diff --git a/src/main/java/org/mybatis/dynamic/sql/SqlBuilder.java b/src/main/java/org/mybatis/dynamic/sql/SqlBuilder.java
index 53851e2af..4ed0de186 100644
--- a/src/main/java/org/mybatis/dynamic/sql/SqlBuilder.java
+++ b/src/main/java/org/mybatis/dynamic/sql/SqlBuilder.java
@@ -217,7 +217,7 @@ static FromGatherer<SelectModel> select(BasicColumn... selectList) {
         return SelectDSL.select(selectList);
     }
 
-    static FromGatherer<SelectModel> select(Collection<BasicColumn> selectList) {
+    static FromGatherer<SelectModel> select(Collection<? extends BasicColumn> selectList) {
         return SelectDSL.select(selectList);
     }
 
@@ -225,7 +225,7 @@ static FromGatherer<SelectModel> selectDistinct(BasicColumn... selectList) {
         return SelectDSL.selectDistinct(selectList);
     }
 
-    static FromGatherer<SelectModel> selectDistinct(Collection<BasicColumn> selectList) {
+    static FromGatherer<SelectModel> selectDistinct(Collection<? extends BasicColumn> selectList) {
         return SelectDSL.selectDistinct(selectList);
     }
 
diff --git a/src/main/java/org/mybatis/dynamic/sql/common/OrderByModel.java b/src/main/java/org/mybatis/dynamic/sql/common/OrderByModel.java
index d185177da..54cc8d6f2 100644
--- a/src/main/java/org/mybatis/dynamic/sql/common/OrderByModel.java
+++ b/src/main/java/org/mybatis/dynamic/sql/common/OrderByModel.java
@@ -29,7 +29,7 @@
 public class OrderByModel {
     private final List<SortSpecification> columns = new ArrayList<>();
 
-    private OrderByModel(Collection<SortSpecification> columns) {
+    private OrderByModel(Collection<? extends SortSpecification> columns) {
         Objects.requireNonNull(columns);
         if (columns.isEmpty()) {
             throw new InvalidSqlException(Messages.getString("ERROR.12")); //$NON-NLS-1$
@@ -41,7 +41,7 @@ public <R> Stream<R> mapColumns(Function<SortSpecification, R> mapper) {
         return columns.stream().map(mapper);
     }
 
-    public static OrderByModel of(Collection<SortSpecification> columns) {
+    public static OrderByModel of(Collection<? extends SortSpecification> columns) {
         return new OrderByModel(columns);
     }
 }
diff --git a/src/main/java/org/mybatis/dynamic/sql/delete/DeleteDSL.java b/src/main/java/org/mybatis/dynamic/sql/delete/DeleteDSL.java
index d0b54e8bd..e405eccc3 100644
--- a/src/main/java/org/mybatis/dynamic/sql/delete/DeleteDSL.java
+++ b/src/main/java/org/mybatis/dynamic/sql/delete/DeleteDSL.java
@@ -65,7 +65,7 @@ public DeleteDSL<R> orderBy(SortSpecification... columns) {
         return orderBy(Arrays.asList(columns));
     }
 
-    public DeleteDSL<R> orderBy(Collection<SortSpecification> columns) {
+    public DeleteDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
         orderByModel = OrderByModel.of(columns);
         return this;
     }
@@ -123,7 +123,7 @@ public DeleteDSL<R> orderBy(SortSpecification... columns) {
             return orderBy(Arrays.asList(columns));
         }
 
-        public DeleteDSL<R> orderBy(Collection<SortSpecification> columns) {
+        public DeleteDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
             orderByModel = OrderByModel.of(columns);
             return DeleteDSL.this;
         }
diff --git a/src/main/java/org/mybatis/dynamic/sql/insert/BatchInsertDSL.java b/src/main/java/org/mybatis/dynamic/sql/insert/BatchInsertDSL.java
index c192726a1..219209e79 100644
--- a/src/main/java/org/mybatis/dynamic/sql/insert/BatchInsertDSL.java
+++ b/src/main/java/org/mybatis/dynamic/sql/insert/BatchInsertDSL.java
@@ -126,7 +126,7 @@ public B withTable(SqlTable table) {
             return getThis();
         }
 
-        public B withColumnMappings(Collection<AbstractColumnMapping> columnMappings) {
+        public B withColumnMappings(Collection<? extends AbstractColumnMapping> columnMappings) {
             this.columnMappings.addAll(columnMappings);
             return getThis();
         }
diff --git a/src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertDSL.java b/src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertDSL.java
index ada907189..6619dc084 100644
--- a/src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertDSL.java
+++ b/src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertDSL.java
@@ -119,7 +119,7 @@ public Builder withTable(SqlTable table) {
             return this;
         }
 
-        public Builder withColumnMappings(Collection<AbstractColumnMapping> columnMappings) {
+        public Builder withColumnMappings(Collection<? extends AbstractColumnMapping> columnMappings) {
             this.columnMappings.addAll(columnMappings);
             return this;
         }
diff --git a/src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertModel.java b/src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertModel.java
index 9366cdc3e..2a504da2a 100644
--- a/src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertModel.java
+++ b/src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertModel.java
@@ -68,7 +68,7 @@ public Builder withTable(SqlTable table) {
             return this;
         }
 
-        public Builder withInsertMappings(List<AbstractColumnMapping> insertMappings) {
+        public Builder withInsertMappings(List<? extends AbstractColumnMapping> insertMappings) {
             this.insertMappings.addAll(insertMappings);
             return this;
         }
diff --git a/src/main/java/org/mybatis/dynamic/sql/insert/InsertDSL.java b/src/main/java/org/mybatis/dynamic/sql/insert/InsertDSL.java
index 9ffe01351..24f638424 100644
--- a/src/main/java/org/mybatis/dynamic/sql/insert/InsertDSL.java
+++ b/src/main/java/org/mybatis/dynamic/sql/insert/InsertDSL.java
@@ -127,7 +127,7 @@ public Builder<T> withTable(SqlTable table) {
             return this;
         }
 
-        public Builder<T> withColumnMappings(Collection<AbstractColumnMapping> columnMappings) {
+        public Builder<T> withColumnMappings(Collection<? extends AbstractColumnMapping> columnMappings) {
             this.columnMappings.addAll(columnMappings);
             return this;
         }
diff --git a/src/main/java/org/mybatis/dynamic/sql/insert/InsertModel.java b/src/main/java/org/mybatis/dynamic/sql/insert/InsertModel.java
index 16fab7a6f..cb229aefa 100644
--- a/src/main/java/org/mybatis/dynamic/sql/insert/InsertModel.java
+++ b/src/main/java/org/mybatis/dynamic/sql/insert/InsertModel.java
@@ -83,7 +83,7 @@ public Builder<T> withRow(T row) {
             return this;
         }
 
-        public Builder<T> withColumnMappings(List<AbstractColumnMapping> columnMappings) {
+        public Builder<T> withColumnMappings(List<? extends AbstractColumnMapping> columnMappings) {
             this.columnMappings.addAll(columnMappings);
             return this;
         }
diff --git a/src/main/java/org/mybatis/dynamic/sql/select/GroupByModel.java b/src/main/java/org/mybatis/dynamic/sql/select/GroupByModel.java
index 2aa700804..3781f023e 100644
--- a/src/main/java/org/mybatis/dynamic/sql/select/GroupByModel.java
+++ b/src/main/java/org/mybatis/dynamic/sql/select/GroupByModel.java
@@ -29,7 +29,7 @@
 public class GroupByModel {
     private final List<BasicColumn> columns = new ArrayList<>();
 
-    private GroupByModel(Collection<BasicColumn> columns) {
+    private GroupByModel(Collection<? extends BasicColumn> columns) {
         Objects.requireNonNull(columns);
         if (columns.isEmpty()) {
             throw new InvalidSqlException(Messages.getString("ERROR.11")); //$NON-NLS-1$
@@ -41,7 +41,7 @@ public <R> Stream<R> mapColumns(Function<BasicColumn, R> mapper) {
         return columns.stream().map(mapper);
     }
 
-    public static GroupByModel of(Collection<BasicColumn> columns) {
+    public static GroupByModel of(Collection<? extends BasicColumn> columns) {
         return new GroupByModel(columns);
     }
 }
diff --git a/src/main/java/org/mybatis/dynamic/sql/select/MultiSelectDSL.java b/src/main/java/org/mybatis/dynamic/sql/select/MultiSelectDSL.java
index 3ab4bf88b..2f03fedf8 100644
--- a/src/main/java/org/mybatis/dynamic/sql/select/MultiSelectDSL.java
+++ b/src/main/java/org/mybatis/dynamic/sql/select/MultiSelectDSL.java
@@ -51,7 +51,7 @@ public MultiSelectDSL orderBy(SortSpecification... columns) {
         return orderBy(Arrays.asList(columns));
     }
 
-    public MultiSelectDSL orderBy(Collection<SortSpecification> columns) {
+    public MultiSelectDSL orderBy(Collection<? extends SortSpecification> columns) {
         orderByModel = OrderByModel.of(columns);
         return this;
     }
diff --git a/src/main/java/org/mybatis/dynamic/sql/select/QueryExpressionDSL.java b/src/main/java/org/mybatis/dynamic/sql/select/QueryExpressionDSL.java
index 15c07e2ba..422f915f2 100644
--- a/src/main/java/org/mybatis/dynamic/sql/select/QueryExpressionDSL.java
+++ b/src/main/java/org/mybatis/dynamic/sql/select/QueryExpressionDSL.java
@@ -162,7 +162,7 @@ public GroupByFinisher groupBy(BasicColumn... columns) {
         return groupBy(Arrays.asList(columns));
     }
 
-    public GroupByFinisher groupBy(Collection<BasicColumn> columns) {
+    public GroupByFinisher groupBy(Collection<? extends BasicColumn> columns) {
         groupByModel = GroupByModel.of(columns);
         return new GroupByFinisher();
     }
@@ -171,7 +171,7 @@ public SelectDSL<R> orderBy(SortSpecification... columns) {
         return orderBy(Arrays.asList(columns));
     }
 
-    public SelectDSL<R> orderBy(Collection<SortSpecification> columns) {
+    public SelectDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
         selectDSL.orderBy(columns);
         return selectDSL;
     }
@@ -261,7 +261,7 @@ public Builder<R> withConnector(String connector) {
                 return this;
             }
 
-            public Builder<R> withSelectList(Collection<BasicColumn> selectList) {
+            public Builder<R> withSelectList(Collection<? extends BasicColumn> selectList) {
                 this.selectList.addAll(selectList);
                 return this;
             }
@@ -300,7 +300,7 @@ public SelectDSL<R> orderBy(SortSpecification... columns) {
             return orderBy(Arrays.asList(columns));
         }
 
-        public SelectDSL<R> orderBy(Collection<SortSpecification> columns) {
+        public SelectDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
             return QueryExpressionDSL.this.orderBy(columns);
         }
 
@@ -308,7 +308,7 @@ public GroupByFinisher groupBy(BasicColumn... columns) {
             return groupBy(Arrays.asList(columns));
         }
 
-        public GroupByFinisher groupBy(Collection<BasicColumn> columns) {
+        public GroupByFinisher groupBy(Collection<? extends BasicColumn> columns) {
             return QueryExpressionDSL.this.groupBy(columns);
         }
 
@@ -474,7 +474,7 @@ public GroupByFinisher groupBy(BasicColumn... columns) {
             return groupBy(Arrays.asList(columns));
         }
 
-        public GroupByFinisher groupBy(Collection<BasicColumn> columns) {
+        public GroupByFinisher groupBy(Collection<? extends BasicColumn> columns) {
             return QueryExpressionDSL.this.groupBy(columns);
         }
 
@@ -490,7 +490,7 @@ public SelectDSL<R> orderBy(SortSpecification... columns) {
             return orderBy(Arrays.asList(columns));
         }
 
-        public SelectDSL<R> orderBy(Collection<SortSpecification> columns) {
+        public SelectDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
             return QueryExpressionDSL.this.orderBy(columns);
         }
 
@@ -512,7 +512,7 @@ public SelectDSL<R> orderBy(SortSpecification... columns) {
             return orderBy(Arrays.asList(columns));
         }
 
-        public SelectDSL<R> orderBy(Collection<SortSpecification> columns) {
+        public SelectDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
             return QueryExpressionDSL.this.orderBy(columns);
         }
 
@@ -600,7 +600,7 @@ public SelectDSL<R> orderBy(SortSpecification... columns) {
             return orderBy(Arrays.asList(columns));
         }
 
-        public SelectDSL<R> orderBy(Collection<SortSpecification> columns) {
+        public SelectDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
             return QueryExpressionDSL.this.orderBy(columns);
         }
 
diff --git a/src/main/java/org/mybatis/dynamic/sql/select/QueryExpressionModel.java b/src/main/java/org/mybatis/dynamic/sql/select/QueryExpressionModel.java
index 10e1e044a..f1e27d7ee 100644
--- a/src/main/java/org/mybatis/dynamic/sql/select/QueryExpressionModel.java
+++ b/src/main/java/org/mybatis/dynamic/sql/select/QueryExpressionModel.java
@@ -95,7 +95,7 @@ public Optional<HavingModel> havingModel() {
         return Optional.ofNullable(havingModel);
     }
 
-    public static Builder withSelectList(List<BasicColumn> columnList) {
+    public static Builder withSelectList(List<? extends BasicColumn> columnList) {
         return new Builder().withSelectList(columnList);
     }
 
@@ -130,7 +130,7 @@ public Builder withSelectColumn(BasicColumn selectColumn) {
             return this;
         }
 
-        public Builder withSelectList(List<BasicColumn> selectList) {
+        public Builder withSelectList(List<? extends BasicColumn> selectList) {
             this.selectList.addAll(selectList);
             return this;
         }
diff --git a/src/main/java/org/mybatis/dynamic/sql/select/SelectDSL.java b/src/main/java/org/mybatis/dynamic/sql/select/SelectDSL.java
index 7e75b27fc..08f62d1f1 100644
--- a/src/main/java/org/mybatis/dynamic/sql/select/SelectDSL.java
+++ b/src/main/java/org/mybatis/dynamic/sql/select/SelectDSL.java
@@ -58,7 +58,7 @@ public static QueryExpressionDSL.FromGatherer<SelectModel> select(BasicColumn...
         return select(Arrays.asList(selectList));
     }
 
-    public static QueryExpressionDSL.FromGatherer<SelectModel> select(Collection<BasicColumn> selectList) {
+    public static QueryExpressionDSL.FromGatherer<SelectModel> select(Collection<? extends BasicColumn> selectList) {
         return select(Function.identity(), selectList);
     }
 
@@ -68,7 +68,7 @@ public static <R> QueryExpressionDSL.FromGatherer<R> select(Function<SelectModel
     }
 
     public static <R> QueryExpressionDSL.FromGatherer<R> select(Function<SelectModel, R> adapterFunction,
-            Collection<BasicColumn> selectList) {
+            Collection<? extends BasicColumn> selectList) {
         return new FromGatherer.Builder<R>()
                 .withSelectList(selectList)
                 .withSelectDSL(new SelectDSL<>(adapterFunction))
@@ -79,7 +79,7 @@ public static QueryExpressionDSL.FromGatherer<SelectModel> selectDistinct(BasicC
         return selectDistinct(Function.identity(), selectList);
     }
 
-    public static QueryExpressionDSL.FromGatherer<SelectModel> selectDistinct(Collection<BasicColumn> selectList) {
+    public static QueryExpressionDSL.FromGatherer<SelectModel> selectDistinct(Collection<? extends BasicColumn> selectList) {
         return selectDistinct(Function.identity(), selectList);
     }
 
@@ -89,7 +89,7 @@ public static <R> QueryExpressionDSL.FromGatherer<R> selectDistinct(Function<Sel
     }
 
     public static <R> QueryExpressionDSL.FromGatherer<R> selectDistinct(Function<SelectModel, R> adapterFunction,
-            Collection<BasicColumn> selectList) {
+            Collection<? extends BasicColumn> selectList) {
         return new FromGatherer.Builder<R>()
                 .withSelectList(selectList)
                 .withSelectDSL(new SelectDSL<>(adapterFunction))
@@ -101,7 +101,7 @@ void registerQueryExpression(QueryExpressionDSL<R> queryExpression) {
         queryExpressions.add(queryExpression);
     }
 
-    void orderBy(Collection<SortSpecification> columns) {
+    void orderBy(Collection<? extends SortSpecification> columns) {
         orderByModel = OrderByModel.of(columns);
     }
 
diff --git a/src/main/java/org/mybatis/dynamic/sql/update/UpdateDSL.java b/src/main/java/org/mybatis/dynamic/sql/update/UpdateDSL.java
index 524de9f87..f9a855d2a 100644
--- a/src/main/java/org/mybatis/dynamic/sql/update/UpdateDSL.java
+++ b/src/main/java/org/mybatis/dynamic/sql/update/UpdateDSL.java
@@ -86,7 +86,7 @@ public UpdateDSL<R> orderBy(SortSpecification... columns) {
         return orderBy(Arrays.asList(columns));
     }
 
-    public UpdateDSL<R> orderBy(Collection<SortSpecification> columns) {
+    public UpdateDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
         orderByModel = OrderByModel.of(columns);
         return this;
     }
@@ -206,7 +206,7 @@ public UpdateDSL<R> orderBy(SortSpecification... columns) {
             return orderBy(Arrays.asList(columns));
         }
 
-        public UpdateDSL<R> orderBy(Collection<SortSpecification> columns) {
+        public UpdateDSL<R> orderBy(Collection<? extends SortSpecification> columns) {
             orderByModel = OrderByModel.of(columns);
             return UpdateDSL.this;
         }
diff --git a/src/main/java/org/mybatis/dynamic/sql/update/UpdateModel.java b/src/main/java/org/mybatis/dynamic/sql/update/UpdateModel.java
index b676b2c12..e12db1dea 100644
--- a/src/main/java/org/mybatis/dynamic/sql/update/UpdateModel.java
+++ b/src/main/java/org/mybatis/dynamic/sql/update/UpdateModel.java
@@ -94,7 +94,7 @@ public static Builder withTable(SqlTable table) {
     public static class Builder extends CommonBuilder<Builder> {
         private final List<AbstractColumnMapping> columnMappings = new ArrayList<>();
 
-        public Builder withColumnMappings(List<AbstractColumnMapping> columnMappings) {
+        public Builder withColumnMappings(List<? extends AbstractColumnMapping> columnMappings) {
             this.columnMappings.addAll(columnMappings);
             return this;
         }