diff --git a/server/src/main/java/org/prlprg/session/GNURSession.java b/server/src/main/java/org/prlprg/session/GNURSession.java
index 90042ef5..4989e80d 100644
--- a/server/src/main/java/org/prlprg/session/GNURSession.java
+++ b/server/src/main/java/org/prlprg/session/GNURSession.java
@@ -118,10 +118,12 @@ public void loadPackage(String name, String version) {
     DESCRIPTION description = getDescription(name);
 
     String installedVersion = description.getVersion();
-    //    if (!version.equals(installedVersion)) {
-    //      throw new RuntimeException(
-    //          "Version mismatch: expected " + version + " but found " + installedVersion);
-    //    }
+
+    // TODO: Handle that better that throwing an error.
+    if (!version.equals(installedVersion)) {
+      throw new RuntimeException(
+          "Version mismatch: expected " + version + " but found " + installedVersion);
+    }
 
     // Use suggests and imports as needed
     var suggests = description.getSuggests();