diff --git a/.github/workflows/docker-merge-testnet-5.yml b/.github/workflows/docker-merge-testnet-5.yml
new file mode 100644
index 00000000000..b86d665c95b
--- /dev/null
+++ b/.github/workflows/docker-merge-testnet-5.yml
@@ -0,0 +1,45 @@
+name: docker merge-devnet-5
+
+on:
+    push:
+        branches:
+            - merge-devnet-5
+
+env:
+    DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+    DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+    IMAGE_NAME: ${{ github.repository_owner}}/lighthouse
+    LCLI_IMAGE_NAME: ${{ github.repository_owner }}/lcli
+    BRANCH_NAME: merge-devnet-5
+
+jobs:
+    build-docker-amd64:
+        runs-on: ubuntu-18.04
+        steps:
+            - uses: actions/checkout@v2
+            - name: Update Rust
+              run: rustup update stable
+            - name: Dockerhub login
+              run: |
+                  echo "${DOCKER_PASSWORD}" | docker login --username ${DOCKER_USERNAME} --password-stdin
+            - name: Build AMD64 dockerfile (with push)
+              run: |
+                  docker build \
+                      --build-arg PORTABLE=true \
+                      --tag ${IMAGE_NAME}:${BRANCH_NAME} \
+                      --file ./Dockerfile .
+                  docker push ${IMAGE_NAME}:${BRANCH_NAME}
+    build-docker-lcli:
+        runs-on: ubuntu-18.04
+        steps:
+            - uses: actions/checkout@v2
+            - name: Dockerhub login
+              run: |
+                  echo "${DOCKER_PASSWORD}" | docker login --username ${DOCKER_USERNAME} --password-stdin
+            - name: Build lcli dockerfile (with push)
+              run: |
+                  docker build \
+                      --build-arg PORTABLE=true \
+                      --tag ${LCLI_IMAGE_NAME}:${BRANCH_NAME} \
+                      --file ./lcli/Dockerfile .
+                  docker push ${LCLI_IMAGE_NAME}:${BRANCH_NAME}
diff --git a/common/eth2_config/src/lib.rs b/common/eth2_config/src/lib.rs
index 7c1f5810fdd..a8bbc423353 100644
--- a/common/eth2_config/src/lib.rs
+++ b/common/eth2_config/src/lib.rs
@@ -236,5 +236,6 @@ macro_rules! define_hardcoded_nets {
 define_hardcoded_nets!(
     (mainnet, "mainnet", GENESIS_STATE_IS_KNOWN),
     (prater, "prater", GENESIS_STATE_IS_KNOWN),
-    (gnosis, "gnosis", GENESIS_STATE_IS_KNOWN)
+    (gnosis, "gnosis", GENESIS_STATE_IS_KNOWN),
+    (merge_devnet_5, "merge-devnet-5", GENESIS_STATE_IS_KNOWN)
 );
diff --git a/common/eth2_network_config/built_in_network_configs/merge-devnet-5/boot_enr.yaml b/common/eth2_network_config/built_in_network_configs/merge-devnet-5/boot_enr.yaml
new file mode 100644
index 00000000000..7141778503e
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/merge-devnet-5/boot_enr.yaml
@@ -0,0 +1,5 @@
+- enr:-Iq4QMCTfIMXnow27baRUb35Q8iiFHSIDBJh6hQM5Axohhf4b6Kr_cOCu0htQ5WvVqKvFgY28893DHAg8gnBAXsAVqmGAX53x8JggmlkgnY0gmlwhLKAlv6Jc2VjcDI1NmsxoQK6S-Cii_KmfFdUJL2TANL3ksaKUnNXvTCv1tLwXs0QgIN1ZHCCIyk
+- "enr:-KG4QL7_0L_f8Ug9ZHJt03upYa0PdpmEl5wInTejEsKE5X8MYbBU0FOuSAafsQxbQiWsY3326s41Kj-X28lYe_91AgIDhGV0aDKQ7zvXpGEABXAKAAAAAAAAAIJpZIJ2NIJpcIRA44B-iXNlY3AyNTZrMaEDWxFbrX3tif8zq7Q8fTqk00dAU3q6az5S9VqeDZ2rx9-DdGNwgiMog3VkcIIjKA"
+- "enr:-LK4QDHftmIXxcbqaI4qGj0lcyM66-OYVFP-neUNLqhaDO8qFpRU6uRQc4gsUrIHycXZVTqyB8gUoa13trsVFj_pLcQBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDvO9ekYQAFcAoAAAAAAAAAgmlkgnY0gmlwhKRcwTOJc2VjcDI1NmsxoQLYzPfRQpYidSbLk3dYmMkuVILl7h_ZXzKWcWUtpwHFjYN0Y3CCIyiDdWRwgiMo"
+- "enr:-MK4QHnkHjBWGHeleYfnw05TTxMFnFQoJpKYd7bg3M_8RMXZfzhYK3aXdz5cBX8NZuBFk9lSzqlh4hXiB_nRbOGI-BuGAX8HlAT3h2F0dG5ldHOI__________-EZXRoMpDvO9ekYQAFcAoAAAAAAAAAgmlkgnY0gmlwhKRczoeJc2VjcDI1NmsxoQJSZ0tu9MINVtKCJDDB5LL9XLNi8PYu8Y6cyyd0gqhtMIhzeW5jbmV0cwCDdGNwgiMog3VkcIIjKA=="
+- "enr:-Ku4QOklfyM8FkN9Te3s63nQ3gpQBjyJ7LFJLIr2aIwi_RnxZy6tdhd3VkkwH3VWEDGrHqGp0Hficq8yiICMOyOlp1kFh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDvO9ekYQAFcAoAAAAAAAAAgmlkgnY0gmlwhKRcwUiJc2VjcDI1NmsxoQLv43VYTS-uAdPKZlS7LETz0QhKrqqZLAB1-cAVn25IKoN0Y3CCIyg"
diff --git a/common/eth2_network_config/built_in_network_configs/merge-devnet-5/config.yaml b/common/eth2_network_config/built_in_network_configs/merge-devnet-5/config.yaml
new file mode 100644
index 00000000000..695a5a1902f
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/merge-devnet-5/config.yaml
@@ -0,0 +1,68 @@
+# Extends the mainnet preset
+PRESET_BASE: 'mainnet'
+# Genesis
+# ---------------------------------------------------------------
+MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 45000
+# Mar 3rd, 2021, 16:00 UTC
+MIN_GENESIS_TIME: 1646323200
+# Gensis fork
+GENESIS_FORK_VERSION: 0x60001069
+# 300 seconds (5 min)
+GENESIS_DELAY: 300
+
+
+# Forking
+# ---------------------------------------------------------------
+# Some forks are disabled for now:
+#  - These may be re-assigned to another fork-version later
+#  - Temporarily set to max uint64 value: 2**64 - 1
+
+# Altair
+ALTAIR_FORK_VERSION: 0x60001070
+ALTAIR_FORK_EPOCH: 50
+# Bellatrix
+BELLATRIX_FORK_VERSION: 0x60001071
+BELLATRIX_FORK_EPOCH: 150
+TERMINAL_TOTAL_DIFFICULTY: 500000000000
+TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
+TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615
+
+# Sharding
+SHARDING_FORK_VERSION: 0x03000000
+SHARDING_FORK_EPOCH: 18446744073709551615
+
+
+# Time parameters
+# ---------------------------------------------------------------
+# 12 seconds
+SECONDS_PER_SLOT: 12
+# 14 (estimate from Eth1 mainnet)
+SECONDS_PER_ETH1_BLOCK: 14
+# 2**8 (= 256) epochs ~27 hours
+MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
+# 2**8 (= 256) epochs ~27 hours
+SHARD_COMMITTEE_PERIOD: 256
+# 16 blocks is ~190s
+ETH1_FOLLOW_DISTANCE: 16
+
+
+# Validator cycle
+# ---------------------------------------------------------------
+# 2**2 (= 4)
+INACTIVITY_SCORE_BIAS: 4
+# 2**4 (= 16)
+INACTIVITY_SCORE_RECOVERY_RATE: 16
+# 2**4 * 10**9 (= 16,000,000,000) Gwei
+EJECTION_BALANCE: 16000000000
+# 2**2 (= 4)
+MIN_PER_EPOCH_CHURN_LIMIT: 4
+# 2**16 (= 65,536)
+CHURN_LIMIT_QUOTIENT: 65536
+
+
+# Deposit contract
+# ---------------------------------------------------------------
+# Custom Ethereum testnet
+DEPOSIT_CHAIN_ID: 1337762
+DEPOSIT_NETWORK_ID: 1337762
+DEPOSIT_CONTRACT_ADDRESS: 0x4242424242424242424242424242424242424242
diff --git a/common/eth2_network_config/built_in_network_configs/merge-devnet-5/deploy_block.txt b/common/eth2_network_config/built_in_network_configs/merge-devnet-5/deploy_block.txt
new file mode 100644
index 00000000000..c227083464f
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/merge-devnet-5/deploy_block.txt
@@ -0,0 +1 @@
+0
\ No newline at end of file
diff --git a/common/eth2_network_config/built_in_network_configs/merge-devnet-5/genesis.ssz.zip b/common/eth2_network_config/built_in_network_configs/merge-devnet-5/genesis.ssz.zip
new file mode 100644
index 00000000000..f78e3ee10b8
Binary files /dev/null and b/common/eth2_network_config/built_in_network_configs/merge-devnet-5/genesis.ssz.zip differ