diff --git a/pgpainless-sop/src/main/java/org/pgpainless/sop/KeyReader.java b/pgpainless-sop/src/main/java/org/pgpainless/sop/KeyReader.java
index 59515200..a2876a6e 100644
--- a/pgpainless-sop/src/main/java/org/pgpainless/sop/KeyReader.java
+++ b/pgpainless-sop/src/main/java/org/pgpainless/sop/KeyReader.java
@@ -48,7 +48,8 @@ class KeyReader {
         try {
             certs = PGPainless.readKeyRing().publicKeyRingCollection(certIn);
         } catch (IOException e) {
-            if (e.getMessage() != null && e.getMessage().startsWith("unknown object in stream:")) {
+            String msg = e.getMessage();
+            if (msg != null && (msg.startsWith("unknown object in stream:") || msg.startsWith("invalid header encountered"))) {
                 throw new SOPGPException.BadData(e);
             }
             throw e;
diff --git a/version.gradle b/version.gradle
index 2e0c2c23..532b0a3f 100644
--- a/version.gradle
+++ b/version.gradle
@@ -8,7 +8,7 @@ allprojects {
         isSnapshot = true
         pgpainlessMinAndroidSdk = 10
         javaSourceCompatibility = 1.8
-        bouncyCastleVersion = '1.75'
+        bouncyCastleVersion = '1.76'
         bouncyPgVersion = bouncyCastleVersion
         junitVersion = '5.8.2'
         logbackVersion = '1.2.11'