diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 572b55c0b..88eb4ba05 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,6 +28,9 @@ on:
 
 env: 
   CACHE_NUMBER: 0
+  # the 2022 baseline env pulls the deprecated PyPI "sklearn" shim, which now
+  # hard-errors on install; this is the workaround the error message names
+  SKLEARN_ALLOW_DEPRECATED_SKLEARN_PACKAGE_INSTALL: "True"
 
 jobs:
   ################################################################################
@@ -41,18 +44,18 @@ jobs:
     steps:
       - 
         name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - 
-        name: Setup Mambaforge
-        uses: conda-incubator/setup-miniconda@v2
+        name: Setup Miniforge
+        uses: conda-incubator/setup-miniconda@v3
         with:
-          miniforge-variant: Mambaforge
+          miniforge-variant: Miniforge3
           miniforge-version: latest
           activate-environment: srbench
           use-mamba: true
       - 
         name: Cache conda
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: /usr/share/miniconda3/envs/srbench
           key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{hashFiles('environment.yml','experiment/methods/src/*.sh')}}-${{ github.sha }}
@@ -85,7 +88,7 @@ jobs:
     steps:
       - 
         name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - 
         name: generate alg list
         run: bash ci/get_algorithm_list.sh
@@ -111,18 +114,18 @@ jobs:
     steps:
       - 
         name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - 
-        name: Setup Mambaforge
-        uses: conda-incubator/setup-miniconda@v2
+        name: Setup Miniforge
+        uses: conda-incubator/setup-miniconda@v3
         with:
-          miniforge-variant: Mambaforge
+          miniforge-variant: Miniforge3
           miniforge-version: latest
           activate-environment: srbench
           use-mamba: true
       - 
         name: Cache conda
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: /usr/share/miniconda3/envs/srbench
           key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('environment.yml','experiment/methods/src/*.sh') }}-${{ github.sha }}
@@ -156,18 +159,18 @@ jobs:
     steps:
       - 
         name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - 
-        name: Setup Mambaforge
-        uses: conda-incubator/setup-miniconda@v2
+        name: Setup Miniforge
+        uses: conda-incubator/setup-miniconda@v3
         with:
-          miniforge-variant: Mambaforge
+          miniforge-variant: Miniforge3
           miniforge-version: latest
           activate-environment: srbench
           use-mamba: true
       - 
         name: Cache conda
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: /usr/share/miniconda3/envs/srbench
           key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('environment.yml','experiment/methods/src/*.sh') }}-${{ github.sha }}