diff --git a/mistletoe/block_token.py b/mistletoe/block_token.py
index 9a2f85e..3133d47 100644
--- a/mistletoe/block_token.py
+++ b/mistletoe/block_token.py
@@ -366,6 +366,11 @@ def content(self):
         """Returns the code block content."""
         return self.children[0].content
 
+    @content.setter
+    def content(self, value):
+        """Sets the code block content."""
+        self.children[0].content = value
+
     @staticmethod
     def start(line):
         return line.replace('\t', '    ', 1).startswith('    ')
@@ -429,6 +434,11 @@ def content(self):
         """Returns the code block content."""
         return self.children[0].content
 
+    @content.setter
+    def content(self, value):
+        """Sets the code block content."""
+        self.children[0].content = value
+
     @classmethod
     def start(cls, line):
         match_obj = cls.pattern.match(line)
@@ -1040,6 +1050,11 @@ def content(self):
         """Returns the raw HTML content."""
         return self.children[0].content
 
+    @content.setter
+    def content(self, value):
+        """Sets the code block content."""
+        self.children[0].content = value
+
     @classmethod
     def start(cls, line):
         stripped = line.lstrip()