diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 882cece..9bb2e75 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -1,6 +1,6 @@
 
 - [ ] All declared geometries are `geometry(Geometry, 4326)` for general geoms, or `geometry(Point, 4326)`
-- [ ] Include python is activated for new functions. Include this before importing modules: `plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_activate_py()')`
+- [ ] Existing functions in crankshaft python library called from the extension are kept at least from version N to version N+1 (to avoid breakage during upgrades).
 - [ ] Docs for public-facing functions are written
 - [ ] New functions follow the naming conventions: `CDB_NameOfFunction`. Where internal functions begin with an underscore `_`.
 - [ ] If appropriate, new functions accepts an arbitrary query as an input (see [Crankshaft Issue #6](https://github.com/CartoDB/crankshaft/issues/6) for more information)
diff --git a/src/pg/sql/02_py.sql b/src/pg/sql/02_py.sql
deleted file mode 100644
index 7da5f47..0000000
--- a/src/pg/sql/02_py.sql
+++ /dev/null
@@ -1,23 +0,0 @@
-CREATE OR REPLACE FUNCTION _cdb_crankshaft_virtualenvs_path()
-RETURNS text
-AS $$
-  BEGIN
-    -- RETURN '/opt/virtualenvs/crankshaft';
-    RETURN '@@VIRTUALENV_PATH@@';
-  END;
-$$ language plpgsql IMMUTABLE STRICT;
-
--- Use the crankshaft python module
-CREATE OR REPLACE FUNCTION _cdb_crankshaft_activate_py()
-RETURNS VOID
-AS $$
-    import os
-    # plpy.notice('%',str(os.environ))
-    # activate virtualenv
-    crankshaft_version = plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_internal_version()')[0]['_cdb_crankshaft_internal_version']
-    base_path = plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_virtualenvs_path()')[0]['_cdb_crankshaft_virtualenvs_path']
-    default_venv_path = os.path.join(base_path, crankshaft_version)
-    venv_path =  os.environ.get('CRANKSHAFT_VENV', default_venv_path)
-    activate_path = venv_path + '/bin/activate_this.py'
-    exec(open(activate_path).read(), dict(__file__=activate_path))
-$$ LANGUAGE plpythonu;
diff --git a/src/pg/sql/03_random_seeds.sql b/src/pg/sql/03_random_seeds.sql
index 9a0cca6..2b62be3 100644
--- a/src/pg/sql/03_random_seeds.sql
+++ b/src/pg/sql/03_random_seeds.sql
@@ -4,7 +4,6 @@
 CREATE OR REPLACE FUNCTION
 _cdb_random_seeds (seed_value INTEGER) RETURNS VOID
 AS $$
-  plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_activate_py()')
   from crankshaft import random_seeds
   random_seeds.set_random_seeds(seed_value)
 $$ LANGUAGE plpythonu;
diff --git a/src/pg/sql/10_moran.sql b/src/pg/sql/10_moran.sql
index a336867..3be31a2 100644
--- a/src/pg/sql/10_moran.sql
+++ b/src/pg/sql/10_moran.sql
@@ -10,7 +10,6 @@ CREATE OR REPLACE FUNCTION
       id_col TEXT DEFAULT 'cartodb_id')
 RETURNS TABLE (moran NUMERIC, significance NUMERIC)
 AS $$
-  plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_activate_py()')
   from crankshaft.clustering import moran_local
   # TODO: use named parameters or a dictionary
   return moran(subquery, column_name, w_type, num_ngbrs, permutations, geom_col, id_col)
@@ -28,7 +27,6 @@ CREATE OR REPLACE FUNCTION
       id_col TEXT)
 RETURNS TABLE (moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
 AS $$
-  plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_activate_py()')
   from crankshaft.clustering import moran_local
   # TODO: use named parameters or a dictionary
   return moran_local(subquery, column_name, w_type, num_ngbrs, permutations, geom_col, id_col)
@@ -122,7 +120,6 @@ CREATE OR REPLACE FUNCTION
       id_col TEXT DEFAULT 'cartodb_id')
 RETURNS TABLE (moran FLOAT, significance FLOAT)
 AS $$
-  plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_activate_py()')
   from crankshaft.clustering import moran_local
   # TODO: use named parameters or a dictionary
   return moran_rate(subquery, numerator, denominator, w_type, num_ngbrs, permutations, geom_col, id_col)
@@ -143,7 +140,6 @@ CREATE OR REPLACE FUNCTION
 RETURNS
 TABLE(moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
 AS $$
-  plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_activate_py()')
   from crankshaft.clustering import moran_local_rate
   # TODO: use named parameters or a dictionary
   return moran_local_rate(subquery, numerator, denominator, w_type, num_ngbrs, permutations, geom_col, id_col)