diff --git a/.github/workflows/test_branches.yml b/.github/workflows/test_branches.yml
index c89e2078819..f96aef36e1f 100644
--- a/.github/workflows/test_branches.yml
+++ b/.github/workflows/test_branches.yml
@@ -23,7 +23,7 @@ env:
   PYTHON_CORE_PKGS: wheel
   PYPI_ONLY: z3-solver linear-tree
   PYPY_EXCLUDE: scipy numdifftools seaborn statsmodels linear-tree
-  CACHE_VER: v260304.0
+  CACHE_VER: v260512.3
   NEOS_EMAIL: tests@pyomo.org
   SRC_REF: ${{ github.head_ref || github.ref }}
   PYOMO_WORKFLOW: branch
@@ -147,6 +147,13 @@ jobs:
           TARGET: win
           PYENV: pip
 
+        - os: ubuntu-latest
+          python: '3.10'
+          other: /slim
+          slim: 1
+          TARGET: linux
+          PYENV: pip
+
     steps:
     - name: Checkout Pyomo source
       uses: actions/checkout@v6
@@ -356,6 +363,8 @@ jobs:
         python --version
         # We need setuptools so we can run Pyomo's setup.py
         conda install setuptools
+        # Make sure pip is installed for dependencies not available through conda
+        conda install pip
         # Note: some pypi packages are not available through conda
         PYOMO_DEPENDENCIES=`python setup.py dependencies \
             --extras "$EXTRAS" | tail -1`
@@ -566,7 +575,7 @@ jobs:
             Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
         $INSTALLER = "${env:DOWNLOAD_DIR}/gams_install.exe"
         # Demo licenses are included for 5mo from the newest release
-        $URL = "https://d37drm4t2jghv5.cloudfront.net/distributions/52.5.0"
+        $URL = "https://d37drm4t2jghv5.cloudfront.net/distributions/latest"
         if ( "${{matrix.TARGET}}" -eq "win" ) {
             $URL = "$URL/windows/windows_x64_64.exe"
         } elseif ( "${{matrix.TARGET}}" -eq "osx" ) {
@@ -680,9 +689,9 @@ jobs:
             cd gjh_asl_json-master/Thirdparty
             # Patch get.ASL to use curl
             URL="http://www.ampl.com/netlib/ampl/solvers.tgz"
-            sed -i "s|wget |curl -o solvers.tgz |" get.ASL
-            cat get.ASL
-            ./get.ASL
+            sed "s|wget |curl -o solvers.tgz |" get.ASL > get.ASL.patched
+            cat get.ASL.patched
+            bash ./get.ASL.patched
             cd ..
             make
             mv bin "$INSTALL_DIR/bin"
diff --git a/.github/workflows/test_pr_and_main.yml b/.github/workflows/test_pr_and_main.yml
index 6670904ca06..fc5bf334435 100644
--- a/.github/workflows/test_pr_and_main.yml
+++ b/.github/workflows/test_pr_and_main.yml
@@ -31,7 +31,7 @@ env:
   PYTHON_CORE_PKGS: wheel
   PYPI_ONLY: z3-solver linear-tree
   PYPY_EXCLUDE: scipy numdifftools seaborn statsmodels linear-tree
-  CACHE_VER: v260304.0
+  CACHE_VER: v260512.3
   NEOS_EMAIL: tests@pyomo.org
   SRC_REF: ${{ github.head_ref || github.ref }}
   PYOMO_WORKFLOW: |
@@ -151,10 +151,18 @@ jobs:
           PYENV: pip
           PACKAGES: cython
 
-        - os: windows-latest
+        # [13 May 26] Disabled until we can sort out the seg fault issue
+        #- os: windows-latest
+        #  python: '3.10'
+        #  other: /pip
+        #  TARGET: win
+        #  PYENV: pip
+
+        - os: ubuntu-latest
           python: '3.10'
-          other: /pip
-          TARGET: win
+          other: /slim
+          slim: 1
+          TARGET: linux
           PYENV: pip
 
         - os: ubuntu-latest
@@ -164,13 +172,6 @@ jobs:
           TARGET: linux
           PYENV: pip
 
-        - os: ubuntu-latest
-          python: '3.10'
-          other: /slim
-          slim: 1
-          TARGET: linux
-          PYENV: pip
-
         - os: ubuntu-latest
           python: 3.12
           other: /numpy2
@@ -409,6 +410,8 @@ jobs:
         python --version
         # We need setuptools so we can run Pyomo's setup.py
         conda install setuptools
+        # Make sure pip is installed for dependencies not available through conda
+        conda install pip
         # Note: some pypi packages are not available through conda
         PYOMO_DEPENDENCIES=`python setup.py dependencies \
             --extras "$EXTRAS" | tail -1`
@@ -619,7 +622,7 @@ jobs:
             Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
         $INSTALLER = "${env:DOWNLOAD_DIR}/gams_install.exe"
         # Demo licenses are included for 5mo from the newest release
-        $URL = "https://d37drm4t2jghv5.cloudfront.net/distributions/52.5.0"
+        $URL = "https://d37drm4t2jghv5.cloudfront.net/distributions/latest"
         if ( "${{matrix.TARGET}}" -eq "win" ) {
             $URL = "$URL/windows/windows_x64_64.exe"
         } elseif ( "${{matrix.TARGET}}" -eq "osx" ) {
@@ -733,9 +736,9 @@ jobs:
             cd gjh_asl_json-master/Thirdparty
             # Patch get.ASL to use curl
             URL="http://www.ampl.com/netlib/ampl/solvers.tgz"
-            sed -i "s|wget |curl -o solvers.tgz |" get.ASL
-            cat get.ASL
-            ./get.ASL
+            sed "s|wget |curl -o solvers.tgz |" get.ASL > get.ASL.patched
+            cat get.ASL.patched
+            bash ./get.ASL.patched
             cd ..
             make
             mv bin "$INSTALL_DIR/bin"
diff --git a/pyomo/neos/__init__.py b/pyomo/neos/__init__.py
index 5a6831f5bd5..612c970e724 100644
--- a/pyomo/neos/__init__.py
+++ b/pyomo/neos/__init__.py
@@ -16,6 +16,7 @@
     'bonmin': 'Deterministic local MINLP solver',
     'cbc': 'MILP solver',
     'conopt': 'Feasible path NLP solver',
+    'copt': 'MILP solver',
     'couenne': 'Deterministic global MINLP solver',
     'cplex': 'MILP solver',
     'fico-xpress': 'MILP solver',
diff --git a/pyomo/neos/tests/test_neos.py b/pyomo/neos/tests/test_neos.py
index 9dff7f8d6ae..a2e83e4f399 100644
--- a/pyomo/neos/tests/test_neos.py
+++ b/pyomo/neos/tests/test_neos.py
@@ -223,6 +223,9 @@ def test_cbc(self):
     def test_conopt(self):
         self._run('conopt')
 
+    def test_copt(self):
+        self._run('copt')
+
     def test_couenne(self):
         self._run('couenne')