diff --git a/src/keri/db/basing.py b/src/keri/db/basing.py
index d4263fc91..090b357d4 100644
--- a/src/keri/db/basing.py
+++ b/src/keri/db/basing.py
@@ -494,6 +494,9 @@ def reopenDB(db, clear=False, **kwa):
         db.close(clear=clear)
 
 
+KERIBaserMapSizeKey = "KERI_BASER_MAP_SIZE"
+
+
 class Baser(dbing.LMDBer):
     """
     Baser sets up named sub databases with Keri Event Logs within main database
@@ -773,6 +776,9 @@ def __init__(self, headDirPath=None, reopen=False, **kwa):
         self._kevers = dbdict()
         self._kevers.db = self  # assign db for read through cache of kevers
 
+        if (mapSize := os.getenv(KERIBaserMapSizeKey)) is not None:
+            self.MapSize = int(mapSize)
+
         super(Baser, self).__init__(headDirPath=headDirPath, reopen=reopen, **kwa)
 
     @property
diff --git a/src/keri/db/dbing.py b/src/keri/db/dbing.py
index d3831e214..bd2db031f 100644
--- a/src/keri/db/dbing.py
+++ b/src/keri/db/dbing.py
@@ -306,6 +306,7 @@ class LMDBer(filing.Filer):
     TempSuffix = "_test"
     Perm = stat.S_ISVTX | stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR  # 0o1700==960
     MaxNamedDBs = 96
+    MapSize = 104857600
 
 
     def __init__(self, readonly=False, **kwa):
@@ -380,7 +381,7 @@ def reopen(self, readonly=False, **kwa):
 
         # open lmdb major database instance
         # creates files data.mdb and lock.mdb in .dbDirPath
-        self.env = lmdb.open(self.path, max_dbs=self.MaxNamedDBs, map_size=104857600,
+        self.env = lmdb.open(self.path, max_dbs=self.MaxNamedDBs, map_size=self.MapSize,
                              mode=self.perm, readonly=self.readonly)
         self.opened = True if opened and self.env else False
         return self.opened