diff --git a/.github/workflows/post-process.yml b/.github/workflows/post-process.yml
index 662fc228..60889a38 100644
--- a/.github/workflows/post-process.yml
+++ b/.github/workflows/post-process.yml
@@ -33,26 +33,32 @@ jobs:
     strategy:
       max-parallel: 6
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        version:
+          - { python: "3.9", resolution: highest, extras: testing }
+          - { python: "3.10", resolution: lowest-direct, extras: testing }
+          - { python: "3.11", resolution: highest, extras: testing }
+          - { python: "3.12", resolution: lowest-direct, extras: testing }
         os:
           - ubuntu-latest
           - macos-latest
           - windows-latest
           - macos-14
         exclude:
-          - os: macos-14
-            python-version: "3.9"
+          - {version: {
+               python: "3.9" },
+            os: macos-14 }
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: ${{ matrix.python-version }}${{ matrix.dev }}
+          python-version: ${{ matrix.version.python }}
       - name: Install test requirements
         run: |
           python -m pip install --upgrade pip
-          pip install -e ".[testing]"
+          pip install uv
+          uv pip install '.[${{ matrix.version.extras }}]' --system --resolution=${{ matrix.version.resolution }}
       - name: Run tests
         run: |
           pytest -n auto --cov=src/pyEQL --cov-report=xml
diff --git a/pyproject.toml b/pyproject.toml
index b15030c5..a660728d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dependencies = [
         "numpy<2",
         "scipy>1.10",
         "pymatgen==2024.5.1",
-        "iapws",
+        "iapws>=1.0.1",
         "monty>=2024.7.12",
         "maggma>=0.67.0",
         "phreeqpython",
diff --git a/src/pyEQL/solution.py b/src/pyEQL/solution.py
index a5c1f68b..de9e0b7f 100644
--- a/src/pyEQL/solution.py
+++ b/src/pyEQL/solution.py
@@ -2295,7 +2295,7 @@ def _adjust_charge_balance(self, atol=1e-8) -> None:
                 return
 
             self.logger.info(
-                f"Solution is not electroneutral (C.B. = {cb} eq/L). Adjusting {self._cb_species} to compensate."
+                f"Adjusting {self._cb_species} to compensate."
             )
 
             if self.balance_charge == "pH":