diff --git a/reana_commons/models.py b/reana_commons/models.py
index <HASH>..<HASH> 100644
--- a/reana_commons/models.py
+++ b/reana_commons/models.py
@@ -90,7 +90,7 @@ class Workflow(Base, Timestamp):
     id_ = Column(UUIDType, primary_key=True)
     name = Column(String(255))
     run_number = Column(Integer)
-    workspace_path = Column(String(255))
+    workspace_path = Column(String(2048))
     status = Column(Enum(WorkflowStatus), default=WorkflowStatus.created)
     owner_id = Column(UUIDType, ForeignKey('user_.id_'))
     specification = Column(JSONType)
@@ -196,8 +196,8 @@ class Job(Base, Timestamp):
     shared_file_system = Column(Boolean)
     docker_img = Column(String(256))
     experiment = Column(String(256))
-    cmd = Column(String(1024))
-    env_vars = Column(String(1024))
+    cmd = Column(String(10000))
+    env_vars = Column(String(10000))
     restart_count = Column(Integer)
     max_restart_count = Column(Integer)
     deleted = Column(Boolean)
models: increase string sizes

* Increases the sizes of string fields that could
  grow large.