diff --git a/.github/workflows/caching-envs-example.yml b/.github/workflows/caching-envs-example.yml
index 3aafdcca..68437a03 100644
--- a/.github/workflows/caching-envs-example.yml
+++ b/.github/workflows/caching-envs-example.yml
@@ -36,10 +36,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Setup Mambaforge
+      - name: Setup Miniforge
         uses: conda-incubator/setup-miniconda@a4260408e20b96e80095f42ff7f1a15b27dd94ca # v3.0.4
         with:
-          miniforge-variant: Mambaforge
           miniforge-version: latest
           activate-environment: anaconda-client-env
           use-mamba: true
@@ -65,6 +64,6 @@ jobs:
 
       - name: Update environment
         run:
-          mamba env update -n anaconda-client-env -f
+          conda env update -n anaconda-client-env -f
           etc/example-environment-caching.yml
         if: steps.cache.outputs.cache-hit != 'true'
diff --git a/.github/workflows/example-10.yml b/.github/workflows/example-10.yml
index c948553e..1da773cf 100644
--- a/.github/workflows/example-10.yml
+++ b/.github/workflows/example-10.yml
@@ -47,6 +47,9 @@ jobs:
           printenv | sort
 
   example-10-mambaforge:
+    # NOTE: Mambaforge is now equivalent to Miniforge.
+    # We are only testing this to make sure there's a smooth transition.
+    # It should be removed once the product is definitely sunset.
     # prevent cronjobs from running on forks
     if:
       (github.event_name == 'schedule' && github.repository ==
diff --git a/.github/workflows/example-13.yml b/.github/workflows/example-13.yml
index 4c6dd440..716e6e63 100644
--- a/.github/workflows/example-13.yml
+++ b/.github/workflows/example-13.yml
@@ -25,8 +25,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["macos-14"]
-        variant:
-          ["Miniforge3", "Mambaforge", "Miniconda", "no-variant", "empty-with"]
+        variant: ["Miniforge3", "Miniconda", "no-variant", "empty-with"]
         include:
           # This is Intel, not Apple Silicon, but doesn't bundle Miniconda
           - os: macos-13
@@ -34,7 +33,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: ./
-        if: matrix.variant == 'Miniforge3' || matrix.variant == 'Mambaforge'
+        if: matrix.variant == 'Miniforge3'
         id: setup-miniforge
         continue-on-error: true
         with:
@@ -72,7 +71,7 @@ jobs:
         shell: bash -el {0}
         run: conda create -n unused --dry-run zlib
       - name: Run mamba
-        if: matrix.variant == 'Miniforge3' || matrix.variant == 'Mambaforge'
+        if: matrix.variant == 'Miniforge3'
         shell: bash -el {0}
         run: mamba --version
       - name: Install Python
diff --git a/README.md b/README.md
index bfa89246..2150f7ec 100644
--- a/README.md
+++ b/README.md
@@ -7,11 +7,11 @@ This action sets up a `base`
   available in `$CONDA`
 - installing a specific (or latest) version of
   - [Miniconda3][miniconda-repo]
-  - [Miniforge][miniforge-releases] (or Mambaforge)
+  - [Miniforge][miniforge-releases]
   - any [constructor]-based installer by or URL or filesystem path
 
 A `conda-build-version` or `mamba-version` may be provided to install specific
-versions of `conda` or `mamba` into `base`
+versions of `conda` or `mamba` into `base`.
 
 The base `condabin/` folder is added to `$PATH` and shell integration is
 initialized across all platforms.
@@ -403,6 +403,10 @@ jobs:
 
 ### Example 6: Mamba
 
+> Note: `conda` 23.10+ uses `conda-libmamba-solver` by default, which provides
+> comparable performance to `mamba`. Most users won't need this setting with
+> recent conda versions.
+
 Experimental! Use `mamba` to enable much faster conda installs. `mamba-version`
 accepts a version string `x.y` (including `"*"`). It requires you specify
 `conda-forge` as part of the channels, ideally with the highest priority.
@@ -509,40 +513,8 @@ jobs:
           miniforge-version: latest
 ```
 
-In addition to `Miniforge3` with `conda` and `CPython`, for each of its many
-supported platforms and architectures, additional variants including
-`Mambaforge` (which comes pre-installed `mamba` in addition to `conda` on all
-platforms) and `Miniforge-pypy3`/`Mamabaforge-pypy3` (which replace `CPython`
-with `pypy3` on Linux/MacOS) are available.
-
-```yaml
-jobs:
-  example-10-mambaforge:
-    name: Ex10 (${{ matrix.os }}, Mambaforge)
-    runs-on: ${{ matrix.os }}-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        os: ["ubuntu", "macos", "windows"]
-        include:
-          - os: ubuntu
-            environment-file: etc/example-environment-no-name.yml
-            miniforge-variant: Mambaforge
-            miniforge-version: 4.9.2-4
-          - os: windows
-            environment-file: etc/example-explicit.Windows.conda.lock
-            condarc-file: etc/example-condarc.yml
-            miniforge-variant: Mambaforge
-    steps:
-      - uses: actions/checkout@v4
-      - uses: conda-incubator/setup-miniconda@v3
-        with:
-          condarc-file: ${{ matrix.condarc-file }}
-          environment-file: ${{ matrix.environment-file }}
-          miniforge-variant: ${{ matrix.miniforge-variant }}
-          miniforge-version: ${{ matrix.miniforge-version }}
-          use-mamba: true
-```
+In addition to `Miniforge3` with `conda`, `mamba` and `CPython`, you can also
+install `Miniforge-pypy3`, which replaces `CPython` with `PyPy.
 
 ### Example 11: Alternative Architectures
 
@@ -678,13 +650,11 @@ The first installation step should setup a Miniconda variant without specifying
 a environment file.
 
 ```yaml
-- name: Setup Mambaforge
+- name: Setup Miniforge
   uses: conda-incubator/setup-miniconda@v3
   with:
-    miniforge-variant: Mambaforge
     miniforge-version: latest
     activate-environment: anaconda-client-env
-    use-mamba: true
 ```
 
 It's a good idea to refresh the cache every 24 hours to avoid inconsistencies of
diff --git a/action.yml b/action.yml
index 2ec29f7c..9e1699d7 100644
--- a/action.yml
+++ b/action.yml
@@ -40,10 +40,9 @@ inputs:
     description:
       "If provided, this variant of Miniforge will be downloaded and installed.
       If `miniforge-version` is not provided, the `latest` version will be used.
-      Currently-known values: - Miniforge3 (default) - Miniforge-pypy3 -
-      Mambaforge - Mambaforge-pypy3 Visit
+      Currently-known values: Miniforge3 (default), Miniforge-pypy3. Visit
       https://github.com/conda-forge/miniforge/releases/ for more information on
-      available variants"
+      available variants."
     required: false
     default: ""
   miniforge-version:
diff --git a/dist/setup/index.js b/dist/setup/index.js
index 7078b2a9..77635470 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -48150,6 +48150,13 @@ function parseInputs() {
         if (core.isDebug()) {
             core.info(JSON.stringify(inputs));
         }
+        if (inputs.miniforgeVariant === "Mambaforge" ||
+            inputs.miniforgeVariant === "Mambaforge-pypy3") {
+            core.warning("'Mambaforge' variants are now equivalent to 'Miniforge3'. " +
+                "In the future, we will ignore with a warning and use 'Miniforge3'. " +
+                "Eventually, using 'Mambaforge' will throw an error. " +
+                "Please change to 'Miniforge3' at your earliest convenience.");
+        }
         return inputs;
     });
 }
diff --git a/src/input.ts b/src/input.ts
index a605d80a..65f00e1c 100644
--- a/src/input.ts
+++ b/src/input.ts
@@ -137,5 +137,17 @@ export async function parseInputs(): Promise<types.IActionInputs> {
     core.info(JSON.stringify(inputs));
   }
 
+  if (
+    inputs.miniforgeVariant === "Mambaforge" ||
+    inputs.miniforgeVariant === "Mambaforge-pypy3"
+  ) {
+    core.warning(
+      "'Mambaforge' variants are now equivalent to 'Miniforge3'. " +
+        "In the future, we will ignore with a warning and use 'Miniforge3'. " +
+        "Eventually, using 'Mambaforge' will throw an error. " +
+        "Please change to 'Miniforge3' at your earliest convenience.",
+    );
+  }
+
   return inputs;
 }