diff --git a/pepdbagent/_version.py b/pepdbagent/_version.py
index 4f504b1..9320b9c 100644
--- a/pepdbagent/_version.py
+++ b/pepdbagent/_version.py
@@ -1 +1 @@
-__version__ = "0.7.0a3"
+__version__ = "0.7.0a4"
diff --git a/pepdbagent/const.py b/pepdbagent/const.py
index 6fff364..31819c8 100644
--- a/pepdbagent/const.py
+++ b/pepdbagent/const.py
@@ -12,7 +12,7 @@
 DEFAULT_LIMIT = 100
 
 # db_dialects
-POSTGRES_DIALECT = "postgresql"
+POSTGRES_DIALECT = "postgresql+psycopg"
 
 DEFAULT_LIMIT_INFO = 5