diff --git a/relational-schemas/ChangeLog.md b/relational-schemas/ChangeLog.md
index e95a8c0a..60edf611 100644
--- a/relational-schemas/ChangeLog.md
+++ b/relational-schemas/ChangeLog.md
@@ -1,5 +1,9 @@
 <!-- -*- Markdown -*- -->
 
+## 0.1.8.1
+
+- fix typo.
+
 ## 0.1.8.0
 
 - update for GHC 8.8.x.
diff --git a/relational-schemas/relational-schemas.cabal b/relational-schemas/relational-schemas.cabal
index ccdea8f2..3a7a2d70 100644
--- a/relational-schemas/relational-schemas.cabal
+++ b/relational-schemas/relational-schemas.cabal
@@ -1,5 +1,5 @@
 name:                relational-schemas
-version:             0.1.8.0
+version:             0.1.8.1
 synopsis:            RDBMSs' schema templates for relational-query
 description:         This package contains some RDBMSs' schema structure definitions.
                      .