diff --git a/.github/actions/publish-release-apk/entrypoint.sh b/.github/actions/publish-release-apk/entrypoint.sh
index 9e38ec9..110cc0b 100644
--- a/.github/actions/publish-release-apk/entrypoint.sh
+++ b/.github/actions/publish-release-apk/entrypoint.sh
@@ -2,6 +2,6 @@
 
 ls -a
 git config --global --add safe.directory /github/workspace
-hub checkout ${${REPO_BRANCH}:-master}
+hub checkout ${REPO_BRANCH:-master}
 VERSION_NAME=`grep -oP 'versionName = "\K(.*?)(?=")' ./${APP_FOLDER}/build.gradle.kts`
 hub release create -a ./${APP_FOLDER}/build/outputs/apk/${BUILD_FLAVOR}/${BUILD_TYPE}/*-${BUILD_TYPE}.apk -m "${RELEASE_TITLE} - v${VERSION_NAME}" v${VERSION_NAME}${TAG_SUFFIX}
diff --git a/.github/workflows/build_check.yml b/.github/workflows/build_check.yml
index 80e3a9a..699dd1e 100644
--- a/.github/workflows/build_check.yml
+++ b/.github/workflows/build_check.yml
@@ -12,10 +12,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: set up JDK 22
+    - name: set up JDK 21
       uses: actions/setup-java@v3
       with:
-        java-version: '22'
+        java-version: '21'
         distribution: 'oracle'
         cache: gradle
 
diff --git a/.github/workflows/publish_debug.yml b/.github/workflows/publish_debug.yml
index 544dc2d..b1d8b09 100644
--- a/.github/workflows/publish_debug.yml
+++ b/.github/workflows/publish_debug.yml
@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: set up JDK 22
+      - name: set up JDK 21
         uses: actions/setup-java@v3
         with:
-          java-version: '22'
+          java-version: '21'
           distribution: 'oracle'
           cache: gradle
 
diff --git a/.github/workflows/publish_release.yml b/.github/workflows/publish_release.yml
index 6e4b69f..8d07790 100644
--- a/.github/workflows/publish_release.yml
+++ b/.github/workflows/publish_release.yml
@@ -13,10 +13,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: set up JDK 22
+      - name: set up JDK 21
         uses: actions/setup-java@v3
         with:
-          java-version: '22'
+          java-version: '21'
           distribution: 'oracle'
           cache: gradle
 
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index fc6f42c..76d20db 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -26,8 +26,8 @@ android {
         minSdk = 29
         targetSdk = 35
 
-        versionCode = 1708536358
-        versionName = "0.26.2-beta"
+        versionCode = 1708536360
+        versionName = "0.26.4-beta"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
 
@@ -220,6 +220,6 @@ enum class JavaConfig(val jvmTarget: String, val jdkVersion: Int, val javaVersio
             }
         }
 
-        private val DEFAULT = JAVA_22
+        private val DEFAULT = JAVA_21
     }
 }
\ No newline at end of file