diff --git a/app/android/app/build.gradle.kts b/app/android/app/build.gradle.kts
index d3e4286..e569d09 100644
--- a/app/android/app/build.gradle.kts
+++ b/app/android/app/build.gradle.kts
@@ -55,6 +55,12 @@ android {
             } else {
                 signingConfigs.getByName("debug")
             }
+            // Keep rules for libraries that R8 cannot trace (ONNX Runtime
+            // reaches its Java classes from native code by name).
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro",
+            )
         }
     }
 }
diff --git a/app/android/app/proguard-rules.pro b/app/android/app/proguard-rules.pro
new file mode 100644
index 0000000..b7e3051
--- /dev/null
+++ b/app/android/app/proguard-rules.pro
@@ -0,0 +1,8 @@
+# ONNX Runtime's native library looks up its Java classes by name over JNI
+# (ai/onnxruntime/TensorInfo and friends). R8 cannot see those uses, so in
+# release builds it removed TensorInfo and renamed others. The first search
+# by meaning then aborted the app with "JNI DETECTED ERROR: java_class ==
+# null" in convertToTensorInfo (Play vitals, 1.0.61+79, 2026-10-21).
+# Keep the whole package exactly as shipped.
+-keep class ai.onnxruntime.** { *; }
+-keepclassmembers class ai.onnxruntime.** { *; }