diff --git a/gestalt-android-testbed/build.gradle b/gestalt-android-testbed/build.gradle
index 76ad6ad7..ab80578f 100644
--- a/gestalt-android-testbed/build.gradle
+++ b/gestalt-android-testbed/build.gradle
@@ -42,7 +42,13 @@ dependencies {
     implementation(project(":gestalt-asset-core"))
     implementation(project(":gestalt-entity-system"))
     implementation(libs.guava)
-    implementation(libs.slf4j.api)
+    // Pinned strictly below the catalog's slf4j-api (2.x, pulled in transitively
+    // via gestalt-android/gestalt-module etc.): logback-android (up to 1.3.0-3,
+    // the latest release supporting our minSdk 24) predates SLF4J 2.x's provider
+    // mechanism, so pairing it with slf4j-api 2.x silently no-ops all logging.
+    implementation("org.slf4j:slf4j-api") {
+        version { strictly("1.7.25") }
+    }
     implementation("com.github.tony19:logback-android:1.3.0-3")
     implementation(project(":testpack:testpack-api"))
     testImplementation(libs.junit)
diff --git a/gestalt-android/build.gradle b/gestalt-android/build.gradle
index 3dc0ffac..6b1c0f71 100644
--- a/gestalt-android/build.gradle
+++ b/gestalt-android/build.gradle
@@ -47,7 +47,13 @@ dependencies {
         exclude group: "org.javassist", module: "javassist"
     }
     implementation(project(":gestalt-util"))
-    implementation(libs.slf4j.api)
+    // Pinned strictly below the catalog's slf4j-api (2.x, pulled in transitively
+    // via gestalt-module etc.): logback-android (up to 1.3.0-3, the latest
+    // release supporting our minSdk 24) predates SLF4J 2.x's provider mechanism,
+    // so pairing it with slf4j-api 2.x silently no-ops all logging.
+    implementation("org.slf4j:slf4j-api") {
+        version { strictly("1.7.25") }
+    }
     implementation(libs.guava)
 
     implementation("androidx.appcompat:appcompat:1.7.0")
diff --git a/gestalt-asset-core/gradle.lockfile b/gestalt-asset-core/gradle.lockfile
index ecbd88e1..a0d9703f 100644
--- a/gestalt-asset-core/gradle.lockfile
+++ b/gestalt-asset-core/gradle.lockfile
@@ -2,8 +2,8 @@
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
 # To regenerate this file, run: ./gradlew :gestalt-asset-core:dependencies --write-locks
-ch.qos.logback:logback-classic:1.2.3=testCompileClasspath,testRuntimeClasspath
-ch.qos.logback:logback-core:1.2.3=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-classic:1.6.0=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-core:1.6.0=testCompileClasspath,testRuntimeClasspath
 com.android.support:support-annotations:28.0.0=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
 com.github.zafarkhaja:java-semver:0.10.2=annotationProcessor,runtimeClasspath,testAnnotationProcessor,testRuntimeClasspath
 com.google.code.findbugs:jsr305:3.0.2=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
@@ -30,5 +30,5 @@ org.javassist:javassist:3.27.0-GA=runtimeClasspath,testRuntimeClasspath
 org.mockito:mockito-core:5.23.0=testCompileClasspath,testRuntimeClasspath
 org.objenesis:objenesis:3.3=testRuntimeClasspath
 org.ow2.asm:asm:9.7=animalsniffer
-org.slf4j:slf4j-api:1.7.25=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
+org.slf4j:slf4j-api:2.0.18=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
 empty=
diff --git a/gestalt-di/gradle.lockfile b/gestalt-di/gradle.lockfile
index 2b36c0a3..f47ccddc 100644
--- a/gestalt-di/gradle.lockfile
+++ b/gestalt-di/gradle.lockfile
@@ -2,8 +2,8 @@
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
 # To regenerate this file, run: ./gradlew :gestalt-di:dependencies --write-locks
-ch.qos.logback:logback-classic:1.2.3=testCompileClasspath,testRuntimeClasspath
-ch.qos.logback:logback-core:1.2.3=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-classic:1.6.0=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-core:1.6.0=testCompileClasspath,testRuntimeClasspath
 com.android.support:support-annotations:28.0.0=testAnnotationProcessor,testRuntimeClasspath
 com.github.zafarkhaja:java-semver:0.10.2=testAnnotationProcessor,testRuntimeClasspath
 com.google.code.findbugs:jsr305:3.0.2=compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
@@ -31,5 +31,5 @@ org.javassist:javassist:3.27.0-GA=testRuntimeClasspath
 org.mockito:mockito-core:5.23.0=testCompileClasspath,testRuntimeClasspath
 org.objenesis:objenesis:3.3=testRuntimeClasspath
 org.ow2.asm:asm:9.7=animalsniffer
-org.slf4j:slf4j-api:1.7.25=compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
+org.slf4j:slf4j-api:2.0.18=compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
 empty=annotationProcessor
diff --git a/gestalt-entity-system/gradle.lockfile b/gestalt-entity-system/gradle.lockfile
index 779f6836..77a15e43 100644
--- a/gestalt-entity-system/gradle.lockfile
+++ b/gestalt-entity-system/gradle.lockfile
@@ -2,8 +2,8 @@
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
 # To regenerate this file, run: ./gradlew :gestalt-entity-system:dependencies --write-locks
-ch.qos.logback:logback-classic:1.2.3=testCompileClasspath,testRuntimeClasspath
-ch.qos.logback:logback-core:1.2.3=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-classic:1.6.0=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-core:1.6.0=testCompileClasspath,testRuntimeClasspath
 com.android.support:support-annotations:28.0.0=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
 com.github.zafarkhaja:java-semver:0.10.2=annotationProcessor,runtimeClasspath,testAnnotationProcessor,testRuntimeClasspath
 com.google.code.findbugs:jsr305:3.0.2=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
@@ -31,5 +31,5 @@ org.javassist:javassist:3.27.0-GA=runtimeClasspath,testRuntimeClasspath
 org.mockito:mockito-core:5.23.0=testCompileClasspath,testRuntimeClasspath
 org.objenesis:objenesis:3.3=testRuntimeClasspath
 org.ow2.asm:asm:9.7=animalsniffer
-org.slf4j:slf4j-api:1.7.25=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
+org.slf4j:slf4j-api:2.0.18=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
 empty=
diff --git a/gestalt-es-perf/gradle.lockfile b/gestalt-es-perf/gradle.lockfile
index 83da620a..f60d261e 100644
--- a/gestalt-es-perf/gradle.lockfile
+++ b/gestalt-es-perf/gradle.lockfile
@@ -2,8 +2,8 @@
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
 # To regenerate this file, run: ./gradlew :gestalt-es-perf:dependencies --write-locks
-ch.qos.logback:logback-classic:1.2.3=testCompileClasspath,testRuntimeClasspath
-ch.qos.logback:logback-core:1.2.3=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-classic:1.6.0=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-core:1.6.0=testCompileClasspath,testRuntimeClasspath
 com.android.support:support-annotations:28.0.0=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 com.github.zafarkhaja:java-semver:0.10.2=runtimeClasspath,testRuntimeClasspath
 com.google.code.findbugs:jsr305:3.0.2=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
@@ -30,5 +30,5 @@ org.javassist:javassist:3.27.0-GA=runtimeClasspath,testRuntimeClasspath
 org.mockito:mockito-core:5.23.0=testCompileClasspath,testRuntimeClasspath
 org.objenesis:objenesis:3.3=testRuntimeClasspath
 org.ow2.asm:asm:9.7=animalsniffer
-org.slf4j:slf4j-api:1.7.25=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
+org.slf4j:slf4j-api:2.0.18=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 empty=annotationProcessor,testAnnotationProcessor
diff --git a/gestalt-inject-java/gradle.lockfile b/gestalt-inject-java/gradle.lockfile
index f14a010a..ad6ad781 100644
--- a/gestalt-inject-java/gradle.lockfile
+++ b/gestalt-inject-java/gradle.lockfile
@@ -2,8 +2,8 @@
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
 # To regenerate this file, run: ./gradlew :gestalt-inject-java:dependencies --write-locks
-ch.qos.logback:logback-classic:1.2.3=testCompileClasspath,testRuntimeClasspath
-ch.qos.logback:logback-core:1.2.3=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-classic:1.6.0=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-core:1.6.0=testCompileClasspath,testRuntimeClasspath
 com.android.support:support-annotations:28.0.0=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 com.github.zafarkhaja:java-semver:0.10.2=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 com.google.code.findbugs:jsr305:3.0.2=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
@@ -28,5 +28,5 @@ org.hamcrest:hamcrest-core:1.3=testCompileClasspath,testRuntimeClasspath
 org.mockito:mockito-core:5.23.0=testCompileClasspath,testRuntimeClasspath
 org.objenesis:objenesis:3.3=testRuntimeClasspath
 org.ow2.asm:asm:9.7=animalsniffer
-org.slf4j:slf4j-api:1.7.25=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
+org.slf4j:slf4j-api:2.0.18=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 empty=annotationProcessor,testAnnotationProcessor
diff --git a/gestalt-inject/gradle.lockfile b/gestalt-inject/gradle.lockfile
index abfdc03b..81a3bf11 100644
--- a/gestalt-inject/gradle.lockfile
+++ b/gestalt-inject/gradle.lockfile
@@ -15,5 +15,5 @@ org.codehaus.mojo:animal-sniffer-annotations:1.17=compileClasspath,runtimeClassp
 org.codehaus.mojo:animal-sniffer-annotations:1.24=animalsniffer
 org.codehaus.mojo:animal-sniffer:1.24=animalsniffer
 org.ow2.asm:asm:9.7=animalsniffer
-org.slf4j:slf4j-api:1.7.25=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
+org.slf4j:slf4j-api:2.0.18=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 empty=annotationProcessor,testAnnotationProcessor
diff --git a/gestalt-module/gradle.lockfile b/gestalt-module/gradle.lockfile
index b29fe085..deb8d4f9 100644
--- a/gestalt-module/gradle.lockfile
+++ b/gestalt-module/gradle.lockfile
@@ -2,8 +2,8 @@
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
 # To regenerate this file, run: ./gradlew :gestalt-module:dependencies --write-locks
-ch.qos.logback:logback-classic:1.2.3=testCompileClasspath,testRuntimeClasspath
-ch.qos.logback:logback-core:1.2.3=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-classic:1.6.0=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-core:1.6.0=testCompileClasspath,testRuntimeClasspath
 com.android.support:support-annotations:28.0.0=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
 com.github.zafarkhaja:java-semver:0.10.2=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
 com.google.code.findbugs:jsr305:3.0.2=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
@@ -29,5 +29,5 @@ org.javassist:javassist:3.27.0-GA=compileClasspath,runtimeClasspath,testCompileC
 org.mockito:mockito-core:5.23.0=testCompileClasspath,testRuntimeClasspath
 org.objenesis:objenesis:3.3=testRuntimeClasspath
 org.ow2.asm:asm:9.7=animalsniffer
-org.slf4j:slf4j-api:1.7.25=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
+org.slf4j:slf4j-api:2.0.18=annotationProcessor,compileClasspath,runtimeClasspath,testAnnotationProcessor,testCompileClasspath,testRuntimeClasspath
 empty=
diff --git a/gestalt-util/gradle.lockfile b/gestalt-util/gradle.lockfile
index 8ec68493..f2057190 100644
--- a/gestalt-util/gradle.lockfile
+++ b/gestalt-util/gradle.lockfile
@@ -2,8 +2,8 @@
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
 # To regenerate this file, run: ./gradlew :gestalt-util:dependencies --write-locks
-ch.qos.logback:logback-classic:1.2.3=testCompileClasspath,testRuntimeClasspath
-ch.qos.logback:logback-core:1.2.3=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-classic:1.6.0=testCompileClasspath,testRuntimeClasspath
+ch.qos.logback:logback-core:1.6.0=testCompileClasspath,testRuntimeClasspath
 com.android.support:support-annotations:28.0.0=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 com.google.code.findbugs:jsr305:3.0.2=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 com.google.errorprone:error_prone_annotations:2.2.0=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
@@ -24,5 +24,5 @@ org.hamcrest:hamcrest-core:1.3=testCompileClasspath,testRuntimeClasspath
 org.mockito:mockito-core:5.23.0=testCompileClasspath,testRuntimeClasspath
 org.objenesis:objenesis:3.3=testRuntimeClasspath
 org.ow2.asm:asm:9.7=animalsniffer
-org.slf4j:slf4j-api:1.7.25=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
+org.slf4j:slf4j-api:2.0.18=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 empty=annotationProcessor,testAnnotationProcessor
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 334557b2..9b84b717 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -7,10 +7,10 @@ dependencyResolutionManagement {
             library("gson", "com.google.code.gson:gson:2.8.5")
             library("guava", "com.google.guava:guava:27.0.1-android")
             library("jcip", "net.jcip:jcip-annotations:1.0")
-            library("slf4j-api", "org.slf4j:slf4j-api:1.7.25")
+            library("slf4j-api", "org.slf4j:slf4j-api:2.0.18")
             // testing
             library("junit", "junit:junit:4.12")
-            library("logback", "ch.qos.logback:logback-classic:1.2.3")
+            library("logback", "ch.qos.logback:logback-classic:1.6.0")
             library("mockito", "org.mockito:mockito-core:5.23.0")
         }
     }