diff --git a/README.md b/README.md
index fa9bdbc..b286421 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ TODO - Andrew
 #### Dependencies
 Next, install and activate a virtualenv:
 ```sh
-sudo apt install libkrb5-dev python3-dev
+sudo apt install libkrb5-dev libsasl2-dev python3-dev
 python3 -m venv venv
 . venv/bin/activate
 pip install -r requirements.txt
diff --git a/ceod/model/LDAPService.py b/ceod/model/LDAPService.py
index 2487ac3..53c418d 100644
--- a/ceod/model/LDAPService.py
+++ b/ceod/model/LDAPService.py
@@ -274,4 +274,10 @@ class LDAPService:
             )
         ]
         if dry_run:
-            return user
+            return users_to_change
+
+        for uid, old_program, new_program in users_to_change:
+            changes = {'program': [(ldap3.MODIFY_REPLACE, [new_program])]}
+            conn.modify(self.uid_to_dn(uid), changes)
+
+        return users_to_change