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diff --git a/README b/README
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 * Supported scheme implementations
 
-    - Guile 1.9.5 or better.
-    - PLT Scheme 4.1.5.5 or better.
+    - Guile 1.9.9 or better.
+    - PLT Scheme 4.2 or better.
 
 * Installation
   Geiser can be used either directly from its uninstalled source tree