--- a/.docker/Dockerfile-parachain-upgrade-data.j2
+++ b/.docker/Dockerfile-parachain-upgrade-data.j2
@@ -1,4 +1,3 @@
-ARG POLKADOT_BUILD_BRANCH
 FROM uniquenetwork/builder-polkadot:{{ POLKADOT_BUILD_BRANCH }} as polkadot
 
 # ===== Rust builder =====
--- a/.docker/Dockerfile-parachain-upgrade.j2
+++ b/.docker/Dockerfile-parachain-upgrade.j2
@@ -1,4 +1,3 @@
-ARG POLKADOT_BUILD_BRANCH
 FROM uniquenetwork/builder-polkadot:{{ POLKADOT_BUILD_BRANCH }} as polkadot
 
 # ===== Rust builder =====
--- a/.env
+++ b/.env
@@ -1,5 +1,4 @@
 RUST_TOOLCHAIN=nightly-2022-11-15
-POLKADOT_BUILD_BRANCH=release-v0.9.37
 POLKADOT_LAUNCH_BRANCH=unique-network
 RELAY_CHAIN_TYPE=westend
 
--- a/.github/workflows/collator-selection.yml
+++ b/.github/workflows/collator-selection.yml
@@ -67,7 +67,7 @@
           output_file: .docker/docker-compose.collators.${{ matrix.network }}.yml
           variables: |
             RUST_TOOLCHAIN=${{ env.RUST_TOOLCHAIN }}
-            POLKADOT_BUILD_BRANCH=${{ env.POLKADOT_BUILD_BRANCH }}
+            POLKADOT_BUILD_BRANCH=${{ matrix.relay_branch }}
             POLKADOT_LAUNCH_BRANCH=${{ env.POLKADOT_LAUNCH_BRANCH }}
             NETWORK=${{ matrix.network }}
             BRANCH=${{ github.head_ref }}
--- a/.github/workflows/market-test.yml
+++ b/.github/workflows/market-test.yml
@@ -23,7 +23,7 @@
     strategy:
       matrix:
         include:
-          - network: "opal"
+          - network: "opal", relay_branch {${{ env.UNIQUEWEST_MAINNET_BRANCH }}}
 
     steps:
       - name: Clean Workspace
@@ -58,7 +58,7 @@
           variables: |
             REPO_URL=${{ github.server_url }}/${{ github.repository }}.git
             RUST_TOOLCHAIN=${{ env.RUST_TOOLCHAIN }}
-            POLKADOT_BUILD_BRANCH=${{ env.POLKADOT_BUILD_BRANCH }}
+            POLKADOT_BUILD_BRANCH=${{ matrix.relay_branch }}
             POLKADOT_LAUNCH_BRANCH=${{ env.POLKADOT_LAUNCH_BRANCH }}
             NETWORK=${{ matrix.network }}
             BRANCH=${{ github.head_ref }}
--- a/.github/workflows/testnet-build.yml
+++ b/.github/workflows/testnet-build.yml
@@ -40,9 +40,9 @@
         id: create_matrix
         with:
           matrix: |
-            network {opal}
-            network {quartz}
-            network {unique}
+            network {opal}, relay_branch {${{ env.UNIQUEWEST_MAINNET_BRANCH }}}
+            network {quartz}, relay_branch {${{ env.KUSAMA_MAINNET_BRANCH }}}
+            network {unique}, relay_branch {${{ env.POLKADOT_MAINNET_BRANCH }}}
 
   testnet-build:
     needs: prepare-execution-marix
@@ -83,7 +83,7 @@
           variables: |
             RUST_TOOLCHAIN=${{ env.RUST_TOOLCHAIN }}
             NETWORK=${{ matrix.network }}
-            POLKADOT_BUILD_BRANCH=${{ env.POLKADOT_BUILD_BRANCH }}
+            POLKADOT_BUILD_BRANCH=${{ matrix.relay_branch }}
             POLKADOT_LAUNCH_BRANCH=${{ env.POLKADOT_LAUNCH_BRANCH }}
             NETWORK=${{ matrix.network }}
             BRANCH=${{ github.head_ref }}
@@ -109,7 +109,7 @@
           password: ${{ secrets.CORE_DOCKERHUB_TOKEN }}
 
       - name: Pull polkadot docker image
-        run: docker pull uniquenetwork/builder-polkadot:${{ env.POLKADOT_BUILD_BRANCH }}           
+        run: docker pull uniquenetwork/builder-polkadot:${{ matrix.relay_branch }}           
 
       - name: Build the stack
         run: cd .docker/ && docker build --file ./Dockerfile-testnet.${{ matrix.network }}.yml --tag uniquenetwork/${{ matrix.network }}-testnet-local-nightly:nightly-${{ steps.branchname.outputs.value }}-${{ github.sha }} .