diff --git a/utility-swing/src/main/java/com/dua3/utility/swing/StyledDocumentConverter.java b/utility-swing/src/main/java/com/dua3/utility/swing/StyledDocumentConverter.java
index 0529ac8e..b71d502e 100644
--- a/utility-swing/src/main/java/com/dua3/utility/swing/StyledDocumentConverter.java
+++ b/utility-swing/src/main/java/com/dua3/utility/swing/StyledDocumentConverter.java
@@ -91,7 +91,7 @@ public static StyledDocumentConversionOption addStyledAttributes(Map<Object, Obj
      * @param attributes attributes for new StyledDocuments
      * @return the option to use
      */
-    public static StyledDocumentConversionOption addStyledAttributes(Iterable<Map.Entry<Object, Object>> attributes) {
+    public static StyledDocumentConversionOption addStyledAttributes(Iterable<? extends Map.Entry<Object, Object>> attributes) {
         return new StyledDocumentConversionOption(c -> attributes.forEach(p -> c.defaultStyledAttributes.addAttribute(p.getKey(), p.getValue())));
     }
 
diff --git a/utility/src/main/java/com/dua3/utility/lang/LangUtil.java b/utility/src/main/java/com/dua3/utility/lang/LangUtil.java
index a66049f0..d386eda5 100644
--- a/utility/src/main/java/com/dua3/utility/lang/LangUtil.java
+++ b/utility/src/main/java/com/dua3/utility/lang/LangUtil.java
@@ -6,7 +6,6 @@
 package com.dua3.utility.lang;
 
 import com.dua3.cabe.annotations.Nullable;
-import com.dua3.utility.data.Pair;
 import com.dua3.utility.io.IoUtil;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -28,9 +27,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.EnumSet;
-import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Locale;
diff --git a/utility/src/main/java/com/dua3/utility/text/TextUtil.java b/utility/src/main/java/com/dua3/utility/text/TextUtil.java
index 8942691e..c7a31efc 100644
--- a/utility/src/main/java/com/dua3/utility/text/TextUtil.java
+++ b/utility/src/main/java/com/dua3/utility/text/TextUtil.java
@@ -5,7 +5,6 @@
 
 package com.dua3.utility.text;
 
-import com.dua3.utility.data.Pair;
 import com.dua3.utility.lang.LangUtil;
 import com.dua3.utility.math.geometry.Dimension2f;
 import org.apache.logging.log4j.LogManager;
@@ -206,7 +205,7 @@ public static String transform(String template, Map.Entry<String, String>... sub
      * @param substitutions  the key-value pairs used for substitution
      * @return the transformed string with placeholders replaced by corresponding values
      */
-    public static String transform(String template, Iterable<Map.Entry<String, String>> substitutions) {
+    public static String transform(String template, Iterable<? extends Map.Entry<String, String>> substitutions) {
         UnaryOperator<String> env = s -> {
             for (Map .Entry<String, String> r : substitutions) {
                 if (Objects.equals(s, r.getKey())) {