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diff --git a/doc/contributing/building_ruby.md b/doc/contributing/building_ruby.md
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@@ -6,7 +6,7 @@
* C compiler
* autoconf - 2.67 or later
- * bison - 2.0 or later
+ * bison - 3.0 or later
* gperf - 3.0.3 or later
* ruby - 2.7 or later