diff --git a/instant-ssl-reloading-with-spring-tomcat/pom.xml b/instant-ssl-reloading-with-spring-tomcat/pom.xml
index 213cfc6..854aed6 100644
--- a/instant-ssl-reloading-with-spring-tomcat/pom.xml
+++ b/instant-ssl-reloading-with-spring-tomcat/pom.xml
@@ -14,6 +14,11 @@
     <packaging>jar</packaging>
 
     <dependencies>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>${version.slf4j-simple}</version>
+        </dependency>
         <dependency>
             <groupId>io.github.hakky54</groupId>
             <artifactId>sslcontext-kickstart</artifactId>
diff --git a/pom.xml b/pom.xml
index 403b8e7..5d0b8d5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,7 +61,7 @@
         <version.sslcontext-kickstart>8.3.1</version.sslcontext-kickstart>
         <version.logcaptor>2.9.0</version.logcaptor>
         <version.spring>2.7.5</version.spring>
-        <version-tomcat>10.1.19</version-tomcat>
+        <version-tomcat>9.0.86</version-tomcat>
         <version.aspectweaver>1.9.9.1</version.aspectweaver>
         <version.jackson>2.14.1</version.jackson>
         <version.slf4j>2.0.6</version.slf4j>