diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 069068369aba9d364e102c9d972ddca547c11f2e..835b668de25905ef9825f072ecee96a1123ab47e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -30,7 +30,7 @@ variables:
   RUSTY_CACHIER_COMPRESSION_METHOD: zstd
   NEXTEST_FAILURE_OUTPUT: immediate-final
   NEXTEST_SUCCESS_OUTPUT: final
-  ZOMBIENET_IMAGE: "docker.io/paritytech/zombienet:v1.3.71"
+  ZOMBIENET_IMAGE: "docker.io/paritytech/zombienet:v1.3.75"
   DOCKER_IMAGES_VERSION: "${CI_COMMIT_REF_NAME}-${CI_COMMIT_SHORT_SHA}"
 
 default:
diff --git a/polkadot/zombienet_tests/functional/0001-parachains-pvf.toml b/polkadot/zombienet_tests/functional/0001-parachains-pvf.toml
index 9ae4d899e69024651580e446b96f457f1fdb885c..53205867fd12c7e3f310e9c2c65d896855bdb5c0 100644
--- a/polkadot/zombienet_tests/functional/0001-parachains-pvf.toml
+++ b/polkadot/zombienet_tests/functional/0001-parachains-pvf.toml
@@ -4,7 +4,6 @@ timeout = 1000
 [relaychain]
 default_image = "{{ZOMBIENET_INTEGRATION_TEST_IMAGE}}"
 chain = "rococo-local"
-chain_spec_command = "polkadot build-spec --chain rococo-local --disable-default-bootnode"
 
 [relaychain.default_resources]
 limits = { memory = "4G", cpu = "2" }
@@ -133,4 +132,4 @@ genesis_state_generator = "undying-collator export-genesis-state --pov-size=1000
 [types.Header]
 number = "u64"
 parent_hash = "Hash"
-post_state = "Hash"
\ No newline at end of file
+post_state = "Hash"
diff --git a/polkadot/zombienet_tests/functional/0002-parachains-disputes.toml b/polkadot/zombienet_tests/functional/0002-parachains-disputes.toml
index e6aeb8e245c2bab3e53628498aeb2c7caa626e0f..c63d3e02170801b42c600993b3b93bad4c838b07 100644
--- a/polkadot/zombienet_tests/functional/0002-parachains-disputes.toml
+++ b/polkadot/zombienet_tests/functional/0002-parachains-disputes.toml
@@ -8,7 +8,6 @@ timeout = 1000
 [relaychain]
 default_image = "{{ZOMBIENET_INTEGRATION_TEST_IMAGE}}"
 chain = "rococo-local"
-chain_spec_command = "polkadot build-spec --chain rococo-local --disable-default-bootnode"
 default_command = "polkadot"
 
 [relaychain.default_resources]
diff --git a/polkadot/zombienet_tests/functional/0004-parachains-garbage-candidate.toml b/polkadot/zombienet_tests/functional/0004-parachains-garbage-candidate.toml
index ef27d7b92f029d7978c9b7ab1a175c882fbb1d70..94eb6bb5bb1d024f25eb96769e1cc317bca0512b 100644
--- a/polkadot/zombienet_tests/functional/0004-parachains-garbage-candidate.toml
+++ b/polkadot/zombienet_tests/functional/0004-parachains-garbage-candidate.toml
@@ -9,7 +9,6 @@ bootnode = true
 [relaychain]
 default_image = "{{ZOMBIENET_INTEGRATION_TEST_IMAGE}}"
 chain = "rococo-local"
-chain_spec_command = "polkadot build-spec --chain rococo-local --disable-default-bootnode"
 default_command = "polkadot"
 
 [relaychain.default_resources]
diff --git a/polkadot/zombienet_tests/misc/0001-paritydb.toml b/polkadot/zombienet_tests/misc/0001-paritydb.toml
index 99dc9c66e26ee6b04bfea1951d7818e23be70118..e2130963f0ece02e55f6bff739ee8f5cc8e2de50 100644
--- a/polkadot/zombienet_tests/misc/0001-paritydb.toml
+++ b/polkadot/zombienet_tests/misc/0001-paritydb.toml
@@ -9,7 +9,6 @@ bootnode = true
 [relaychain]
 default_image = "{{ZOMBIENET_INTEGRATION_TEST_IMAGE}}"
 chain = "rococo-local"
-chain_spec_command = "polkadot build-spec --chain rococo-local"
 default_command = "polkadot"
 
 [relaychain.default_resources]