diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a84b0112..8235a542 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         environment: ["r43", "r44"]
-    
+
     steps:
       - name: Checkout pull request branch
         uses: actions/checkout@v4
@@ -34,17 +34,17 @@ jobs:
         with:
           run-install: false
 
-      - name: Build package
-        run: pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml build
-
-      # - name: Run unit tests
-      #   run: pixi run --environment ${{ matrix.environment }} devtools_test
-      #
-      # - name: Check unit test code coverage
-      #   run: pixi run --environment ${{ matrix.environment }} codecov
+      - name: Run unit tests
+        run: pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml devtools_test
 
       - name: Run R CMD CHECK
-        run: pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml rcmdcheck
+        run: |
+          pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml build
+          pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml rcmdcheck
+
+      - name: Check unit test code coverage
+        if: ${{ matrix.environment == 'r44' }}
+        run: pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml codecov
 
   ci_osx-arm64:
     name: osx-arm64 CI
@@ -70,11 +70,10 @@ jobs:
         with:
           run-install: false
 
-      - name: Build package
-        run: pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml build
-
-      # - name: Run unit tests
-      #   run: pixi run --environment ${{ matrix.environment }} devtools_test
+      - name: Run unit tests
+        run: pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml devtools_test
 
       - name: Run R CMD CHECK
-        run: pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml rcmdcheck
+        run: |
+          pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml build
+          pixi run --environment ${{ matrix.environment }} --manifest-path /tmp/pixi/pixi.toml rcmdcheck
diff --git a/pixi.toml b/pixi.toml
index 1a70954e..a001ae23 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -36,6 +36,7 @@ r43 = {features = ["r44"]}
 "r-crayon" = "*"
 "r-ggplot2" = "*"
 "r-l0learn" = "*"
+"r-mr.ash.alpha_mccreight" = "*"
 
 # Suggested dependencies (for testing and documentation)
 "r-curl" = "*"
diff --git a/tests/testthat.R b/tests/testthat.R
index ebcc5c92..c6cafb2a 100644
--- a/tests/testthat.R
+++ b/tests/testthat.R
@@ -1,4 +1,5 @@
 library(testthat)
+library(Rcpp)
 library(susieR)
 
 test_check("susieR")