diff --git a/README.md b/README.md
index e5edce8..c717d9f 100755
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ If you use the instances, we additionally request that you cite the original sou
 
 ```text
 UnitCommitment.jl: A Julia/JuMP Optimization Package for Security-Constrained Unit Commitment
-Copyright © 2020, UChicago Argonne, LLC. All Rights Reserved.
+Copyright © 2020-2021, UChicago Argonne, LLC. All Rights Reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are permitted
 provided that the following conditions are met: