diff --git a/.travis.yml b/.travis.yml
index 1875ccb..817de18 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 before_install:
   - sudo apt-get install -q postgresql-server-dev-9.3
   - sudo apt-get install -q postgresql-9.3-postgis-2.1
-  - dpkg -l | grep postgresql
+  - sudo apt-get purge postgresql-9.1 postgresql-9.2
   - # Install schema_triggers
   - hg clone https://bitbucket.org/malloclabs/pg_schema_triggers &&
     cd pg_schema_triggers && make && sudo make install && cd -