diff --git a/.github/workflows/build_wheel.yml b/.github/workflows/build_wheel.yml
index 2a2931c7..402ea21b 100644
--- a/.github/workflows/build_wheel.yml
+++ b/.github/workflows/build_wheel.yml
@@ -56,7 +56,7 @@ jobs:
             submodules: true
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.16.2
+        uses: pypa/cibuildwheel@v2.17.0
         with:
           package-dir: ./swmm-toolkit
         env:
@@ -64,6 +64,9 @@ jobs:
           CIBW_BEFORE_TEST: pip install -r {package}/test-requirements.txt
           # mac needs ninja to build
           CIBW_BEFORE_BUILD_MACOS: brew install ninja
+          # remove system swig (cmake bug doesn't respect python venv)
+          # https://github.com/swig/swig/issues/2481#issuecomment-1949573105
+          CIBW_BEFORE_BUILD_LINUX: rm -f $(which swig) && rm -f $(which swig4.0)
           # configure cibuildwheel to build native archs ('auto'), and some emulated ones
           CIBW_ARCHS_LINUX: x86_64
           CIBW_ARCHS_WINDOWS: AMD64
@@ -102,10 +105,13 @@ jobs:
           platforms: all
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.16.2
+        uses: pypa/cibuildwheel@v2.17.0
         with:
           package-dir: ./swmm-toolkit
         env:
+          # remove system swig (cmake bug doesn't respect python venv)
+          # https://github.com/swig/swig/issues/2481#issuecomment-1949573105
+          CIBW_BEFORE_BUILD_LINUX: rm -f $(which swig) && rm -f $(which swig4.0)
           # configure cibuildwheel to build native archs ('auto'), and some emulated ones
           CIBW_ARCHS_LINUX: aarch64
           CIBW_ARCHS_MACOS: arm64
diff --git a/swmm-toolkit/AUTHORS b/swmm-toolkit/AUTHORS
index 334d0a05..a908903a 100644
--- a/swmm-toolkit/AUTHORS
+++ b/swmm-toolkit/AUTHORS
@@ -7,4 +7,5 @@ Caleb Buahin <caleb.buahin@xyleminc.com>
 Laurent Courty <lrntct@gmail.com>
 Constantine Karos <ckaros@outlook.com>
 Abhiram Mullapudi <abhiramm@umich.edu>
-Brooke Mason <bemason@umich.edu>
\ No newline at end of file
+Brooke Mason <bemason@umich.edu>
+Sara C. Troutman <stroutm@umich.edu>
\ No newline at end of file
diff --git a/swmm-toolkit/CMakeLists.txt b/swmm-toolkit/CMakeLists.txt
index 08301bce..b899ca44 100644
--- a/swmm-toolkit/CMakeLists.txt
+++ b/swmm-toolkit/CMakeLists.txt
@@ -15,7 +15,7 @@ cmake_minimum_required (VERSION 3.17)
 
 project(swmm-toolkit
     VERSION
-        0.15.3
+        0.15.4
 )
 
 
diff --git a/swmm-toolkit/setup.py b/swmm-toolkit/setup.py
index 5ea2f994..275e6915 100644
--- a/swmm-toolkit/setup.py
+++ b/swmm-toolkit/setup.py
@@ -112,7 +112,7 @@ def exclude_files(cmake_manifest):
 
 setup(
     name = "swmm-toolkit",
-    version = "0.15.3",
+    version = "0.15.4",
 
     packages = ["swmm_toolkit", "swmm.toolkit"],
     package_dir = package_dir,
diff --git a/swmm-toolkit/src/swmm/toolkit/__init__.py b/swmm-toolkit/src/swmm/toolkit/__init__.py
index d759edd4..6440085c 100644
--- a/swmm-toolkit/src/swmm/toolkit/__init__.py
+++ b/swmm-toolkit/src/swmm/toolkit/__init__.py
@@ -19,7 +19,7 @@
 __credits__ = "Colleen Barr, Sam Hatchett"
 __license__ = "CC0 1.0 Universal"
 
-__version__ = "0.15.2"
+__version__ = "0.15.4"
 __date__ = "June 7, 2021"
 
 __maintainer__ = "Michael Tryby"
diff --git a/swmm-toolkit/src/swmm/toolkit/output_metadata.py b/swmm-toolkit/src/swmm/toolkit/output_metadata.py
index 93731f46..89b6210b 100644
--- a/swmm-toolkit/src/swmm/toolkit/output_metadata.py
+++ b/swmm-toolkit/src/swmm/toolkit/output_metadata.py
@@ -88,9 +88,10 @@ def _build_pollut_metadata(self, output_handle):
             # Create dictionary keys
             for i in range(1, n):
                 symbolic_name = 'POLLUT_CONC_' + str(i)
-                extend_enum(shared_enum.SubcatchAttribute, symbolic_name, 8 + i)
-                extend_enum(shared_enum.NodeAttribute, symbolic_name, 6 + i)
-                extend_enum(shared_enum.LinkAttribute, symbolic_name, 5 + i)
+                if symbolic_name not in shared_enum.SubcatchAttribute._member_names_:
+                    extend_enum(shared_enum.SubcatchAttribute, symbolic_name, 8 + i)
+                    extend_enum(shared_enum.NodeAttribute, symbolic_name, 6 + i)
+                    extend_enum(shared_enum.LinkAttribute, symbolic_name, 5 + i)
 
             # Update metadata dictionary with pollutant metadata
             for i, attr in enumerate(islice(shared_enum.SubcatchAttribute, 8, None)):