diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6d484d8..7fba173 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.12.17, 2.13.10]
+        scala: [2.12.20, 2.13.10]
         java: [temurin@11]
     runs-on: ${{ matrix.os }}
     steps:
@@ -72,7 +72,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.12.17]
+        scala: [2.12.20]
         java: [temurin@11]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/build.sbt b/build.sbt
index f950f6f..ccdbcaf 100644
--- a/build.sbt
+++ b/build.sbt
@@ -16,8 +16,8 @@ mergifyExtraConditions := Seq(
 inThisBuild(Seq(
   organization := "com.rms.miu",
 
-  scalaVersion := "2.12.17",
-  crossScalaVersions := Seq("2.12.17", "2.13.10"),
+  scalaVersion := "2.12.20",
+  crossScalaVersions := Seq("2.12.20", "2.13.10"),
 
   scalacOptions ++= Seq(
     "-deprecation",