diff --git a/Cargo.lock b/Cargo.lock
index 69dfef2..bc1102a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -334,7 +334,7 @@ dependencies = [
 
 [[package]]
 name = "proguard"
-version = "5.5.0"
+version = "5.6.1"
 dependencies = [
  "criterion",
  "serde",
diff --git a/src/mapping.rs b/src/mapping.rs
index 27063dd..055a455 100644
--- a/src/mapping.rs
+++ b/src/mapping.rs
@@ -521,7 +521,10 @@ fn parse_r8_header(bytes: &[u8]) -> Result<(ProguardRecord, &[u8]), ParseError>
 
     let (header, rest) = parse_until(bytes, is_newline)?;
 
-    let header = serde_json::from_str(header).unwrap();
+    let header = serde_json::from_str(header).map_err(|_| ParseError {
+        line: bytes,
+        kind: ParseErrorKind::ParseError("invalid r8 header"),
+    })?;
     Ok((
         ProguardRecord::R8Header(header),
         consume_leading_newlines(rest),
@@ -804,6 +807,12 @@ mod tests {
         );
     }
 
+    #[test]
+    fn try_parse_r8_headers_invalid() {
+        let bytes = br#"# {123:"foobar"}"#;
+        assert!(ProguardRecord::try_parse(bytes).is_err(),);
+    }
+
     #[test]
     fn try_parse_r8_headers() {
         let bytes = br#"# {"id":"foobar"}"#;