diff --git a/src/events/imagepackevent.cpp b/src/events/imagepackevent.cpp
index 6a909bd21..2fd2977bd 100644
--- a/src/events/imagepackevent.cpp
+++ b/src/events/imagepackevent.cpp
@@ -10,10 +10,10 @@ ImagePackEventContent::ImagePackEventContent(const QJsonObject &json)
 {
     if (json.contains(QStringLiteral("pack"))) {
         pack = ImagePackEventContent::Pack{
-            fromJson<Omittable<QString>>(json["pack"_ls].toObject()["display_name"_ls]),
-            fromJson<Omittable<QUrl>>(json["pack"_ls].toObject()["avatar_url"_ls]),
-            fromJson<Omittable<QStringList>>(json["pack"_ls].toObject()["usage"_ls]),
-            fromJson<Omittable<QString>>(json["pack"_ls].toObject()["attribution"_ls]),
+            fromJson<std::optional<QString>>(json["pack"_ls].toObject()["display_name"_ls]),
+            fromJson<std::optional<QUrl>>(json["pack"_ls].toObject()["avatar_url"_ls]),
+            fromJson<std::optional<QStringList>>(json["pack"_ls].toObject()["usage"_ls]),
+            fromJson<std::optional<QString>>(json["pack"_ls].toObject()["attribution"_ls]),
         };
     } else {
         pack = none;
@@ -21,7 +21,7 @@ ImagePackEventContent::ImagePackEventContent(const QJsonObject &json)
 
     const auto &keys = json["images"_ls].toObject().keys();
     for (const auto &k : keys) {
-        Omittable<EventContent::ImageInfo> info;
+        std::optional<EventContent::ImageInfo> info;
         if (json["images"_ls][k].toObject().contains(QStringLiteral("info"))) {
             info = EventContent::ImageInfo(QUrl(json["images"_ls][k]["url"_ls].toString()), json["images"_ls][k]["info"_ls].toObject(), k);
         } else {
@@ -30,9 +30,9 @@ ImagePackEventContent::ImagePackEventContent(const QJsonObject &json)
         images += ImagePackImage{
             k,
             fromJson<QUrl>(json["images"_ls][k]["url"_ls].toString()),
-            fromJson<Omittable<QString>>(json["images"_ls][k]["body"_ls]),
+            fromJson<std::optional<QString>>(json["images"_ls][k]["body"_ls]),
             info,
-            fromJson<Omittable<QStringList>>(json["images"_ls][k]["usage"_ls]),
+            fromJson<std::optional<QStringList>>(json["images"_ls][k]["usage"_ls]),
         };
     }
 }
diff --git a/src/events/imagepackevent.h b/src/events/imagepackevent.h
index 780d1bcb2..cae4ab189 100644
--- a/src/events/imagepackevent.h
+++ b/src/events/imagepackevent.h
@@ -26,10 +26,10 @@ public:
      * @brief Defines the properties of an image pack.
      */
     struct Pack {
-        Quotient::Omittable<QString> displayName; /**< The display name of the pack. */
-        Quotient::Omittable<QUrl> avatarUrl; /**< The source mxc URL for the pack avatar. */
-        Quotient::Omittable<QStringList> usage; /**< An array of the usages for this pack. Possible usages are "emoticon" and "sticker". */
-        Quotient::Omittable<QString> attribution; /**< The attribution for the pack author(s). */
+        std::optional<QString> displayName; /**< The display name of the pack. */
+        std::optional<QUrl> avatarUrl; /**< The source mxc URL for the pack avatar. */
+        std::optional<QStringList> usage; /**< An array of the usages for this pack. Possible usages are "emoticon" and "sticker". */
+        std::optional<QString> attribution; /**< The attribution for the pack author(s). */
     };
 
     /**
@@ -38,14 +38,14 @@ public:
     struct ImagePackImage {
         QString shortcode; /**< The shortcode for the image. */
         QUrl url; /**< The mxc URL for this image. */
-        Quotient::Omittable<QString> body; /**< An optional text body for this image. */
-        Quotient::Omittable<Quotient::EventContent::ImageInfo> info; /**< The ImageInfo object used for the info block of m.sticker events. */
+        std::optional<QString> body; /**< An optional text body for this image. */
+        std::optional<Quotient::EventContent::ImageInfo> info; /**< The ImageInfo object used for the info block of m.sticker events. */
         /**
          * @brief An array of the usages for this image.
          *
          * The possible values match those of the usage key of a pack object.
          */
-        Quotient::Omittable<QStringList> usage;
+        std::optional<QStringList> usage;
     };
 
     /**
@@ -53,7 +53,7 @@ public:
      *
      * @sa Pack
      */
-    Quotient::Omittable<Pack> pack;
+    std::optional<Pack> pack;
 
     /**
      * @brief Return a vector of images in the pack.
diff --git a/src/jobs/neochatchangepasswordjob.cpp b/src/jobs/neochatchangepasswordjob.cpp
index dec09ef8f..9be9fa7b8 100644
--- a/src/jobs/neochatchangepasswordjob.cpp
+++ b/src/jobs/neochatchangepasswordjob.cpp
@@ -5,7 +5,7 @@
 
 using namespace Quotient;
 
-NeochatChangePasswordJob::NeochatChangePasswordJob(const QString &newPassword, bool logoutDevices, const Omittable<QJsonObject> &auth)
+NeochatChangePasswordJob::NeochatChangePasswordJob(const QString &newPassword, bool logoutDevices, const std::optional<QJsonObject> &auth)
     : BaseJob(HttpVerb::Post, QStringLiteral("ChangePasswordJob"), "/_matrix/client/r0/account/password")
 {
     QJsonObject _data;
diff --git a/src/jobs/neochatchangepasswordjob.h b/src/jobs/neochatchangepasswordjob.h
index ac4d76d25..b890b1375 100644
--- a/src/jobs/neochatchangepasswordjob.h
+++ b/src/jobs/neochatchangepasswordjob.h
@@ -4,10 +4,9 @@
 #pragma once
 
 #include <Quotient/jobs/basejob.h>
-#include <Quotient/omittable.h>
 
 class NeochatChangePasswordJob : public Quotient::BaseJob
 {
 public:
-    explicit NeochatChangePasswordJob(const QString &newPassword, bool logoutDevices, const Quotient::Omittable<QJsonObject> &auth = Quotient::none);
+    explicit NeochatChangePasswordJob(const QString &newPassword, bool logoutDevices, const std::optional<QJsonObject> &auth = std::nullopt);
 };
diff --git a/src/jobs/neochatdeactivateaccountjob.cpp b/src/jobs/neochatdeactivateaccountjob.cpp
index 398a7df72..081e2ed8f 100644
--- a/src/jobs/neochatdeactivateaccountjob.cpp
+++ b/src/jobs/neochatdeactivateaccountjob.cpp
@@ -5,7 +5,7 @@
 
 using namespace Quotient;
 
-NeoChatDeactivateAccountJob::NeoChatDeactivateAccountJob(const Omittable<QJsonObject> &auth)
+NeoChatDeactivateAccountJob::NeoChatDeactivateAccountJob(const std::optional<QJsonObject> &auth)
     : BaseJob(HttpVerb::Post, QStringLiteral("DisableDeviceJob"), "_matrix/client/v3/account/deactivate")
 {
     QJsonObject data;
diff --git a/src/jobs/neochatdeactivateaccountjob.h b/src/jobs/neochatdeactivateaccountjob.h
index ff2e9f4ec..a0140f813 100644
--- a/src/jobs/neochatdeactivateaccountjob.h
+++ b/src/jobs/neochatdeactivateaccountjob.h
@@ -4,10 +4,9 @@
 #pragma once
 
 #include <Quotient/jobs/basejob.h>
-#include <Quotient/omittable.h>
 
 class NeoChatDeactivateAccountJob : public Quotient::BaseJob
 {
 public:
-    explicit NeoChatDeactivateAccountJob(const Quotient::Omittable<QJsonObject> &auth = Quotient::none);
+    explicit NeoChatDeactivateAccountJob(const std::optional<QJsonObject> &auth = std::nullopt);
 };
diff --git a/src/jobs/neochatdeletedevicejob.cpp b/src/jobs/neochatdeletedevicejob.cpp
index 0283d41f2..08771cc08 100644
--- a/src/jobs/neochatdeletedevicejob.cpp
+++ b/src/jobs/neochatdeletedevicejob.cpp
@@ -5,7 +5,7 @@
 
 using namespace Quotient;
 
-NeochatDeleteDeviceJob::NeochatDeleteDeviceJob(const QString &deviceId, const Omittable<QJsonObject> &auth)
+NeochatDeleteDeviceJob::NeochatDeleteDeviceJob(const QString &deviceId, const std::optional<QJsonObject> &auth)
     : BaseJob(HttpVerb::Delete, QStringLiteral("DeleteDeviceJob"), QStringLiteral("/_matrix/client/r0/devices/%1").arg(deviceId).toLatin1())
 {
     QJsonObject _data;
diff --git a/src/jobs/neochatdeletedevicejob.h b/src/jobs/neochatdeletedevicejob.h
index 9b9e72e07..2eed9496e 100644
--- a/src/jobs/neochatdeletedevicejob.h
+++ b/src/jobs/neochatdeletedevicejob.h
@@ -4,10 +4,9 @@
 #pragma once
 
 #include <Quotient/jobs/basejob.h>
-#include <Quotient/omittable.h>
 
 class NeochatDeleteDeviceJob : public Quotient::BaseJob
 {
 public:
-    explicit NeochatDeleteDeviceJob(const QString &deviceId, const Quotient::Omittable<QJsonObject> &auth = Quotient::none);
+    explicit NeochatDeleteDeviceJob(const QString &deviceId, const std::optional<QJsonObject> &auth = std::nullopt);
 };
diff --git a/src/models/spacechildrenmodel.cpp b/src/models/spacechildrenmodel.cpp
index d5e5df5cb..1ce120336 100644
--- a/src/models/spacechildrenmodel.cpp
+++ b/src/models/spacechildrenmodel.cpp
@@ -87,7 +87,7 @@ void SpaceChildrenModel::refreshModel()
     m_rootItem =
         new SpaceTreeItem(dynamic_cast<NeoChatConnection *>(m_space->connection()), nullptr, m_space->id(), m_space->displayName(), m_space->canonicalAlias());
     endResetModel();
-    auto job = m_space->connection()->callApi<Quotient::GetSpaceHierarchyJob>(m_space->id(), Quotient::none, Quotient::none, 1);
+    auto job = m_space->connection()->callApi<Quotient::GetSpaceHierarchyJob>(m_space->id(), std::nullopt, std::nullopt, 1);
     m_currentJobs.append(job);
     connect(job, &Quotient::BaseJob::success, this, [this, job]() {
         insertChildren(job->rooms());
@@ -136,7 +136,7 @@ void SpaceChildrenModel::insertChildren(std::vector<Quotient::GetSpaceHierarchyJ
                 }
             }
             if (children[i].childrenState.size() > 0) {
-                auto job = m_space->connection()->callApi<Quotient::GetSpaceHierarchyJob>(children[i].roomId, Quotient::none, Quotient::none, 1);
+                auto job = m_space->connection()->callApi<Quotient::GetSpaceHierarchyJob>(children[i].roomId, std::nullopt, std::nullopt, 1);
                 m_currentJobs.append(job);
                 connect(job, &Quotient::BaseJob::success, this, [this, parent, insertRow, job]() {
                     insertChildren(job->rooms(), index(insertRow, 0, parent));
diff --git a/src/registration.cpp b/src/registration.cpp
index e20d44d26..11303cf9f 100644
--- a/src/registration.cpp
+++ b/src/registration.cpp
@@ -63,7 +63,7 @@ QString Registration::recaptchaSiteKey() const
 void Registration::registerAccount()
 {
     setStatus(Working);
-    Omittable<QJsonObject> authData = none;
+    std::optional<QJsonObject> authData = none;
     if (nextStep() == "m.login.recaptcha"_ls) {
         authData = QJsonObject{
             {"type"_ls, "m.login.recaptcha"_ls},
@@ -244,12 +244,12 @@ void Registration::setPassword(const QString &password)
 }
 
 NeoChatRegisterJob::NeoChatRegisterJob(const QString &kind,
-                                       const Omittable<QJsonObject> &auth,
+                                       const std::optional<QJsonObject> &auth,
                                        const QString &username,
                                        const QString &password,
                                        const QString &deviceId,
                                        const QString &initialDeviceDisplayName,
-                                       Omittable<bool> inhibitLogin)
+                                       std::optional<bool> inhibitLogin)
     : BaseJob(HttpVerb::Post, "RegisterJob"_ls, QByteArrayLiteral("/_matrix/client/r0/register"), false)
 {
     QJsonObject _data;
diff --git a/src/registration.h b/src/registration.h
index aea7bbd44..f0053968e 100644
--- a/src/registration.h
+++ b/src/registration.h
@@ -27,12 +27,12 @@ class NeoChatRegisterJob : public Quotient::BaseJob
 {
 public:
     explicit NeoChatRegisterJob(const QString &kind = QStringLiteral("user"),
-                                const Quotient::Omittable<QJsonObject> &auth = Quotient::none,
+                                const std::optional<QJsonObject> &auth = std::nullopt,
                                 const QString &username = {},
                                 const QString &password = {},
                                 const QString &deviceId = {},
                                 const QString &initialDeviceDisplayName = {},
-                                Quotient::Omittable<bool> inhibitLogin = Quotient::none);
+                                std::optional<bool> inhibitLogin = std::nullopt);
 
     QString userId() const
     {