diff --git a/Dockerfile b/Dockerfile
index 9a0da78..f5121cb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3
+FROM python:3.7
 
 ENV PYTHONUNBUFFERED 1
 ENV SHELL /bin/bash
diff --git a/requirements.txt b/requirements.txt
index 88d075c..e930ba9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Django==2.1.11
-psycopg2-binary==2.8.4
+psycopg2-binary==2.7.7
 dj-database-url==0.5.0
 django-auth-ldap==2.0.0
 django-classy-tags==0.9.0
diff --git a/scripts/exit.py b/scripts/exit.py
index b7ebbb4..584c01d 100755
--- a/scripts/exit.py
+++ b/scripts/exit.py
@@ -20,8 +20,10 @@ def rm_docker_env_file( config ):
         BASE_DIR / ".env"
     )
     print( "removing '{}'".format( path ) )
-    path.unlink()
-
+    shutil.rmtree(
+        path,
+        ignore_errors=True
+    )
 
 if __name__ == '__main__':