diff --git a/lithic-java-client-okhttp/build.gradle.kts b/lithic-java-client-okhttp/build.gradle.kts
index 692d9562..b0450ea5 100644
--- a/lithic-java-client-okhttp/build.gradle.kts
+++ b/lithic-java-client-okhttp/build.gradle.kts
@@ -11,5 +11,5 @@ dependencies {
 
     testImplementation(kotlin("test"))
     testImplementation("org.assertj:assertj-core:3.25.3")
-    testImplementation("org.slf4j:slf4j-simple:1.7.36")
+    testImplementation("org.slf4j:slf4j-simple:2.0.12")
 }
diff --git a/lithic-java-core/build.gradle.kts b/lithic-java-core/build.gradle.kts
index d1669951..c0e642e8 100644
--- a/lithic-java-core/build.gradle.kts
+++ b/lithic-java-core/build.gradle.kts
@@ -20,7 +20,7 @@ dependencies {
     testImplementation("com.github.tomakehurst:wiremock-jre8:2.33.2")
     testImplementation("org.assertj:assertj-core:3.25.3")
     testImplementation("org.assertj:assertj-guava:3.25.3")
-    testImplementation("org.slf4j:slf4j-simple:1.7.36")
+    testImplementation("org.slf4j:slf4j-simple:2.0.12")
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.9.1")
     testImplementation("org.junit.jupiter:junit-jupiter-params:5.9.1")
 }