diff --git a/alembic/versions/4aa1bab989f8_add_email_token.py b/alembic/versions/4aa1bab989f8_add_email_token.py
index e6409c9b..07c7ae1b 100644
--- a/alembic/versions/4aa1bab989f8_add_email_token.py
+++ b/alembic/versions/4aa1bab989f8_add_email_token.py
@@ -28,7 +28,7 @@ def upgrade():
             nullable=False,
         ),
         sa.Column("value", sa.VARCHAR(length=64), nullable=False, unique=True),
-        sa.Column("valid", sa.BOOLEAN, nullable=False),
+        sa.Column("valid", sa.BOOLEAN),
     )
 
 
diff --git a/alembic/versions/83f862086ff0_add_flag_lock.py b/alembic/versions/83f862086ff0_add_flag_lock.py
index b04dccf9..48dd8639 100644
--- a/alembic/versions/83f862086ff0_add_flag_lock.py
+++ b/alembic/versions/83f862086ff0_add_flag_lock.py
@@ -17,7 +17,7 @@
 
 
 def upgrade():
-    op.add_column("flag", sa.Column("_locked", sa.BOOLEAN, nullable=False, default=False))
+    op.add_column("flag", sa.Column("_locked", sa.BOOLEAN))
 
 
 def downgrade():
diff --git a/alembic/versions/8fa7d8ac2b2f_add_password_token_table.py b/alembic/versions/8fa7d8ac2b2f_add_password_token_table.py
index bd709d31..eff75be4 100644
--- a/alembic/versions/8fa7d8ac2b2f_add_password_token_table.py
+++ b/alembic/versions/8fa7d8ac2b2f_add_password_token_table.py
@@ -28,7 +28,7 @@ def upgrade():
             nullable=False,
         ),
         sa.Column("value", sa.VARCHAR(length=64), nullable=False, unique=True),
-        sa.Column("used", sa.BOOLEAN, nullable=False, default=False),
+        sa.Column("used", sa.BOOLEAN),
     )
 
 
diff --git a/alembic/versions/9443ded40161_add_box_lock.py b/alembic/versions/9443ded40161_add_box_lock.py
index 56d47608..a8693ef8 100644
--- a/alembic/versions/9443ded40161_add_box_lock.py
+++ b/alembic/versions/9443ded40161_add_box_lock.py
@@ -17,7 +17,7 @@
 
 
 def upgrade():
-    op.add_column("box", sa.Column("_locked", sa.BOOLEAN, nullable=False, default=False))
+    op.add_column("box", sa.Column("_locked", sa.BOOLEAN))
 
 
 def downgrade():