diff --git a/.github/workflows/sub_buildMacOSCondaApple.yml b/.github/workflows/sub_buildMacOSCondaApple.yml
index f92043c755..59fc1666f2 100644
--- a/.github/workflows/sub_buildMacOSCondaApple.yml
+++ b/.github/workflows/sub_buildMacOSCondaApple.yml
@@ -78,7 +78,7 @@ jobs:
         with:
           activate-environment: .conda/freecad
           environment-file: conda/conda-env.yaml
-          channels: conda-forge,defaults
+          channels: conda-forge
           channel-priority: true
           miniforge-version: latest
       - name: Install FreeCAD dependencies
diff --git a/.github/workflows/sub_buildMacOSCondaIntel.yml b/.github/workflows/sub_buildMacOSCondaIntel.yml
index 102ca48cf8..b4d4e80b32 100644
--- a/.github/workflows/sub_buildMacOSCondaIntel.yml
+++ b/.github/workflows/sub_buildMacOSCondaIntel.yml
@@ -78,7 +78,7 @@ jobs:
         with:
           activate-environment: .conda/freecad
           environment-file: conda/conda-env.yaml
-          channels: conda-forge,defaults
+          channels: conda-forge
           channel-priority: true
           miniforge-version: latest
       - name: Install FreeCAD dependencies
diff --git a/.github/workflows/sub_buildUbuntu2204Conda.yml b/.github/workflows/sub_buildUbuntu2204Conda.yml
index 4e47caacad..43d31ec714 100644
--- a/.github/workflows/sub_buildUbuntu2204Conda.yml
+++ b/.github/workflows/sub_buildUbuntu2204Conda.yml
@@ -76,7 +76,7 @@ jobs:
         with:
           activate-environment: .conda/freecad
           environment-file: conda/conda-env.yaml
-          channels: conda-forge,defaults
+          channels: conda-forge
           channel-priority: true
           miniforge-version: latest
       - name: Install FreeCAD dependencies
diff --git a/.github/workflows/sub_buildUbuntu2204CondaQt6.yml b/.github/workflows/sub_buildUbuntu2204CondaQt6.yml
index 9c4cd26616..59fca06b8d 100644
--- a/.github/workflows/sub_buildUbuntu2204CondaQt6.yml
+++ b/.github/workflows/sub_buildUbuntu2204CondaQt6.yml
@@ -76,7 +76,7 @@ jobs:
         with:
           activate-environment: .conda/freecad
           environment-file: conda/conda-env-qt6.yaml
-          channels: conda-forge,defaults
+          channels: conda-forge
           channel-priority: true
           miniforge-version: latest
       - name: Install FreeCAD dependencies
diff --git a/.github/workflows/sub_buildWindowsConda.yml b/.github/workflows/sub_buildWindowsConda.yml
index 8acb274bcd..e51d5cc35a 100644
--- a/.github/workflows/sub_buildWindowsConda.yml
+++ b/.github/workflows/sub_buildWindowsConda.yml
@@ -71,7 +71,7 @@ jobs:
         with:
           activate-environment: .conda/freecad
           environment-file: conda/conda-env.yaml
-          channels: conda-forge,defaults
+          channels: conda-forge
           channel-priority: true
           miniforge-version: latest
       - name: Install FreeCAD dependencies
diff --git a/conda/conda-env-qt6.yaml b/conda/conda-env-qt6.yaml
index ed542fbf70..7fe8ee0ab4 100644
--- a/conda/conda-env-qt6.yaml
+++ b/conda/conda-env-qt6.yaml
@@ -2,6 +2,7 @@ name: freecad
 channels:
 - conda-forge
 dependencies:
+- conda-forge/noarch::conda-libmamba-solver==24.7.0
 - conda-devenv
 - mamba
 - python==3.12.*
diff --git a/conda/conda-env.yaml b/conda/conda-env.yaml
index eb2448722f..ecc36e8410 100644
--- a/conda/conda-env.yaml
+++ b/conda/conda-env.yaml
@@ -2,6 +2,7 @@ name: freecad
 channels:
 - conda-forge
 dependencies:
+- conda-forge/noarch::conda-libmamba-solver==24.7.0
 - conda-devenv
 - mamba
 - python==3.11.*
diff --git a/conda/environment-qt6.devenv.yml b/conda/environment-qt6.devenv.yml
index ad4025587c..6f44acd7de 100644
--- a/conda/environment-qt6.devenv.yml
+++ b/conda/environment-qt6.devenv.yml
@@ -3,6 +3,7 @@ channels:
 - conda-forge
 - conda-forge/label/pivy_rc
 dependencies:
+- conda-forge/noarch::conda-libmamba-solver==24.7.0
 - libspnav                             # [linux]
 - kernel-headers_linux-64              # [linux and x86_64]
 - libdrm-cos7-x86_64                   # [linux and x86_64]
diff --git a/conda/environment.devenv.yml b/conda/environment.devenv.yml
index 45dd753303..20c93e576b 100644
--- a/conda/environment.devenv.yml
+++ b/conda/environment.devenv.yml
@@ -2,6 +2,7 @@ name: freecad
 channels:
 - conda-forge
 dependencies:
+- conda-forge/noarch::conda-libmamba-solver==24.7.0
 - libspnav                             # [linux]
 - kernel-headers_linux-64              # [linux and x86_64]
 - libdrm-cos6-x86_64                   # [linux and x86_64]