diff --git a/bzt/cli.py b/bzt/cli.py
index 72c158b53b..67462855e1 100755
--- a/bzt/cli.py
+++ b/bzt/cli.py
@@ -286,7 +286,7 @@ def perform(self, configs):
 
         if self.options.verbose:
             modules = sys.modules.copy()
-            for module_name in modules:
+            for module_name in list(modules):
                 version = str(getattr(modules[module_name], '__version__', ""))
                 file = getattr(modules[module_name], '__file__', "")
                 if version:
diff --git a/site/dat/docs/changes/fix-update-cli.change b/site/dat/docs/changes/fix-update-cli.change
new file mode 100644
index 0000000000..81940c524f
--- /dev/null
+++ b/site/dat/docs/changes/fix-update-cli.change
@@ -0,0 +1 @@
+Fix cli.py update. loop/dictionary errors