosenType == null) {
             return false;
         }
-        FilterCard filter = new FilterCard(chosenType.toString().toLowerCase() + " card");
+        FilterCard filter = new FilterCard(chosenType.toString().toLowerCase(Locale.ENGLISH) + " card");
         filter.add(chosenType.getPredicate());
         return controller.moveCards(controller.getGraveyard().getCards(filter, source.getSourceId(), controller.getId(), game), Zone.HAND, source, game);
     }
diff --git a/Mage/src/main/java/mage/abilities/condition/common/IsPhaseCondition.java b/Mage/src/main/java/mage/abilities/condition/common/IsPhaseCondition.java
index 031fe43f524..95a7c514cbb 100644
--- a/Mage/src/main/java/mage/abilities/condition/common/IsPhaseCondition.java
+++ b/Mage/src/main/java/mage/abilities/condition/common/IsPhaseCondition.java
@@ -7,6 +7,8 @@ import mage.abilities.condition.Condition;
 import mage.constants.TurnPhase;
 import mage.game.Game;
 
+import java.util.Locale;
+
 /**
  * @author LevelX2
  */
@@ -25,7 +27,7 @@ public class IsPhaseCondition implements Condition {
 
     @Override
     public String toString() {
-        return new StringBuilder("during ").append(turnPhase).toString().toLowerCase();
+        return new StringBuilder("during ").append(turnPhase).toString().toLowerCase(Locale.ENGLISH);
     }
 
 }
diff --git a/Mage/src/main/java/mage/abilities/effects/common/ruleModifying/CastOnlyDuringPhaseStepSourceEffect.java b/Mage/src/main/java/mage/abilities/effects/common/ruleModifying/CastOnlyDuringPhaseStepSourceEffect.java
index c1251c837c4..147e1ba9eb7 100644
--- a/Mage/src/main/java/mage/abilities/effects/common/ruleModifying/CastOnlyDuringPhaseStepSourceEffect.java
+++ b/Mage/src/main/java/mage/abilities/effects/common/ruleModifying/CastOnlyDuringPhaseStepSourceEffect.java
@@ -63,7 +63,7 @@ public class CastOnlyDuringPhaseStepSourceEffect extends ContinuousRuleModifying
     private String setText() {
         StringBuilder sb = new StringBuilder("cast this spell only during ");
         if (turnPhase != null) {
-            sb.append(turnPhase.toString().toLowerCase());
+            sb.append(turnPhase.toString().toLowerCase(Locale.ENGLISH));
         }
         if (phaseStep != null) {
             sb.append("the ").append(phaseStep.getStepText());
diff --git a/Mage/src/main/java/mage/cards/repository/CardInfo.java b/Mage/src/main/java/mage/cards/repository/CardInfo.java
index a3154258273..2c60fcd8963 100644
--- a/Mage/src/main/java/mage/cards/repository/CardInfo.java
+++ b/Mage/src/main/java/mage/cards/repository/CardInfo.java
@@ -120,7 +120,7 @@ public class CardInfo {
 
     public CardInfo(Card card) {
         this.name = card.getName();
-        this.lower_name = name.toLowerCase();
+        this.lower_name = name.toLowerCase(Locale.ENGLISH);
         this.cardNumber = card.getCardNumber();
         this.setCode = card.getExpansionSetCode();
         this.className = card.getClass().getCanonicalName();