diff --git a/cbv/migrations/0010_auto_20230104_0019.py b/cbv/migrations/0010_auto_20230104_0019.py
new file mode 100644
index 00000000..f941b22c
--- /dev/null
+++ b/cbv/migrations/0010_auto_20230104_0019.py
@@ -0,0 +1,30 @@
+# Generated by Django 3.1.14 on 2023-01-04 00:19
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [("cbv", "0009_move_unique_constraint")]
+
+    operations = [
+        migrations.AlterField(
+            model_name="klass",
+            name="docstring",
+            field=models.TextField(default=""),
+        ),
+        migrations.AlterField(
+            model_name="method",
+            name="docstring",
+            field=models.TextField(default=""),
+        ),
+        migrations.AlterField(
+            model_name="module",
+            name="docstring",
+            field=models.TextField(default=""),
+        ),
+        migrations.AlterField(
+            model_name="projectversion",
+            name="sortable_version_number",
+            field=models.CharField(max_length=200),
+        ),
+    ]
diff --git a/cbv/models.py b/cbv/models.py
index 8825ad4a..dddae0d3 100644
--- a/cbv/models.py
+++ b/cbv/models.py
@@ -17,7 +17,7 @@ class ProjectVersion(models.Model):
     """Represents a particular version of a project in a python project hierarchy"""
 
     version_number = models.CharField(max_length=200)
-    sortable_version_number = models.CharField(max_length=200, blank=True)
+    sortable_version_number = models.CharField(max_length=200)
 
     objects = ProjectVersionManager()
 
@@ -66,7 +66,7 @@ class Module(models.Model):
 
     project_version = models.ForeignKey(ProjectVersion, models.CASCADE)
     name = models.CharField(max_length=200)
-    docstring = models.TextField(blank=True, default="")
+    docstring = models.TextField(default="")
     filename = models.CharField(max_length=511, default="")
 
     objects = ModuleManager()
@@ -140,7 +140,7 @@ class Klass(models.Model):
 
     module = models.ForeignKey(Module, models.CASCADE)
     name = models.CharField(max_length=200)
-    docstring = models.TextField(blank=True, default="")
+    docstring = models.TextField(default="")
     line_number = models.IntegerField()
     import_path = models.CharField(max_length=255)
     # because docs urls differ between Django versions
@@ -353,7 +353,7 @@ class Method(models.Model):
 
     klass = models.ForeignKey(Klass, models.CASCADE)
     name = models.CharField(max_length=200)
-    docstring = models.TextField(blank=True, default="")
+    docstring = models.TextField(default="")
     code = models.TextField()
     kwargs = models.CharField(max_length=200)
     line_number = models.IntegerField()