diff --git a/pom.xml b/pom.xml
index bf5119b..4242c24 100644
--- a/pom.xml
+++ b/pom.xml
@@ -11,7 +11,7 @@
     <properties>
         <ktor_version>2.1.3</ktor_version>
         <kotlin.code.style>official</kotlin.code.style>
-        <kotlin_version>1.7.21</kotlin_version>
+        <kotlin_version>1.7.20</kotlin_version>
         <kotlin.compiler.jvmTarget>11</kotlin.compiler.jvmTarget>
         <logback_version>1.4.4</logback_version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -115,7 +115,7 @@
         <dependency>
             <groupId>com.google.firebase</groupId>
             <artifactId>firebase-admin</artifactId>
-            <version>9.1.1</version>
+            <version>9.1.0</version>
         </dependency>
     </dependencies>