diff --git a/op-zora-mainnet.yml b/op-zora-mainnet.yml
index 7e86774a..989b367f 100644
--- a/op-zora-mainnet.yml
+++ b/op-zora-mainnet.yml
@@ -3,7 +3,11 @@ version: '3.1'
 services:
   op-zora-mainnet: # this is Optimism's geth client
     #image: stakesquid/op-zora-mainnet:v0.1
-    build: ./op
+    build:
+      context: ./op
+      args:
+        OP_VERSION: v1.3.1
+        GETH_VERSION: v1.101304.1
     expose:
       - 8545       # RPC / Websocket      
       - 2483     # P2P TCP (currently unused)
@@ -42,7 +46,11 @@ services:
       
   op-zora-mainnet-node:
     #image: stakesquid/op-zora-mainnet:v0.1
-    build: ./op
+    build:
+      context: ./op
+      args:
+        OP_VERSION: v1.3.1
+        GETH_VERSION: v1.101304.1
     depends_on:
       - op-zora-mainnet
     expose:
diff --git a/op/Dockerfile b/op/Dockerfile
index 728b3cfc..233b6274 100644
--- a/op/Dockerfile
+++ b/op/Dockerfile
@@ -2,13 +2,13 @@ FROM golang:1.21 as op
 
 WORKDIR /app
 
-ENV REPO=https://github.com/ethereum-optimism/optimism.git
-ENV VERSION=v1.7.1
+ARG OP_REPO=https://github.com/ethereum-optimism/optimism.git
+ARG OP_VERSION=v1.7.1
 # for verification:
 
 
-RUN git clone $REPO --branch op-node/$VERSION --single-branch . && \
-    git switch -c branch-$VERSION
+RUN git clone $OP_REPO --branch op-node/$OP_VERSION --single-branch . && \
+    git switch -c branch-$OP_VERSION
 
 
 RUN cd op-node && \
@@ -18,12 +18,12 @@ FROM golang:1.21 as geth
 
 WORKDIR /app
 
-ENV REPO=https://github.com/ethereum-optimism/op-geth.git
-ENV VERSION=v1.101308.2
+ARG GETH_REPO=https://github.com/ethereum-optimism/op-geth.git
+ARG GETH_VERSION=v1.101308.2
 
 # avoid depth=1, so the geth build can read tags
-RUN git clone $REPO --branch $VERSION --single-branch . && \
-    git switch -c branch-$VERSION
+RUN git clone $GETH_REPO --branch $GETH_VERSION --single-branch . && \
+    git switch -c branch-$GETH_VERSION
 
 RUN go run build/ci.go install -static ./cmd/geth
 
diff --git a/reference-rpc-endpoint.json b/reference-rpc-endpoint.json
index 1cd92e4f..d19b271b 100644
--- a/reference-rpc-endpoint.json
+++ b/reference-rpc-endpoint.json
@@ -226,5 +226,14 @@
 	"id": 534352,
 	"urls": ["https://rpc.scroll.io"],
 	"default": ["scroll-mainnet"]
+    },
+    "zora": {
+	"id": 7777777,
+	"urls": [
+	    "https://rpc.zora.energy"
+	],
+	"default": [
+	    "op-zora-mainnet"
+	]
     }
 }