diff --git a/src/main/java/galena/copperative/config/CommonConfig.java b/src/main/java/galena/copperative/config/CommonConfig.java
index fe4d648..1e60dc5 100644
--- a/src/main/java/galena/copperative/config/CommonConfig.java
+++ b/src/main/java/galena/copperative/config/CommonConfig.java
@@ -17,6 +17,7 @@
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.function.BooleanSupplier;
 import java.util.function.Predicate;
@@ -131,7 +132,7 @@ public CommonConfig(ConfigBuilder builder) {
             var property = builder.define("enabled", true);
             var targets = ImmutableMap.<OverrideTarget, BooleanSupplier>builder();
             for (OverrideTarget target : OverrideTarget.values()) {
-                var targetProperty = builder.define(target.name().toLowerCase(), true);
+                var targetProperty = builder.define(target.name().toLowerCase(Locale.ROOT), true);
                 targets.put(target, targetProperty::get);
             }
 
diff --git a/src/main/java/galena/copperative/config/OverwriteEnabledCondition.java b/src/main/java/galena/copperative/config/OverwriteEnabledCondition.java
index 85ccc59..38869d9 100644
--- a/src/main/java/galena/copperative/config/OverwriteEnabledCondition.java
+++ b/src/main/java/galena/copperative/config/OverwriteEnabledCondition.java
@@ -11,6 +11,7 @@
 import net.minecraftforge.registries.ForgeRegistries;
 
 import javax.annotation.Nullable;
+import java.util.Locale;
 import java.util.Objects;
 
 public class OverwriteEnabledCondition implements ICondition {
@@ -47,7 +48,7 @@ public static class Serializer implements IConditionSerializer<OverwriteEnabledC
         @Override
         public void write(JsonObject json, OverwriteEnabledCondition value) {
             json.addProperty("block", value.key.toString());
-            if (value.target != null) json.addProperty("target", value.target.name().toLowerCase());
+            if (value.target != null) json.addProperty("target", value.target.name().toLowerCase(Locale.ROOT));
         }
 
         @Override
diff --git a/src/main/java/galena/copperative/data/CLang.java b/src/main/java/galena/copperative/data/CLang.java
index e6daa06..1abafbc 100644
--- a/src/main/java/galena/copperative/data/CLang.java
+++ b/src/main/java/galena/copperative/data/CLang.java
@@ -9,6 +9,7 @@
 import net.minecraftforge.registries.RegistryObject;
 
 import java.util.List;
+import java.util.Locale;
 
 public class CLang extends CLangProvider {
 
@@ -20,7 +21,7 @@ public void withWeatheredPrefix(List<RegistryObject<Block>> blocks, String base)
         blocks.forEach(block -> {
             if(block.get() instanceof WeatheringCopper copper && copper.getAge() != WeatheringCopper.WeatherState.UNAFFECTED) {
                 var name = copper.getAge().name();
-                var prefix = name.substring(0, 1).toUpperCase() + name.substring(1).toLowerCase();
+                var prefix = name.substring(0, 1).toUpperCase() + name.substring(1).toLowerCase(Locale.ROOT);
                 addBlock(block, prefix + " " + base);
             } else {
                 addBlock(block, base);
diff --git a/src/main/java/galena/copperative/data/provider/CItemModelProvider.java b/src/main/java/galena/copperative/data/provider/CItemModelProvider.java
index 279899b..dc98b09 100644
--- a/src/main/java/galena/copperative/data/provider/CItemModelProvider.java
+++ b/src/main/java/galena/copperative/data/provider/CItemModelProvider.java
@@ -15,6 +15,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 import java.util.function.Supplier;
 
 public abstract class CItemModelProvider extends ItemModelProvider {
@@ -151,7 +152,7 @@ public ItemModelBuilder cogBlock(Block block) {
     public String weatherPrefix(Block block) {
         if (block instanceof WeatheringCopper it) {
             var age = it.getAge();
-            if (age != WeatheringCopper.WeatherState.UNAFFECTED) return age.name().toLowerCase() + "_";
+            if (age != WeatheringCopper.WeatherState.UNAFFECTED) return age.name().toLowerCase(Locale.ROOT) + "_";
         }
         return "";
     }
diff --git a/src/main/java/galena/copperative/index/CBlocks.java b/src/main/java/galena/copperative/index/CBlocks.java
index d146526..eae2bc7 100644
--- a/src/main/java/galena/copperative/index/CBlocks.java
+++ b/src/main/java/galena/copperative/index/CBlocks.java
@@ -147,7 +147,7 @@ public static <B extends Block> RegistryObject<B> register(String name, Supplier
 
     public static <B extends Block> CopperSet<B> registerConvertedSet(String name, Supplier<B> targetSupplier, Function<WeatherState, B> function, CreativeModeTab tab) {
         var weathered = Stream.of(WeatherState.EXPOSED, WeatherState.WEATHERED, WeatherState.OXIDIZED).<Supplier<B>>map(weatherState -> {
-            String prefix = weatherState.name().toLowerCase() + "_";
+            String prefix = weatherState.name().toLowerCase(Locale.ROOT) + "_";
             return register(prefix + name, () -> function.apply(weatherState), tab);
         }).toList();
         return new CopperSet<>(targetSupplier, weathered);
@@ -162,7 +162,7 @@ public static <B extends Block> List<RegistryObject<B>> registerWeatheringSet(Un
         WeatherState[] wStates = WeatherState.values();
         ArrayList<RegistryObject<B>> blocks = new ArrayList<>(4);
         for (final WeatherState weatherState : wStates) {
-            String prefix = weatherState.equals(WeatherState.UNAFFECTED) ? "" : weatherState.name().toLowerCase() + "_";
+            String prefix = weatherState.equals(WeatherState.UNAFFECTED) ? "" : weatherState.name().toLowerCase(Locale.ROOT) + "_";
             Supplier<? extends B> supplier = () -> function.apply(weatherState);
             blocks.add(register(name.apply(prefix), supplier, tab));
         }