diff --git a/.github/workflows/cmake/action.yml b/.github/workflows/cmake/action.yml
index bb84c63..122feb8 100644
--- a/.github/workflows/cmake/action.yml
+++ b/.github/workflows/cmake/action.yml
@@ -46,13 +46,13 @@ runs:
       shell: bash
 
     - name: Build
-      if: "${{ !inputs.cmake_configure_only }}"
+      if: ${{inputs.cmake_configure_only == false}}
       working-directory: build
       run: make
       shell: bash
 
     - name: Test
-      if: "${{ !inputs.cmake_configure_only }}"
+      if: ${{inputs.cmake_configure_only == false}}
       working-directory: build
       run: make test
       shell: bash
diff --git a/.github/workflows/compilers.yml b/.github/workflows/compilers.yml
index 696a762..97cfa6a 100644
--- a/.github/workflows/compilers.yml
+++ b/.github/workflows/compilers.yml
@@ -11,16 +11,14 @@ on:
     branches: [ main ]
 
 # TODO (@carsonradtke)
-#  - [ ] flesh out strategy.matrix
 #  - [ ] Update README with latest versions actively tested
-#  - [ ] Do not use '*-latest' for runs-on
 jobs:
   gcc:
     strategy:
       matrix:
-        cxx_version: [ 17 ] # 14, 17, 20
-        build_type: [ 'Debug'] # 'Debug', 'Release'
-        gcc_version: [ 12 ] # 12, 13, 14
+        cxx_version: [ 14, 17, 20 ]
+        build_type: [ 'Debug', 'Release' ]
+        gcc_version: [ 10, 11, 12 ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -35,13 +33,13 @@ jobs:
   clang:
     strategy:
       matrix:
-        cxx_version: [ 17 ] # 14, 17, 20
-        build_type: [ 'Debug' ] # 'Debug', 'Release'
-        clang_version: [ 16 ] # 16, 17, 18
+        cxx_version: [ 14, 17, 20 ]
+        build_type: [ 'Debug', 'Release' ]
+        clang_version: [ 13, 14, 15 ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-
+     
       - name: Run CMake (configure, build, test)
         uses: ./.github/workflows/cmake
         with:
@@ -52,9 +50,9 @@ jobs:
   xcode:
     strategy:
       matrix:
-        cxx_version: [ 17 ] # 14, 17, 20
-        build_type: [ 'Debug' ] # 'Debug', 'Release'
-        xcode_version: [ "15.4" ] # "14.3.1", "15.4"
+        cxx_version: [ 14, 17, 20 ]
+        build_type: [ 'Debug', 'Release' ]
+        xcode_version: [ '14.3.1', '15.4' ]
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
@@ -72,10 +70,10 @@ jobs:
   VisualStudio:
     strategy:
       matrix:
-        cxx_version: [ 17 ] # 14, 17, 20
-        generator: [ "Visual Studio 17 2022" ] # "Visual Studio 16 2019", "Visual Studio 17 2022"
-        build_type: [ 'Debug' ] # 'Debug', 'Release'
-        extra_args: [ "", "-T ClangCL" ]
+        cxx_version: [ 14, 17, 20 ]
+        generator: [ 'Visual Studio 17 2022' ]
+        build_type: [ 'Debug', 'Release' ]
+        extra_args: [ '', '-T ClangCL' ]
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v4