diff --git a/.github/workflows/build-soroban-dev.yml b/.github/workflows/build-soroban-dev.yml
index 34e3052a..774bdc2b 100644
--- a/.github/workflows/build-soroban-dev.yml
+++ b/.github/workflows/build-soroban-dev.yml
@@ -34,10 +34,10 @@ jobs:
     with:
       arch: amd64
       tag: soroban-dev-amd64
-      core_ref: soroban-preview-10-July20
-      core_configure_flags: --disable-tests --enable-next-protocol-version-unsafe-for-production
-      go_ref: soroban-v0.0.9.1
-      soroban_tools_ref: v0.9.2
+      core_ref: ecb24df104c2453a00fa5097d2e879d7731b9596
+      core_configure_flags: --disable-tests
+      go_ref: soroban-v1.0.0-rc
+      soroban_tools_ref: v20.0.0-rc1
       test_matrix: |
         {
           "network": ["standalone"],
@@ -52,11 +52,11 @@ jobs:
     with:
       arch: arm64
       tag: soroban-dev-arm64
-      core_ref: soroban-preview-10-July20
-      core_configure_flags: --disable-tests --enable-next-protocol-version-unsafe-for-production
+      core_ref: ecb24df104c2453a00fa5097d2e879d7731b9596
+      core_configure_flags: --disable-tests
       core_build_runner_type: ubuntu-latest-16-cores
-      go_ref: soroban-v0.0.9.1
-      soroban_tools_ref: v0.9.2
+      go_ref: soroban-v1.0.0-rc
+      soroban_tools_ref: v20.0.0-rc1
       soroban_rpc_build_runner_type: ubuntu-latest-16-cores
       test_matrix: |
         {
diff --git a/Makefile b/Makefile
index 76ad55b6..85c34423 100644
--- a/Makefile
+++ b/Makefile
@@ -27,10 +27,10 @@ build-testing:
 
 build-soroban-dev:
 	$(MAKE) build TAG=soroban-dev \
-		CORE_REF=soroban-preview-10-July20 \
-		CORE_CONFIGURE_FLAGS='--disable-tests --enable-next-protocol-version-unsafe-for-production' \
-		HORIZON_REF=soroban-v0.0.9.1 \
-		SOROBAN_RPC_REF=v0.9.2
+		CORE_REF=v20.0.0rc1 \
+		CORE_CONFIGURE_FLAGS='--disable-tests' \
+		HORIZON_REF=soroban-v1.0.0-rc \
+		SOROBAN_RPC_REF=v20.0.0-rc1
 
 build:
 	$(MAKE) -j 4 build-deps