diff --git a/java-showcase-3.21.0/gapic-showcase/pom.xml b/java-showcase-3.21.0/gapic-showcase/pom.xml
index a9e4de22fe..f630c4cae2 100644
--- a/java-showcase-3.21.0/gapic-showcase/pom.xml
+++ b/java-showcase-3.21.0/gapic-showcase/pom.xml
@@ -19,7 +19,7 @@
   <properties>
     <gapic-showcase.version>0.36.2</gapic-showcase.version>
     <!-- This is the last version supporting slf4j 1.x, do not upgrade -->
-    <slf4j1-logback.version>1.2.13</slf4j1-logback.version>
+    <slf4j1-logback.version>1.5.25</slf4j1-logback.version>
     <slf4j2-logback.version>1.5.21</slf4j2-logback.version>
   </properties>
 
diff --git a/java-showcase-3.25.8/gapic-showcase/pom.xml b/java-showcase-3.25.8/gapic-showcase/pom.xml
index a9e4de22fe..f630c4cae2 100644
--- a/java-showcase-3.25.8/gapic-showcase/pom.xml
+++ b/java-showcase-3.25.8/gapic-showcase/pom.xml
@@ -19,7 +19,7 @@
   <properties>
     <gapic-showcase.version>0.36.2</gapic-showcase.version>
     <!-- This is the last version supporting slf4j 1.x, do not upgrade -->
-    <slf4j1-logback.version>1.2.13</slf4j1-logback.version>
+    <slf4j1-logback.version>1.5.25</slf4j1-logback.version>
     <slf4j2-logback.version>1.5.21</slf4j2-logback.version>
   </properties>
 
diff --git a/java-showcase/gapic-showcase/pom.xml b/java-showcase/gapic-showcase/pom.xml
index feeead440b..f8bfc9f781 100644
--- a/java-showcase/gapic-showcase/pom.xml
+++ b/java-showcase/gapic-showcase/pom.xml
@@ -19,7 +19,7 @@
   <properties>
     <gapic-showcase.version>0.36.2</gapic-showcase.version>
     <!-- This is the last version supporting slf4j 1.x, do not upgrade -->
-    <slf4j1-logback.version>1.2.13</slf4j1-logback.version>
+    <slf4j1-logback.version>1.5.25</slf4j1-logback.version>
     <slf4j2-logback.version>1.5.21</slf4j2-logback.version>
   </properties>