diff --git a/gh-token b/gh-token
index e1c8321..b98e893 100755
--- a/gh-token
+++ b/gh-token
@@ -1,4 +1,10 @@
 #!/usr/bin/env bash
+
+if (( ${BASH_VERSION%%.*} < 5 )); then
+  echo "Bash is too old: ${BASH_VERSION}; Bash 5.+ is required"
+  exit 1
+fi
+
 ###############################################################################
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