diff --git a/justfile b/justfile
index 82340a8650819..131d24a076df0 100644
--- a/justfile
+++ b/justfile
@@ -21,3 +21,17 @@ toc:
 latest-versions:
   ./ops/scripts/latest-versions.sh
 
+# Usage:
+#   just update-op-geth 2f0528b
+#   just update-op-geth v1.101602.4
+#   just update-op-geth optimism
+update-op-geth ref:
+	@ref="{{ref}}"; \
+	if [ -z "$ref" ]; then echo "error: provide a hash/tag/branch"; exit 1; fi; \
+	tmpl=$(printf "\173\173.Version\175\175"); \
+	ver=$(go list -m -f "$tmpl" github.com/ethereum-optimism/op-geth@"$ref"); \
+	if [ -z "$ver" ]; then echo "error: couldn't resolve $ref"; exit 1; fi; \
+	go mod edit -replace=github.com/ethereum/go-ethereum=github.com/ethereum-optimism/op-geth@"$ver"; \
+	go mod tidy; \
+	echo "Updated op-geth to $ver"
+