diff --git a/Simperium/src/main/java/com/simperium/android/AndroidClient.java b/Simperium/src/main/java/com/simperium/android/AndroidClient.java
index 7b09dc4..5180db0 100644
--- a/Simperium/src/main/java/com/simperium/android/AndroidClient.java
+++ b/Simperium/src/main/java/com/simperium/android/AndroidClient.java
@@ -10,15 +10,28 @@
 import org.thoughtcrime.ssl.pinning.SystemKeyStore;
 
 import com.simperium.BuildConfig;
+import com.simperium.R;
 import com.simperium.Version;
 import com.simperium.client.ClientFactory;
 import com.simperium.util.Uuid;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.KeyManagementException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ExecutorService;
+
+import javax.net.ssl.SSLContext;
 import javax.net.ssl.TrustManager;
+import javax.net.ssl.TrustManagerFactory;
 
+import android.os.Build;
 import android.util.Log;
 
 /**
@@ -73,6 +86,25 @@ public AndroidClient(Context context){
 
         mSessionId = String.format("%s-%s", Version.LIBRARY_NAME, sessionToken);
 
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N_MR1) {
+            // This code manually adds two trusted certificates for SSL.
+            // See this for more info: https://letsencrypt.org/2023/07/10/cross-sign-expiration.
+            // I got the certificates directly from letsencrypt here: https://letsencrypt.org/certificates/.
+            try {
+                final SSLContext sslContext = SSLContext.getInstance("TLS");
+                final TrustManager[] customTrustManagers = new TrustManager[]{
+                        loadCertificate(context, R.raw.isrgrootx1),
+                        loadCertificate(context, R.raw.isrgrootx2)
+                };
+                sslContext.init(null, customTrustManagers, null);
+                mHttpClient.getSSLSocketMiddleware().setSSLContext(sslContext);
+            } catch (NoSuchAlgorithmException e) {
+                Log.e(TAG, "Problem getting instance of SSLContext");
+            } catch (KeyManagementException e) {
+                Log.e(TAG, "Problem trying to init SSLContext");
+            }
+        }
+
         TrustManager[] trustManagers = new TrustManager[] { buildPinnedTrustManager(context) };
         mHttpClient.getSSLSocketMiddleware().setTrustManagers(trustManagers);
 
@@ -84,6 +116,42 @@ public static TrustManager buildPinnedTrustManager(Context context) {
                                        new String[] { BuildConfig.SIMPERIUM_COM_SPKI }, 0);
     }
 
+    private static TrustManager loadCertificate(Context context, final int resource) {
+        try {
+            // Load PEM file
+            InputStream inputStream = context.getResources().openRawResource(resource);
+            // Create CertificateFactory Instance
+            CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
+
+            // Generate the keystore instance.
+            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
+            keyStore.load(null, null);
+
+            // Iterate over the certificates in the pem file and add them to the keystore
+            while (inputStream.available() > 0) {
+                java.security.cert.Certificate cert = certificateFactory.generateCertificate(inputStream);
+                String alias = cert.toString();
+                keyStore.setCertificateEntry(alias, cert);
+            }
+
+            // Create a TrustedManagerFactory instance
+            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
+            trustManagerFactory.init(keyStore);
+
+            TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
+            return trustManagers[0];
+        } catch (IOException e) {
+            Log.e(TAG, "Problem opening pem cert file", e);
+        } catch (CertificateException e) {
+            Log.e(TAG, "Problem getting instance of CertificateFactory", e);
+        } catch (KeyStoreException e) {
+            Log.e(TAG, "Problem getting a keystore instance", e);
+        } catch (NoSuchAlgorithmException e) {
+            Log.e(TAG, "Problem loading the keystore", e);
+        }
+        return null;
+    }
+
     public static SharedPreferences sharedPreferences(Context context){
         return context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
     }
diff --git a/Simperium/src/main/res/raw/isrgrootx1.pem b/Simperium/src/main/res/raw/isrgrootx1.pem
new file mode 100644
index 0000000..b85c803
--- /dev/null
+++ b/Simperium/src/main/res/raw/isrgrootx1.pem
@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
+MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
+TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
+cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMTUwNjA0MTEwNDM4
+WhcNMzUwNjA0MTEwNDM4WjBPMQswCQYDVQQGEwJVUzEpMCcGA1UEChMgSW50ZXJu
+ZXQgU2VjdXJpdHkgUmVzZWFyY2ggR3JvdXAxFTATBgNVBAMTDElTUkcgUm9vdCBY
+MTCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAK3oJHP0FDfzm54rVygc
+h77ct984kIxuPOZXoHj3dcKi/vVqbvYATyjb3miGbESTtrFj/RQSa78f0uoxmyF+
+0TM8ukj13Xnfs7j/EvEhmkvBioZxaUpmZmyPfjxwv60pIgbz5MDmgK7iS4+3mX6U
+A5/TR5d8mUgjU+g4rk8Kb4Mu0UlXjIB0ttov0DiNewNwIRt18jA8+o+u3dpjq+sW
+T8KOEUt+zwvo/7V3LvSye0rgTBIlDHCNAymg4VMk7BPZ7hm/ELNKjD+Jo2FR3qyH
+B5T0Y3HsLuJvW5iB4YlcNHlsdu87kGJ55tukmi8mxdAQ4Q7e2RCOFvu396j3x+UC
+B5iPNgiV5+I3lg02dZ77DnKxHZu8A/lJBdiB3QW0KtZB6awBdpUKD9jf1b0SHzUv
+KBds0pjBqAlkd25HN7rOrFleaJ1/ctaJxQZBKT5ZPt0m9STJEadao0xAH0ahmbWn
+OlFuhjuefXKnEgV4We0+UXgVCwOPjdAvBbI+e0ocS3MFEvzG6uBQE3xDk3SzynTn
+jh8BCNAw1FtxNrQHusEwMFxIt4I7mKZ9YIqioymCzLq9gwQbooMDQaHWBfEbwrbw
+qHyGO0aoSCqI3Haadr8faqU9GY/rOPNk3sgrDQoo//fb4hVC1CLQJ13hef4Y53CI
+rU7m2Ys6xt0nUW7/vGT1M0NPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNV
+HRMBAf8EBTADAQH/MB0GA1UdDgQWBBR5tFnme7bl5AFzgAiIyBpY9umbbjANBgkq
+hkiG9w0BAQsFAAOCAgEAVR9YqbyyqFDQDLHYGmkgJykIrGF1XIpu+ILlaS/V9lZL
+ubhzEFnTIZd+50xx+7LSYK05qAvqFyFWhfFQDlnrzuBZ6brJFe+GnY+EgPbk6ZGQ
+3BebYhtF8GaV0nxvwuo77x/Py9auJ/GpsMiu/X1+mvoiBOv/2X/qkSsisRcOj/KK
+NFtY2PwByVS5uCbMiogziUwthDyC3+6WVwW6LLv3xLfHTjuCvjHIInNzktHCgKQ5
+ORAzI4JMPJ+GslWYHb4phowim57iaztXOoJwTdwJx4nLCgdNbOhdjsnvzqvHu7Ur
+TkXWStAmzOVyyghqpZXjFaH3pO3JLF+l+/+sKAIuvtd7u+Nxe5AW0wdeRlN8NwdC
+jNPElpzVmbUq4JUagEiuTDkHzsxHpFKVK7q4+63SM1N95R1NbdWhscdCb+ZAJzVc
+oyi3B43njTOQ5yOf+1CceWxG1bQVs5ZufpsMljq4Ui0/1lvh+wjChP4kqKOJ2qxq
+4RgqsahDYVvTH9w7jXbyLeiNdd8XM2w9U/t7y0Ff/9yi0GE44Za4rF2LN9d11TPA
+mRGunUHBcnWEvgJBQl9nJEiU0Zsnvgc/ubhPgXRR4Xq37Z0j4r7g1SgEEzwxA57d
+emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=
+-----END CERTIFICATE-----
diff --git a/Simperium/src/main/res/raw/isrgrootx2.pem b/Simperium/src/main/res/raw/isrgrootx2.pem
new file mode 100644
index 0000000..7d903ed
--- /dev/null
+++ b/Simperium/src/main/res/raw/isrgrootx2.pem
@@ -0,0 +1,14 @@
+-----BEGIN CERTIFICATE-----
+MIICGzCCAaGgAwIBAgIQQdKd0XLq7qeAwSxs6S+HUjAKBggqhkjOPQQDAzBPMQsw
+CQYDVQQGEwJVUzEpMCcGA1UEChMgSW50ZXJuZXQgU2VjdXJpdHkgUmVzZWFyY2gg
+R3JvdXAxFTATBgNVBAMTDElTUkcgUm9vdCBYMjAeFw0yMDA5MDQwMDAwMDBaFw00
+MDA5MTcxNjAwMDBaME8xCzAJBgNVBAYTAlVTMSkwJwYDVQQKEyBJbnRlcm5ldCBT
+ZWN1cml0eSBSZXNlYXJjaCBHcm91cDEVMBMGA1UEAxMMSVNSRyBSb290IFgyMHYw
+EAYHKoZIzj0CAQYFK4EEACIDYgAEzZvVn4CDCuwJSvMWSj5cz3es3mcFDR0HttwW
++1qLFNvicWDEukWVEYmO6gbf9yoWHKS5xcUy4APgHoIYOIvXRdgKam7mAHf7AlF9
+ItgKbppbd9/w+kHsOdx1ymgHDB/qo0IwQDAOBgNVHQ8BAf8EBAMCAQYwDwYDVR0T
+AQH/BAUwAwEB/zAdBgNVHQ4EFgQUfEKWrt5LSDv6kviejM9ti6lyN5UwCgYIKoZI
+zj0EAwMDaAAwZQIwe3lORlCEwkSHRhtFcP9Ymd70/aTSVaYgLXTWNLxBo1BfASdW
+tL4ndQavEi51mI38AjEAi/V3bNTIZargCyzuFJ0nN6T5U6VR5CmD1/iQMVtCnwr1
+/q4AaOeMSQ+2b1tbFfLn
+-----END CERTIFICATE-----