diff --git a/csst_common/pipeline.py b/csst_common/pipeline.py
index 75b8c95f50f069b49e43947853badfb81e61f4e0..488084c120136623ed1758e60b32b0e10477a969 100644
--- a/csst_common/pipeline.py
+++ b/csst_common/pipeline.py
@@ -16,7 +16,7 @@ import os
 import shutil
 import traceback
 import warnings
-from typing import Callable, NamedTuple, Optional, Any
+from typing import Callable, NamedTuple, Optional, Any, Union
 from astropy.time import Time, TimeDelta
 from astropy.io import fits
 
@@ -83,7 +83,7 @@ class Pipeline:
 
         # get pipeline information from env vars
         self.pipeline_id: str = os.getenv("PIPELINE_ID", "-")
-        self.build: str = os.getenv("BUILD", "-")
+        self.build: int = int(os.getenv("BUILD", "0"))
         self.created: str = os.getenv("CREATED", "-")
         self.verbose: bool = bool(os.getenv("VERBOSE", ""))
 
@@ -123,13 +123,15 @@ class Pipeline:
         # self.error_trace = ErrorTrace(os.path.join(self.dir_output, "error_trace"))
 
         if dfs:
-            self.dfs = DFS()
+            self.dfs: Union[DFS | None] = DFS()
         else:
-            self.dfs = None
+            self.dfs: Union[DFS | None] = None
         if ccds:
-            self.ccds = CCDS(ccds_root=ccds_root, ccds_cache=ccds_cache)
+            self.ccds: Union[CCDS | None] = CCDS(
+                ccds_root=ccds_root, ccds_cache=ccds_cache
+            )
         else:
-            self.ccds = None
+            self.ccds: Union[CCDS | None] = None
 
         if filter_warnings:
             self.filter_warnings()
@@ -148,7 +150,7 @@ class Pipeline:
         h.set("PIPELINE_ID", self.pipeline_id, comment="pipeline ID")
         h.set("BUILD", self.build, comment="pipeline build number")
         h.set("CREATED", self.pipeline_id, comment="pipeline build time")
-        return reformat_header(h, strip=False, comment="Pipeline summary")
+        return reformat_header(h, strip=False, comment="Pipeline info")
 
     def summarize(self):
         """Summarize this run."""