diff --git a/.github/workflows/amazon_bedrock.yml b/.github/workflows/amazon_bedrock.yml
index 48a800e53e..433a5bc899 100644
--- a/.github/workflows/amazon_bedrock.yml
+++ b/.github/workflows/amazon_bedrock.yml
@@ -78,9 +78,16 @@ jobs:
         if: success() && steps.aws-auth.outcome == 'success'
         run: hatch run cov-retry -m "integration"
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/amazon_sagemaker.yml b/.github/workflows/amazon_sagemaker.yml
index 85b5000812..09ccbf2b95 100644
--- a/.github/workflows/amazon_sagemaker.yml
+++ b/.github/workflows/amazon_sagemaker.yml
@@ -60,9 +60,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/astra.yml b/.github/workflows/astra.yml
index 4c036e6ed5..c047dcb892 100644
--- a/.github/workflows/astra.yml
+++ b/.github/workflows/astra.yml
@@ -64,9 +64,16 @@ jobs:
           ASTRA_DB_APPLICATION_TOKEN: ${{ secrets.ASTRA_DB_APPLICATION_TOKEN }}
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/azure_ai_search.yml b/.github/workflows/azure_ai_search.yml
index 6dce4d479b..63f336470a 100644
--- a/.github/workflows/azure_ai_search.yml
+++ b/.github/workflows/azure_ai_search.yml
@@ -58,9 +58,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/chroma.yml b/.github/workflows/chroma.yml
index 207d8ab6b1..eb362f47f4 100644
--- a/.github/workflows/chroma.yml
+++ b/.github/workflows/chroma.yml
@@ -64,9 +64,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/deepeval.yml b/.github/workflows/deepeval.yml
index bb266fc5e7..fe6ecf298d 100644
--- a/.github/workflows/deepeval.yml
+++ b/.github/workflows/deepeval.yml
@@ -73,4 +73,4 @@ jobs:
         with:
           title: |
             Core integrations nightly tests failure: ${{ github.workflow }}
-          api-key: ${{ secrets.CORE_DATADOG_API_KEY }}
+          api-key: ${{ secrets.CORE_DATADOG_API_KEY }}
\ No newline at end of file
diff --git a/.github/workflows/fastembed.yml b/.github/workflows/fastembed.yml
index 79eacf794f..dce6ef98f8 100644
--- a/.github/workflows/fastembed.yml
+++ b/.github/workflows/fastembed.yml
@@ -45,9 +45,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/llama_cpp.yml b/.github/workflows/llama_cpp.yml
index 8d1e4fc9d2..e645f77287 100644
--- a/.github/workflows/llama_cpp.yml
+++ b/.github/workflows/llama_cpp.yml
@@ -61,9 +61,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/meta_llama.yml b/.github/workflows/meta_llama.yml
index e8945a960c..7a4a49bed9 100644
--- a/.github/workflows/meta_llama.yml
+++ b/.github/workflows/meta_llama.yml
@@ -61,9 +61,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/mistral.yml b/.github/workflows/mistral.yml
index 78f056c9af..553761bdd9 100644
--- a/.github/workflows/mistral.yml
+++ b/.github/workflows/mistral.yml
@@ -61,9 +61,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/ollama.yml b/.github/workflows/ollama.yml
index 283d2513af..ec24e3def0 100644
--- a/.github/workflows/ollama.yml
+++ b/.github/workflows/ollama.yml
@@ -95,9 +95,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/openrouter.yml b/.github/workflows/openrouter.yml
index 5d3365f6df..46a4b4768f 100644
--- a/.github/workflows/openrouter.yml
+++ b/.github/workflows/openrouter.yml
@@ -61,9 +61,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/stackit.yml b/.github/workflows/stackit.yml
index eb2e2c3257..841b4f892d 100644
--- a/.github/workflows/stackit.yml
+++ b/.github/workflows/stackit.yml
@@ -61,9 +61,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/weaviate.yml b/.github/workflows/weaviate.yml
index d7c12cebb0..5092acb012 100644
--- a/.github/workflows/weaviate.yml
+++ b/.github/workflows/weaviate.yml
@@ -58,9 +58,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 
diff --git a/.github/workflows/weights_and_biases_weave.yml b/.github/workflows/weights_and_biases_weave.yml
index 243935aac5..15c928998c 100644
--- a/.github/workflows/weights_and_biases_weave.yml
+++ b/.github/workflows/weights_and_biases_weave.yml
@@ -57,9 +57,16 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"
+
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"