diff --git a/mob.ini b/mob.ini
index ce5bed2..f45997e 100644
--- a/mob.ini
+++ b/mob.ini
@@ -88,7 +88,7 @@ pull      = true
 boost   = true
 lz4     = true
 openssl = true
-pyqt    = true
+pyqt    = false
 python  = true
 
 [versions]
@@ -106,15 +106,15 @@ libloot        = 0.23.0
 lz4            = v1.9.4
 nmm            = 0.71.2
 openssl        = 3.3.0
-pyqt           = 6.7.0
-pyqt_builder   = 1.16.2
-pyqt_sip       = 13.7.0
+pyqt           = 6.7.1.dev2407071716
+pyqt_builder   = 1.16.4.dev2+g2802761
+pyqt_sip       = 13.8.0
 python         = v3.12.3
 pybind11       = v2.12.0
 bzip2          = 1.0.8
-sip            = 6.8.3
+sip            = 6.8.6.dev4+gf624736c
 spdlog         = v1.14.1
-qt             = 6.7.0
+qt             = 6.7.1
 qt_vs          = 2019
 zlib           = v1.3.1
 libbsarch      = 0.0.12
diff --git a/src/tasks/pyqt.cpp b/src/tasks/pyqt.cpp
index d27d592..ff44364 100644
--- a/src/tasks/pyqt.cpp
+++ b/src/tasks/pyqt.cpp
@@ -173,7 +173,8 @@ namespace mob::tasks {
     void pyqt::build_and_install_from_source()
     {
         // use pip to install the pyqt builder
-        if (python::build_type() == config::debug) {
+        if (python::build_type() == config::debug ||
+            builder_version().find("dev") != std::string::npos) {
             // PyQt-builder has sip as a dependency, so installing it directly will
             // replace the sip we have installed manually, but the installed sip will
             // not work (see comment in sip::build() for details)
@@ -184,6 +185,7 @@ namespace mob::tasks {
             run_tool(pip(pip::install).package("packaging"));
             run_tool(pip(pip::install)
                          .package("PyQt-builder")
+                         .index("https://www.riverbankcomputing.com/pypi/simple")
                          .no_dependencies()
                          .version(builder_version()));
         }
diff --git a/src/tasks/sip.cpp b/src/tasks/sip.cpp
index aed6e34..45457c3 100644
--- a/src/tasks/sip.cpp
+++ b/src/tasks/sip.cpp
@@ -116,7 +116,10 @@ namespace mob::tasks {
         }
         else {
             // download
-            run_tool(pip(pip::download).package("sip").version(version()));
+            run_tool(pip(pip::download)
+                         .package("sip")
+                         .index("https://www.riverbankcomputing.com/pypi/simple")
+                         .version(version()));
         }
 
         // extract
diff --git a/src/tools/python.cpp b/src/tools/python.cpp
index 46c79bc..feca5c2 100644
--- a/src/tools/python.cpp
+++ b/src/tools/python.cpp
@@ -69,6 +69,12 @@ namespace mob {
         return *this;
     }
 
+    pip& pip::index(const std::string& s)
+    {
+        index_ = s;
+        return *this;
+    }
+
     pip& pip::no_dependencies()
     {
         no_deps_ = true;
@@ -147,6 +153,10 @@ namespace mob {
                      .arg("--no-warn-script-location")
                      .arg("--disable-pip-version-check");
 
+        if (!index_.empty()) {
+            p.arg("-i", index_).arg("--extra-index-url", "https://pypi.org/simple")
+        }
+
         if (!package_.empty()) {
             if (version_.empty()) {
                 p.arg(package_);
@@ -169,19 +179,26 @@ namespace mob {
 
     void pip::do_download()
     {
-        execute_and_join(process()
-                             .binary(tasks::python::python_exe())
-                             .chcp(65001)
-                             .stdout_encoding(encodings::utf8)
-                             .stderr_encoding(encodings::utf8)
-                             .arg("-X", "utf8")
-                             .arg("-m", "pip")
-                             .arg("download")
-                             .arg("--no-binary=:all:")
-                             .arg("--no-deps")
-                             .arg("-d", conf().path().cache())
-                             .arg(package_ + "==" + version_)
-                             .env(this_env::get().set("PYTHONUTF8", "1")));
+        auto p = process()
+                     .binary(tasks::python::python_exe())
+                     .chcp(65001)
+                     .stdout_encoding(encodings::utf8)
+                     .stderr_encoding(encodings::utf8)
+                     .arg("-X", "utf8")
+                     .arg("-m", "pip")
+                     .arg("download");
+
+        if (!index_.empty()) {
+            p.arg("-i", index_).arg("--extra-index-url", "https://pypi.org/simple")
+        }
+
+        p.arg("--no-binary=:all:")
+            .arg("--no-deps")
+            .arg("-d", conf().path().cache())
+            .arg(package_ + "==" + version_)
+            .env(this_env::get().set("PYTHONUTF8", "1"));
+
+        execute_and_join(p);
     }
 
 }  // namespace mob
diff --git a/src/tools/tools.h b/src/tools/tools.h
index 3d16fef..0269ebf 100644
--- a/src/tools/tools.h
+++ b/src/tools/tools.h
@@ -702,6 +702,7 @@ namespace mob {
         pip& package(const std::string& s);
         pip& version(const std::string& s);
         pip& file(const fs::path& p);
+        pip& index(const std::string& s);
 
         // do not install dependencies for the package
         //
@@ -720,6 +721,7 @@ namespace mob {
         std::string package_;
         std::string version_;
         fs::path file_;
+        std::string index_;
 
         // no depndencies
         bool no_deps_;