diff --git a/pkgs/python-packages.nix b/pkgs/python-packages.nix
--- a/pkgs/python-packages.nix
+++ b/pkgs/python-packages.nix
@@ -678,8 +678,6 @@ self: super: {
     doCheck = true;
     propagatedBuildInputs = [
       self."configobj"
-      self."atomicwrites"
-      self."attrs"
       self."dogpile.cache"
       self."dogpile.core"
       self."decorator"
@@ -691,11 +689,8 @@ self: super: {
       self."mercurial"
       self."msgpack-python"
       self."pastedeploy"
-      self."psutil"
       self."pyramid"
       self."pyramid-mako"
-      self."pygments"
-      self."pathlib2"
       self."repoze.lru"
       self."simplejson"
       self."subprocess32"
@@ -705,12 +700,10 @@ self: super: {
       self."webob"
       self."zope.deprecation"
       self."zope.interface"
-      self."venusian"
       self."gevent"
       self."greenlet"
       self."gunicorn"
       self."waitress"
-      self."setproctitle"
       self."ipdb"
       self."ipython"
       self."pytest"
diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,8 +2,7 @@
 
 # our custom configobj
 https://code.rhodecode.com/upstream/configobj/archive/a11ff0a0bd4fbda9e3a91267e720f88329efb4a6.tar.gz?md5=9916c524ea11a6c418217af6b28d4b3c#egg=configobj==5.0.6
-atomicwrites==1.2.1
-attrs==18.2.0
+
 dogpile.cache==0.7.1
 dogpile.core==0.4.1
 decorator==4.1.2
@@ -16,12 +15,9 @@ mercurial==4.6.2
 msgpack-python==0.5.6
 
 pastedeploy==2.0.1
-psutil==5.4.8
 pyramid==1.10.1
 pyramid-mako==1.0.2
 
-pygments==2.3.1
-pathlib2==2.3.3
 repoze.lru==0.7
 simplejson==3.16.0
 subprocess32==3.5.3
@@ -32,14 +28,12 @@ translationstring==1.3
 webob==1.8.4
 zope.deprecation==4.3.0
 zope.interface==4.5.0
-venusian==1.2.0
 
 ## http servers
 gevent==1.4.0
 greenlet==0.4.15
 gunicorn==19.9.0
 waitress==1.1.0
-setproctitle==1.1.10
 
 ## debug
 ipdb==0.11.0
diff --git a/requirements_pinned.txt b/requirements_pinned.txt
new file mode 100644
--- /dev/null
+++ b/requirements_pinned.txt
@@ -0,0 +1,9 @@
+# contains not directly required libraries we want to pin the version.
+
+atomicwrites==1.2.1
+attrs==18.2.0
+pathlib2==2.3.3
+pygments==2.3.1
+psutil==5.4.8
+setproctitle==1.1.10
+venusian==1.2.0