diff --git a/.github/workflows/R-CMD-check.yml b/.github/workflows/R-CMD-check.yml
index 85347760..833dde80 100644
--- a/.github/workflows/R-CMD-check.yml
+++ b/.github/workflows/R-CMD-check.yml
@@ -78,20 +78,30 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y texlive-latex-base libglpk-dev texlive-fonts-recommended libgsl-dev
-
+      
+      - name: Check GSL library location
+        run: ls -l /usr/lib/x86_64-linux-gnu/libgsl*
+      
+      - name: Set LD_LIBRARY_PATH
+        run: |
+          echo "LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu:$LD_LIBRARY_PATH" >> $GITHUB_ENV
+      
+      - name: Verify LD_LIBRARY_PATH
+        run: echo $LD_LIBRARY_PATH
+        
       - name: Set up R dependencies (R 3.6)
         if: matrix.config.r == '3.6'
         uses: r-lib/actions/setup-r-dependencies@v2
         with:
           extra-packages: |
             Matrix@1.6-5
+            Rfast@1.9.8
             actuar@2.3-3
             evaluate@0.23
             fastICA@1.2-1
             FNN@1.1.3.2
             knitr@1.45
             phangorn@2.7.1
-            Rfast@1.9.8
             rjson@0.2.20
             XML@3.99-0.3
           needs: |