diff --git a/.github/workflows/reference-blockchain-tests.yml b/.github/workflows/reference-blockchain-tests.yml
index 696272226..5665eb139 100644
--- a/.github/workflows/reference-blockchain-tests.yml
+++ b/.github/workflows/reference-blockchain-tests.yml
@@ -72,7 +72,7 @@ jobs:
         run: GOMEMLIMIT=32GiB ./gradlew -Dblockchain=Ethereum referenceBlockchainTests -x spotlessCheck --tests "${{ inputs.test_filter || 'BlockchainReferenceTest_*' }}"
         timeout-minutes: 360
         env:
-          REFERENCE_TESTS_PARALLELISM: 2
+          REFERENCE_TESTS_PARALLELISM: 1
           JAVA_OPTS: -Dorg.gradle.daemon=false
           CORSET_FLAGS: disable
           GOCORSET_FLAGS: -wd --ansi-escapes=false --report --air