diff --git a/.github/workflows/build-testing.yml b/.github/workflows/build-testing.yml
index feb07db0..e18e1d10 100644
--- a/.github/workflows/build-testing.yml
+++ b/.github/workflows/build-testing.yml
@@ -37,11 +37,11 @@ jobs:
     with:
       arch: amd64
       tag: testing-amd64
-      core_ref: v20.0.0
+      core_ref: v20.0.0-rc.2.2
       core_supports_enable_soroban_diagnostic_events: "true"
-      go_ref: horizon-v2.27.0
+      go_ref: horizon-v2.27.0-rc1
       xdr_ref: v20.0.1
-      soroban_tools_ref: v20.0.0
+      soroban_tools_ref: v20.0.0-rc4
       test_matrix: |
         {
           "network": ["testnet", "pubnet", "local"],
@@ -59,12 +59,12 @@ jobs:
     with:
       arch: arm64
       tag: testing-arm64
-      core_ref: v20.0.0
+      core_ref: v20.0.0-rc.2.2
       core_supports_enable_soroban_diagnostic_events: "true"
       core_build_runner_type: ubuntu-latest-16-cores
-      go_ref: horizon-v2.27.0
+      go_ref: horizon-v2.27.0-rc1
       xdr_ref: v20.0.1
-      soroban_tools_ref: v20.0.0
+      soroban_tools_ref: v20.0.0-rc4
       soroban_rpc_build_runner_type: ubuntu-latest-16-cores
       test_matrix: |
         {