diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 37ba316937..384371cf84 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -46,6 +46,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./dev/environment-dev.yml
           environment-name: build_env
           cache-environment: true
diff --git a/.github/workflows/linters.yml b/.github/workflows/linters.yml
index ed8676b5ea..912f1354d6 100644
--- a/.github/workflows/linters.yml
+++ b/.github/workflows/linters.yml
@@ -38,6 +38,7 @@ jobs:
       - name: Install pre-commit and identify
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-name: linters
           create-args: pre-commit identify
       - name: Add micromamba to GITHUB_PATH
diff --git a/.github/workflows/static_build.yml b/.github/workflows/static_build.yml
index 9a872c71cf..a5ea9e8291 100644
--- a/.github/workflows/static_build.yml
+++ b/.github/workflows/static_build.yml
@@ -99,6 +99,7 @@ jobs:
           git -C micromamba-feedstock/ config --local --add safe.directory '*'
       - uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-name: mambabuild
           create-args: python boa
           post-cleanup: none # FIXME the cleanup fails on OSX
@@ -179,6 +180,7 @@ jobs:
         uses: ilammy/msvc-dev-cmd@v1
       - uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-name: mambabuild
           init-shell: bash cmd.exe
           create-args: >-
diff --git a/.github/workflows/unix_impl.yml b/.github/workflows/unix_impl.yml
index 1f88de78a9..ac96a1f57a 100644
--- a/.github/workflows/unix_impl.yml
+++ b/.github/workflows/unix_impl.yml
@@ -49,6 +49,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./dev/environment-dev.yml
           environment-name: build_env
           cache-environment: true
@@ -123,6 +124,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./build/environment.lock
           environment-name: build_env
       - name: Run solv-cpp tests
@@ -183,6 +185,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./build/environment.lock
           environment-name: build_env
       - name: Install libmambapy
@@ -242,6 +245,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./build/environment.lock
           environment-name: build_env
       - name: install zsh, xonsh, fish and tcsh in linux
@@ -322,6 +326,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./build/environment.lock
           environment-name: build_env
       - name: Run tests using conda-content-trust (server side)
diff --git a/.github/workflows/windows_impl.yml b/.github/workflows/windows_impl.yml
index fc73a8aebb..ebb2d6301e 100644
--- a/.github/workflows/windows_impl.yml
+++ b/.github/workflows/windows_impl.yml
@@ -25,6 +25,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./dev/environment-dev.yml
           environment-name: build_env
           cache-environment: true
@@ -79,6 +80,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./build/environment.lock
           environment-name: build_env
           init-shell: bash cmd.exe
@@ -118,6 +120,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./build/environment.lock
           environment-name: build_env
           init-shell: bash cmd.exe
@@ -150,6 +153,7 @@ jobs:
       - name: Create build environment
         uses: mamba-org/setup-micromamba@v3
         with:
+          micromamba-version: "2.9.0.rc1"
           environment-file: ./build/environment.lock
           environment-name: build_env
           init-shell: bash cmd.exe powershell