diff --git a/.github/workflows/package-main.yml b/.github/workflows/package-main.yml
index bb107f069e..b7b6b44172 100644
--- a/.github/workflows/package-main.yml
+++ b/.github/workflows/package-main.yml
@@ -27,10 +27,36 @@ jobs:
         if: ${{ matrix.os == 'macos-latest' }}
         uses: melusina-org/setup-macports@v1
 
+      - name: Install loader tools on macOS
+        if: ${{ matrix.os == 'macos-latest' }}
+        run: |
+          sudo port -v install ld64
+
       - name: Install icu4c on macOS
         if: ${{ matrix.os == 'macos-latest' }}
         run: |
-          sudo port -v install icu
+          sudo port -v install icu @74.2_0 +universal
+
+      - name: Fixup loader paths for icu4c
+        if: ${{ matrix.os == 'macos-latest' }}
+        # LIB_DEPENDENCIES are of the form "<ICU lib short name> <dependency as ICU lib short name>"
+        # For example, libicuuc (shortened to "uc") depends on libicudata (shortened to "data")
+        # Dependencies can be seen by running "dyld_info -dependents /path/to/something.dylib"
+        run: |
+          ICU_VERSION=74
+          LIB_DEPENDENCIES="
+          i18n data
+          i18n uc
+          io data
+          io i18n
+          io uc
+          uc data
+          "
+          LIB_DEPENDENCIES=$(echo "$LIB_DEPENDENCIES" | sed '/^$/d')
+          while IFS= read -r line; do
+            set -- $line
+            sudo install_name_tool -change "/opt/local/lib/libicu$2.$ICU_VERSION.dylib" "@loader_path/libicu$2.$ICU_VERSION.dylib" "/opt/local/lib/libicu$1.$ICU_VERSION.dylib"
+          done <<< "$LIB_DEPENDENCIES"
 
       - name: Checkout git repo
         uses: actions/checkout@v4
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index ae29240a3f..75f0c86b64 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -27,10 +27,36 @@ jobs:
         if: ${{ matrix.os == 'macos-latest' }}
         uses: melusina-org/setup-macports@v1
 
+      - name: Install loader tools on macOS
+        if: ${{ matrix.os == 'macos-latest' }}
+        run: |
+          sudo port -v install ld64
+
       - name: Install icu4c on macOS
         if: ${{ matrix.os == 'macos-latest' }}
         run: |
-          sudo port -v install icu
+          sudo port -v install icu @74.2_0 +universal
+
+      - name: Fixup loader paths for icu4c
+        if: ${{ matrix.os == 'macos-latest' }}
+        # LIB_DEPENDENCIES are of the form "<ICU lib short name> <dependency as ICU lib short name>"
+        # For example, libicuuc (shortened to "uc") depends on libicudata (shortened to "data")
+        # Dependencies can be seen by running "dyld_info -dependents /path/to/something.dylib"
+        run: |
+          ICU_VERSION=74
+          LIB_DEPENDENCIES="
+          i18n data
+          i18n uc
+          io data
+          io i18n
+          io uc
+          uc data
+          "
+          LIB_DEPENDENCIES=$(echo "$LIB_DEPENDENCIES" | sed '/^$/d')
+          while IFS= read -r line; do
+            set -- $line
+            sudo install_name_tool -change "/opt/local/lib/libicu$2.$ICU_VERSION.dylib" "@loader_path/libicu$2.$ICU_VERSION.dylib" "/opt/local/lib/libicu$1.$ICU_VERSION.dylib"
+          done <<< "$LIB_DEPENDENCIES"
 
       - name: Checkout git repo
         uses: actions/checkout@v4
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2f5b8558ba..e29adc1bf8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,9 +30,36 @@ jobs:
         if: ${{ matrix.os == 'macos-latest' }}
         uses: melusina-org/setup-macports@v1
 
+      - name: Install loader tools on macOS
+        if: ${{ matrix.os == 'macos-latest' }}
+        run: |
+          sudo port -v install ld64
+
       - name: Install icu4c on macOS
         if: ${{ matrix.os == 'macos-latest' }}
-        run: sudo port -v install icu
+        run: |
+          sudo port -v install icu @74.2_0 +universal
+
+      - name: Fixup loader paths for icu4c
+        if: ${{ matrix.os == 'macos-latest' }}
+        # LIB_DEPENDENCIES are of the form "<ICU lib short name> <dependency as ICU lib short name>"
+        # For example, libicuuc (shortened to "uc") depends on libicudata (shortened to "data")
+        # Dependencies can be seen by running "dyld_info -dependents /path/to/something.dylib"
+        run: |
+          ICU_VERSION=74
+          LIB_DEPENDENCIES="
+          i18n data
+          i18n uc
+          io data
+          io i18n
+          io uc
+          uc data
+          "
+          LIB_DEPENDENCIES=$(echo "$LIB_DEPENDENCIES" | sed '/^$/d')
+          while IFS= read -r line; do
+            set -- $line
+            sudo install_name_tool -change "/opt/local/lib/libicu$2.$ICU_VERSION.dylib" "@loader_path/libicu$2.$ICU_VERSION.dylib" "/opt/local/lib/libicu$1.$ICU_VERSION.dylib"
+          done <<< "$LIB_DEPENDENCIES"
 
       - name: Check out Git repository
         uses: actions/checkout@v4
diff --git a/c-sharp/ParanextDataProvider.csproj b/c-sharp/ParanextDataProvider.csproj
index 222e08e9a6..6d46b31de0 100644
--- a/c-sharp/ParanextDataProvider.csproj
+++ b/c-sharp/ParanextDataProvider.csproj
@@ -28,7 +28,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="icu.net" Version="2.10.0" />
+    <PackageReference Include="icu.net" Version="3.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.1" />
     <PackageReference Include="Microsoft.ICU.ICU4C.Runtime" Version="72.1.0.1" Condition="$([MSBuild]::IsOsPlatform('Windows'))" />
@@ -60,7 +60,7 @@
     by default.
     -->
   <ItemGroup>
-    <Content Include="/opt/local/lib/libicu*.??.dylib" Condition="$([MSBuild]::IsOsPlatform('macOS'))">
+    <Content Include="/opt/local/lib/libicu*.??.dylib" Exclude="/opt/local/lib/libicutest*.dylib;/opt/local/lib/libicutu*.dylib" Condition="$([MSBuild]::IsOsPlatform('macOS'))">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
   </ItemGroup>
diff --git a/c-sharp/Program.cs b/c-sharp/Program.cs
index 7e4cfce959..76e77fb14b 100644
--- a/c-sharp/Program.cs
+++ b/c-sharp/Program.cs
@@ -16,6 +16,14 @@ public static async Task Main()
         Console.WriteLine("Paranext data provider starting up");
         Thread.CurrentThread.Name = "Main";
 
+        // Turn on additional logging to help diagnose failures on macOS
+        if (OperatingSystem.IsMacOS())
+        {
+            System.Diagnostics.Trace.Listeners.Add(new System.Diagnostics.ConsoleTraceListener());
+            System.Diagnostics.Trace.AutoFlush = true;
+            System.Diagnostics.Trace.WriteLine("Trace logging enabled");
+        }
+
         using PapiClient papi = new();
         try
         {