diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fc0a26c2..d5c1a43d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,7 +55,7 @@ jobs:
         cache-suffix: covcheck
 
     - if: ${{ matrix.label == 'oldestdeps' }}
-      run: echo "UV_RESOLUTION=lowest-direct" >> "$GITHUB_ENV"
+      run: echo "UV_RESOLUTION=lowest" >> "$GITHUB_ENV"
 
     - name: Run tests (without coverage)
       if: ${{ ! startswith( matrix.os, 'ubuntu' ) }}
diff --git a/pyproject.toml b/pyproject.toml
index 50408904..d4bb107f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,6 +45,14 @@ typecheck = [
     "pyright>=1.1.390",
 ]
 
+[tool.uv]
+constraint-dependencies = [
+    # avoid transitive dependencies on six and pyparsing via pytest -> packaging -> { six , pyparsing }
+    "packaging>=22.0", # TODO: remove this line when bumping pytest >= 8.5.0
+    # avoid building 1.0.0 (no wheels), via pytest
+    "iniconfig>=1.0.1", # TODO: remove this line when bumping pytest >= 8.5.0
+]
+
 [tool.uv.workspace]
 members = ["lib/inifix"]
 
diff --git a/uv.lock b/uv.lock
index e710e8f3..a6bc4553 100644
--- a/uv.lock
+++ b/uv.lock
@@ -11,6 +11,10 @@ members = [
     "inifix",
     "inifix-cli",
 ]
+constraints = [
+    { name = "iniconfig", specifier = ">=1.0.1" },
+    { name = "packaging", specifier = ">=22.0" },
+]
 
 [[package]]
 name = "attrs"