diff --git a/package/source/manifest/ManifestImport.cxx b/package/source/manifest/ManifestImport.cxx
index 0218ac07a5d2..77f795efdc59 100644
--- a/package/source/manifest/ManifestImport.cxx
+++ b/package/source/manifest/ManifestImport.cxx
@@ -327,6 +327,7 @@ void SAL_CALL ManifestImport::startElement( const OUString& aName, const uno::Re
 
     switch (nLevel) {
     case 1: {
+        m_PackageVersion = aConvertedAttribs[ATTRIBUTE_VERSION];
         if (aConvertedName != ELEMENT_MANIFEST) //manifest:manifest
             aStack.back().m_bValid = false;
         break;
@@ -451,6 +452,18 @@ void SAL_CALL ManifestImport::endElement( const OUString& aName )
         return;
 
     if ( aConvertedName == ELEMENT_FILE_ENTRY && aStack.back().m_bValid ) {
+        // required for wholesome encryption: if there is no document and hence
+        // no file-entry with a version attribute, send the package's version
+        // with the first file-entry.
+        // (note: the only case when a valid ODF document has no "/" entry with
+        // a version is when it is ODF 1.0/1.1 and then it doesn't have the
+        // package version either)
+        if (rManVector.empty() && !m_PackageVersion.isEmpty()
+            && !aSequence[PKG_MNFST_VERSION].Value.hasValue())
+        {
+            aSequence[PKG_MNFST_VERSION].Name = u"Version"_ustr;
+            aSequence[PKG_MNFST_VERSION].Value <<= m_PackageVersion;
+        }
         // the first entry gets KeyInfo element if any, for PGP encryption
         if (!bIgnoreEncryptData && !aKeys.empty() && rManVector.empty())
         {
diff --git a/package/source/manifest/ManifestImport.hxx b/package/source/manifest/ManifestImport.hxx
index fd86e02e4f5a..883f1de62387 100644
--- a/package/source/manifest/ManifestImport.hxx
+++ b/package/source/manifest/ManifestImport.hxx
@@ -61,6 +61,7 @@ class ManifestImport final : public cppu::WeakImplHelper < css::xml::sax::XDocum
     bool bPgpEncryption;
     sal_Int32 nDerivedKeySize;
     ::std::vector < css::uno::Sequence < css::beans::PropertyValue > > & rManVector;
+    OUString m_PackageVersion; // on root element
 
 
     OUString PushNameAndNamespaces( const OUString& aName,
diff --git a/package/source/zippackage/ZipPackage.cxx b/package/source/zippackage/ZipPackage.cxx
index 02f7cf71e8af..c4de219f80de 100644
--- a/package/source/zippackage/ZipPackage.cxx
+++ b/package/source/zippackage/ZipPackage.cxx
@@ -171,6 +171,7 @@ void ZipPackage::parseManifest()
         return;
 
     bool bManifestParsed = false;
+    ::std::optional<OUString> oFirstVersion;
     static constexpr OUString sMeta (u"META-INF"_ustr);
     if ( m_xRootFolder->hasByName( sMeta ) )
     {
@@ -216,7 +217,13 @@ void ZipPackage::parseManifest()
                             if ( rValue.Name == sPropFullPath )
                                 rValue.Value >>= sPath;
                             else if ( rValue.Name == sPropVersion )
+                            {
                                 rValue.Value >>= sVersion;
+                                if (!oFirstVersion)
+                                {
+                                    oFirstVersion.emplace(sVersion);
+                                }
+                            }
                             else if ( rValue.Name == sPropMediaType )
                                 rValue.Value >>= sMediaType;
                             else if ( rValue.Name == sPropSalt )
@@ -457,6 +464,11 @@ void ZipPackage::parseManifest()
             {
                 // accept only types that look similar to own mediatypes
                 m_xRootFolder->SetMediaType( aPackageMediatype );
+                // also set version explicitly
+                if (oFirstVersion && m_xRootFolder->GetVersion().isEmpty())
+                {
+                    m_xRootFolder->SetVersion(*oFirstVersion);
+                }
                 // if there is an encrypted inner package, there is no root
                 // document, because instead there is a package, and it is not
                 // an error