diff --git a/_data/chains/eip155-63000.txt b/_data/chains/eip155-63000.json
similarity index 100%
rename from _data/chains/eip155-63000.txt
rename to _data/chains/eip155-63000.json
diff --git a/_data/chains/eip155-63001.txt b/_data/chains/eip155-63001.json
similarity index 100%
rename from _data/chains/eip155-63001.txt
rename to _data/chains/eip155-63001.json