diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e333e837..79eab9f9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,13 +30,7 @@ jobs:
         uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
 
       - name: Setup COBOL
-        run: |
-          sudo apt-get update
-          sudo apt-get -y install curl tar libncurses5-dev libgmp-dev libdb-dev iproute2 ranger autoconf build-essential
-          sudo apt-get -y --purge autoremove
-
-          curl -sLk https://sourceforge.net/projects/open-cobol/files/gnu-cobol/3.1/gnucobol-3.1.2.tar.gz | tar xz
-          cd gnucobol-3.1.2 && ./configure --prefix=/usr && sudo make && sudo make install && sudo ldconfig
+        run: sudo apt update && sudo apt install -y gnucobol
 
       - name: Fetch CobolCheck
         run: bin/fetch-cobolcheck
diff --git a/exercises/practice/luhn/.meta/proof.ci.cob b/exercises/practice/luhn/.meta/proof.ci.cob
index e6ce556e..f610843f 100644
--- a/exercises/practice/luhn/.meta/proof.ci.cob
+++ b/exercises/practice/luhn/.meta/proof.ci.cob
@@ -26,7 +26,8 @@
                MOVE 0 TO WS-CARD-NUMBER
                EXIT PERFORM
            ELSE
-               MOVE CONCAT(WS-CARD-DIGITS, WS-CARD-NUMBER(WS-INDEX:1)) 
+               MOVE CONCATENATE(WS-CARD-DIGITS, 
+                  WS-CARD-NUMBER(WS-INDEX:1)) 
                TO WS-CARD-DIGITS
            END-IF
        END-PERFORM.
diff --git a/exercises/practice/two-fer/.meta/proof.ci.cob b/exercises/practice/two-fer/.meta/proof.ci.cob
index ea580208..661d65ba 100644
--- a/exercises/practice/two-fer/.meta/proof.ci.cob
+++ b/exercises/practice/two-fer/.meta/proof.ci.cob
@@ -11,7 +11,7 @@
        IF WS-NAME EQUAL SPACE THEN
            MOVE "One for you, one for me." TO WS-RESULT
        ELSE
-           MOVE FUNCTION CONCAT("One for ", 
+           MOVE FUNCTION CONCATENATE("One for ", 
            FUNCTION TRIM(WS-NAME TRAILING),", one for me.") 
            TO WS-RESULT
        END-IF.