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+# Question
+
+Reagent doesn't work after updating dependencies.
+
+# Answer
+
+If you see problems about accessing `React` or `ReactDOM` object or some React method after you have updated your dependencies,
+Reagent or some other dependency which uses React. Problem is probably that you have `cljsjs/react` or `cljsjs/react-dom`
+version which doesn't work with Reagent, or different version of React and ReactDOM, which don't work together.
+
+To fix this you should check `lein deps :tree` or `boot show -d`, and check which version of Cljsjs React packages you have.
+
+There are three alternative solutions:
+
+1. Update all the packages that require Cljsjs React packages to use same (or compatible) versions as Reagent
+2. Add `:exclusion [cljsjs/react cljsjs/react-dom]` to problematic dependencies, so only Reagent
+will have transitive dependency on React packages
+3. Add direct `cljsjs/react` and `cljsjs/react-dom` dependencies to your project, which will override any transitive dependencies
+
+Note: `cljsjs/react-dom-server` package is deprecated but Reagent still depends on empty package for compatibility.
+
+Note: For more information on how Leiningen and Boot resolve dependencies using Maven-resolver, read: https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html