diff --git a/packages/hxtorch/package.py b/packages/hxtorch/package.py
index 85fdcbe16001ee12ffce5cf05658d1976f56b1af..63c3e5cc9a74d8f54c39b374c94787965bee194b 100644
--- a/packages/hxtorch/package.py
+++ b/packages/hxtorch/package.py
@@ -19,11 +19,13 @@ class Hxtorch(WafPackage):
 
     maintainers = ['emuller']
 
+    version('7.0-rc1-fixup3', tag='hxtorch-7.0-rc1-fixup3')
     version('7.0-rc1-fixup2', tag='hxtorch-7.0-rc1-fixup2')
     version('7.0-rc1-fixup1', branch='waf')
 
     # compiler for the BrainScaleS-2 embedded processor ("PPU"); needed for
     # building/linking, at runtime and for testing
+    depends_on('oppulance@7.0-rc1-fixup3', when='@7.0-rc1-fixup3', type=('build', 'link', 'run', 'test'))
     depends_on('oppulance@7.0-rc1-fixup2', when='@7.0-rc1-fixup2', type=('build', 'link', 'run', 'test'))
     depends_on('oppulance@7.0-rc1-fixup1', when='@7.0-rc1-fixup1', type=('build', 'link', 'run', 'test'))
 
@@ -78,8 +80,8 @@ class Hxtorch(WafPackage):
             return
 
         with working_dir(self.stage.source_path):
-            waf = which('./waf')
-            waf('setup', '--repo-db-url=https://github.com/electronicvisions/projects',
+            python = which('python3')
+            python('./waf', 'setup', '--repo-db-url=https://github.com/electronicvisions/projects',
                 '--clone-depth=2',
                 '--without-munge',
                 '--without-hxcomm-hostarq',
diff --git a/packages/oppulance/package.py b/packages/oppulance/package.py
index a12fac91a194d62cc3b3636f54b86fe739fb95ce..c6e2021bf050bff4c6f2fd0f1bbe95d559bbf753 100644
--- a/packages/oppulance/package.py
+++ b/packages/oppulance/package.py
@@ -21,6 +21,10 @@ class Oppulance(Package):
     depends_on('gmp')
 
     releases = [
+        {
+            'version': '7.0-rc1-fixup3',
+            'tag': 'ebrains-7.0-rc1-fixup3'
+        },
         {
             'version': '7.0-rc1-fixup2',
             'tag': 'ebrains-7.0-rc1-fixup2'
diff --git a/packages/pynn-brainscales/package.py b/packages/pynn-brainscales/package.py
index c715d46d1e310c7b338dbbbf71d37d09379964ff..4b088549071851ddd8685e399bbb4f3cd784db08 100644
--- a/packages/pynn-brainscales/package.py
+++ b/packages/pynn-brainscales/package.py
@@ -19,11 +19,13 @@ class PynnBrainscales(WafPackage):
 
     maintainers = ['emuller']
     
+    version('7.0-rc1-fixup3', tag='pynn-brainscales-7.0-rc1-fixup3')
     version('7.0-rc1-fixup2', tag='pynn-brainscales-7.0-rc1-fixup2')
     version('7.0-rc1-fixup1', branch='waf')
 
     # compiler for the BrainScaleS-2 embedded processor ("PPU"); needed for
     # building/linking, at runtime and for testing
+    depends_on('oppulance@7.0-rc1-fixup3', when='@7.0-rc1-fixup3', type=('build', 'link', 'run', 'test'))
     depends_on('oppulance@7.0-rc1-fixup2', when='@7.0-rc1-fixup2', type=('build', 'link', 'run', 'test'))
     depends_on('oppulance@7.0-rc1-fixup1', when='@7.0-rc1-fixup1', type=('build', 'link', 'run', 'test'))
 
@@ -75,8 +77,8 @@ class PynnBrainscales(WafPackage):
             return
 
         with working_dir(self.stage.source_path):
-            waf = which('./waf')
-            waf('setup', '--repo-db-url=https://github.com/electronicvisions/projects',
+            python = which('python3')
+            python('./waf', 'setup', '--repo-db-url=https://github.com/electronicvisions/projects',
                 '--clone-depth=2',
                 '--without-munge',
                 '--without-hxcomm-hostarq',
diff --git a/packages/wf-brainscales2-demos/package.py b/packages/wf-brainscales2-demos/package.py
index f54ebef167c8e2ee55c19ad27a214e726b93b78a..914fa180f7c3828d4c238b191d40d9f100f2ffe9 100644
--- a/packages/wf-brainscales2-demos/package.py
+++ b/packages/wf-brainscales2-demos/package.py
@@ -17,6 +17,7 @@ class WfBrainscales2Demos(Package):
     maintainer = ["muffgaga"]
 
     # ECM: we probably should build the ipynb file in this package
+    version("7.0-rc1-fixup3", tag="jupyter-notebooks-7.0-rc1-fixup3")
     version("23.6", branch="jupyter-notebooks-experimental")
 
     depends_on('hxtorch', type=("run", "test"))