diff --git a/.github/workflows/test-query-engine-template.yml b/.github/workflows/test-query-engine-template.yml
index 597953bf771d..9f20fdac1514 100644
--- a/.github/workflows/test-query-engine-template.yml
+++ b/.github/workflows/test-query-engine-template.yml
@@ -49,7 +49,9 @@ jobs:
       PRISMA_ENGINE_PROTOCOL: ${{ matrix.engine_protocol }}
       PRISMA_RELATION_LOAD_STRATEGY: ${{ matrix.relation_load_strategy }}
 
-    runs-on: "ubuntu-${{ inputs.ubuntu }}"
+    runs-on: "ubuntu-20.04"
+    # TODO: Replace with the following once `prisma@5.20.0` is released.
+    # runs-on: "ubuntu-${{ inputs.ubuntu }}"
     steps:
       - uses: actions/checkout@v4
       - uses: actions-rust-lang/setup-rust-toolchain@v1
diff --git a/.github/workflows/test-schema-engine.yml b/.github/workflows/test-schema-engine.yml
index 7d9f76b69a8b..88c9ba43f745 100644
--- a/.github/workflows/test-schema-engine.yml
+++ b/.github/workflows/test-schema-engine.yml
@@ -105,7 +105,9 @@ jobs:
             is_vitess: true
             single_threaded: true
 
-    runs-on: "ubuntu-${{ matrix.database.ubuntu || 'latest' }}"
+    runs-on: "ubuntu-20.04"
+    # TODO: Replace with the following once `prisma@5.20.0` is released.
+    # runs-on: "ubuntu-${{ matrix.database.ubuntu || 'latest' }}"
     steps:
       - uses: actions/checkout@v4
       - uses: actions-rust-lang/setup-rust-toolchain@v1