diff --git a/cryptoutil/cryptoutil_test.go b/cryptoutil/cryptoutil_test.go
new file mode 100644
index 0000000..0c3eda3
--- /dev/null
+++ b/cryptoutil/cryptoutil_test.go
@@ -0,0 +1,20 @@
+package cryptoutil
+
+import (
+	"encoding/base64"
+	"testing"
+
+	"go.mozilla.org/pkcs7"
+)
+
+func TestPKCS7ParseTagLengthError(t *testing.T) {
+	// Regression test: Older versions of the library might return this BER tag length error.
+	mdmSignatureHeader := "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"
+	p7signature, _ := base64.StdEncoding.DecodeString(mdmSignatureHeader)
+
+	_, err := pkcs7.Parse(p7signature)
+
+	if err != nil {
+		t.Error("pkcs7.Parse() failed with error:", err)
+	}
+}
diff --git a/go.mod b/go.mod
index bd2a7dd..d9a5609 100644
--- a/go.mod
+++ b/go.mod
@@ -6,5 +6,5 @@ require (
 	github.com/RobotsAndPencils/buford v0.14.0
 	github.com/go-sql-driver/mysql v1.6.0
 	github.com/groob/plist v0.0.0-20210519001750-9f754062e6d6
-	go.mozilla.org/pkcs7 v0.0.0-20210730143726-725912489c62
+	go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352
 )
diff --git a/go.sum b/go.sum
index 5ee9e7c..d489a9f 100644
--- a/go.sum
+++ b/go.sum
@@ -8,6 +8,8 @@ github.com/groob/plist v0.0.0-20210519001750-9f754062e6d6 h1:RyfUvLxQ4XCqPzRlNc0
 github.com/groob/plist v0.0.0-20210519001750-9f754062e6d6/go.mod h1:itkABA+w2cw7x5nYUS/pLRef6ludkZKOigbROmCTaFw=
 go.mozilla.org/pkcs7 v0.0.0-20210730143726-725912489c62 h1:WyR8exjHM07a8uwgpBCY83RID3Tcg/HKZuU82/bTWOE=
 go.mozilla.org/pkcs7 v0.0.0-20210730143726-725912489c62/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
+go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352 h1:CCriYyAfq1Br1aIYettdHZTy8mBTIPo7We18TuO/bak=
+go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 h1:ObdrDkeb4kJdCP557AjRjq69pTHfNouLtWZG7j9rPN8=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=