diff --git a/.github/workflows/deploy-github-page.yml b/.github/workflows/deploy-github-page.yml
index d4c8ad0c..4f60b9f0 100644
--- a/.github/workflows/deploy-github-page.yml
+++ b/.github/workflows/deploy-github-page.yml
@@ -40,7 +40,10 @@ jobs:
       - name: Build xeus-python
         shell: bash -l {0}
         run: |
-          micromamba create -f environment-wasm-host.yml --platform=emscripten-wasm32
+          micromamba create \
+            -f environment-wasm-host.yml --platform=emscripten-wasm32 \
+            -c https://prefix.dev/emscripten-forge-dev \
+            -c https://prefix.dev/conda-forge
 
           set -eux
 
diff --git a/environment-wasm-build.yml b/environment-wasm-build.yml
index cfdf57fb..617bf918 100644
--- a/environment-wasm-build.yml
+++ b/environment-wasm-build.yml
@@ -1,6 +1,6 @@
 name: xeus-python-wasm-build
 channels:
-  - https://repo.prefix.dev/emscripten-forge-dev
+  - https://prefix.dev/emscripten-forge-dev
   - conda-forge
 dependencies:
   - cmake
diff --git a/environment-wasm-host.yml b/environment-wasm-host.yml
index 1c2fe6f2..72e89111 100644
--- a/environment-wasm-host.yml
+++ b/environment-wasm-host.yml
@@ -1,7 +1,7 @@
 name: xeus-python-wasm-host
 channels:
-  - https://repo.prefix.dev/emscripten-forge-dev
-  - https://repo.prefix.dev/conda-forge
+  - https://prefix.dev/emscripten-forge-dev
+  - https://prefix.dev/conda-forge
 dependencies:
   - ipython
   - pybind11 <3