diff --git a/sdk/build.gradle b/sdk/build.gradle
index d009b7d..db12bb5 100644
--- a/sdk/build.gradle
+++ b/sdk/build.gradle
@@ -26,6 +26,10 @@ android {
             }
         }
     }
+
+    kotlin {
+        explicitApi()
+    }
 }
 
 dependencies {
diff --git a/securesignals-gma/build.gradle b/securesignals-gma/build.gradle
index d76e078..51f5e35 100644
--- a/securesignals-gma/build.gradle
+++ b/securesignals-gma/build.gradle
@@ -18,6 +18,10 @@ android {
             minifyEnabled false
         }
     }
+
+    kotlin {
+        explicitApi()
+    }
 }
 
 dependencies {
diff --git a/securesignals-ima/build.gradle b/securesignals-ima/build.gradle
index 3d34365..5bc2ea4 100644
--- a/securesignals-ima/build.gradle
+++ b/securesignals-ima/build.gradle
@@ -18,6 +18,10 @@ android {
             minifyEnabled false
         }
     }
+
+    kotlin {
+        explicitApi()
+    }
 }
 
 dependencies {