diff --git a/.github/workflows/lang-csharp-efcore.yml b/.github/workflows/lang-csharp-efcore.yml
index 643c8aa4..1d6b0075 100644
--- a/.github/workflows/lang-csharp-efcore.yml
+++ b/.github/workflows/lang-csharp-efcore.yml
@@ -33,6 +33,7 @@ jobs:
   test:
     name: "
      .NET: ${{ matrix.dotnet-version }}
+     Npgsql EF: ${{ matrix.npgsql-version }}
      CrateDB: ${{ matrix.cratedb-version }}
      on ${{ matrix.os }}"
     runs-on: ${{ matrix.os }}
@@ -44,6 +45,14 @@ jobs:
           '8.x',
           '9.x',
         ]
+        npgsql-version: [
+          '8.*',
+          '9.*',
+          # error: NU1202: Package Npgsql.EntityFrameworkCore.PostgreSQL 10.0.0-rc.2
+          # is not compatible with net9.0 (.NETCoreApp,Version=v9.0).
+          # Package Npgsql.EntityFrameworkCore.PostgreSQL 10.0.0-rc.2 supports: net10.0
+          # 'prerelease',
+        ]
         cratedb-version: [ 'nightly' ]
 
     # https://docs.github.com/en/free-pro-team@latest/actions/guides/about-service-containers
@@ -61,9 +70,6 @@ jobs:
       - name: Acquire sources
         uses: actions/checkout@v5
 
-      - name: Set up uv
-        uses: astral-sh/setup-uv@v7
-
       - name: Set up .NET ${{ matrix.dotnet-version }}
         id: dotnet
         uses: actions/setup-dotnet@v5
@@ -79,6 +85,19 @@ jobs:
         run: |
           echo '{"sdk":{"version": "${{ steps.dotnet.outputs.dotnet-version }}"}}' > ./global.json
 
-      - name: Validate by-language/csharp-efcore
+      # Propagate the Npgsql version from the test matrix slot value,
+      # display the current list of packages with versions,
+      # and invoke the test suite.
+      - name: "Validate by-language/csharp-efcore, Npgsql ${{ matrix.npgsql-version }}"
         run: |
-          uv run --with=pueblo ngr test by-language/csharp-efcore --dotnet-version=${{ matrix.dotnet-version }}
+          set -e
+          cd by-language/csharp-efcore
+          if [[ "${{ matrix.npgsql-version }}" = "prerelease" ]]; then
+            dotnet add package Npgsql.EntityFrameworkCore.PostgreSQL --prerelease
+          elif [[ "${{ matrix.npgsql-version }}" = "latest" ]]; then
+            dotnet add package Npgsql.EntityFrameworkCore.PostgreSQL --version=*
+          else
+            dotnet add package Npgsql.EntityFrameworkCore.PostgreSQL --version=${{ matrix.npgsql-version }}
+          fi
+          dotnet list package
+          dotnet run test
diff --git a/.github/workflows/lang-csharp-npgsql.yml b/.github/workflows/lang-csharp-npgsql.yml
index af7df6cf..e8a8e937 100644
--- a/.github/workflows/lang-csharp-npgsql.yml
+++ b/.github/workflows/lang-csharp-npgsql.yml
@@ -45,7 +45,11 @@ jobs:
           '8.x',
           '9.x',
         ]
-        npgsql-version: [ '8.0.7', '9.0.3' ]
+        npgsql-version: [
+          '8.*',
+          '9.*',
+          'prerelease',
+        ]
         cratedb-version: [ 'nightly' ]
 
     # https://docs.github.com/en/free-pro-team@latest/actions/guides/about-service-containers
@@ -63,9 +67,6 @@ jobs:
       - name: Acquire sources
         uses: actions/checkout@v5
 
-      - name: Set up uv
-        uses: astral-sh/setup-uv@v7
-
       - name: Set up .NET ${{ matrix.dotnet-version }}
         id: dotnet
         uses: actions/setup-dotnet@v5
@@ -81,6 +82,19 @@ jobs:
         run: |
           echo '{"sdk":{"version": "${{ steps.dotnet.outputs.dotnet-version }}"}}' > ./global.json
 
-      - name: Validate by-language/csharp-npgsql, Npgsql ${{ matrix.npgsql-version }}
+      # Propagate the Npgsql version from the test matrix slot value,
+      # display the current list of packages with versions,
+      # and invoke the test suite.
+      - name: "Validate by-language/csharp-npgsql, Npgsql ${{ matrix.npgsql-version }}"
         run: |
-          uv run --with=pueblo ngr test by-language/csharp-npgsql --dotnet-version=${{ matrix.dotnet-version }} --npgsql-version=${{ matrix.npgsql-version }}
+          set -e
+          cd by-language/csharp-npgsql
+          if [[ "${{ matrix.npgsql-version }}" = "prerelease" ]]; then
+            dotnet add package Npgsql --prerelease
+          elif [[ "${{ matrix.npgsql-version }}" = "latest" ]]; then
+            dotnet add package Npgsql --version=*
+          else
+            dotnet add package Npgsql --version=${{ matrix.npgsql-version }}
+          fi
+          dotnet list package
+          dotnet run test