diff --git a/Dockerfile b/Dockerfile
index dd9b9d5..5391343 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,3 @@
-FROM python:3.5-onbuild
+FROM python:3.4-onbuild
 
 ENTRYPOINT ["python", "-m", "soil"]
diff --git a/docs/installation.rst b/docs/installation.rst
index a1fddd4..1daa84d 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -1,7 +1,7 @@
 Installation
 ------------
 
-The easiest way to install Soil is through pip:
+The easiest way to install Soil is through pip, with Python >= 3.4:
 
 .. code:: bash
 
diff --git a/soil/__init__.py b/soil/__init__.py
index fddebb8..7a14b1c 100644
--- a/soil/__init__.py
+++ b/soil/__init__.py
@@ -2,7 +2,7 @@ import importlib
 import sys
 import os
 
-__version__ = "0.9.6"
+__version__ = "0.9.7"
 
 try:
     basestring
diff --git a/soil/environment.py b/soil/environment.py
index 3317cf6..377e084 100644
--- a/soil/environment.py
+++ b/soil/environment.py
@@ -50,8 +50,7 @@ class SoilEnvironment(nxsim.NetworkEnvironment):
             atype = kwargs.pop('agent_type')
             kwargs['agent_id'] = kwargs.get('agent_id', atype.__name__)
             kwargs['state'] = kwargs.get('state', {})
-            a = atype(**kwargs,
-                      environment=self)
+            a = atype(environment=self, **kwargs)
             self._env_agents[a.id] = weakref.ref(a)
 
     @property
@@ -160,7 +159,7 @@ class SoilEnvironment(nxsim.NetworkEnvironment):
             spells = []
             lastvisible = False
             laststep = None
-            for t_step, state in reversed(agent._history.items()):
+            for t_step, state in reversed(list(agent._history.items())):
                 for attribute, value in state.items():
                     if attribute == 'visible':
                         nowvisible = state[attribute]
@@ -183,7 +182,7 @@ class SoilEnvironment(nxsim.NetworkEnvironment):
             if lastvisible:
                 spells.append((laststep, None))
             if spells:
-                G.add_node(agent.id, **attributes, spells=spells)
+                G.add_node(agent.id, spells=spells, **attributes)
             else:
                 G.add_node(agent.id, **attributes)