diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..7bc6fd0
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,60 @@
+name: Test Suite
+
+# Only triggers on pushes/PRs to master
+on:
+    pull_request:
+        branches:
+            - master
+    push:
+        branches:
+            - master
+
+jobs:
+    test:
+        name: CI
+        strategy:
+            fail-fast: false
+            matrix:
+                os: [ubuntu-latest, windows-latest]
+                dc: [dmd-latest, ldc-latest, ldc-1.15.0]
+                arch: [x86, x86_64]
+
+        runs-on: ${{ matrix.os }}
+        steps:
+            - uses: actions/checkout@v2
+
+            - name: Install D compiler
+              uses: dlang-community/setup-dlang@v1
+              with:
+                  compiler: ${{ matrix.dc }}
+
+            - name: Run tests
+              env:
+                CONFIG: ${{matrix.config}}
+                ARCH: ${{matrix.arch}}
+              shell: bash
+              run: dub test :engine
+    testsuite:
+        name: Test262
+        strategy:
+            fail-fast: false
+            matrix:
+                os: [ubuntu-latest]
+                dc: [dmd-latest]
+                arch: [x86_64]
+
+        runs-on: ${{ matrix.os }}
+        steps:
+            - uses: actions/checkout@v2
+
+            - name: Install D compiler
+              uses: dlang-community/setup-dlang@v1
+              with:
+                  compiler: ${{ matrix.dc }}
+
+            - name: Run tests
+              env:
+                CONFIG: ${{matrix.config}}
+                ARCH: ${{matrix.arch}}
+              shell: bash
+              run: ./run-test262.sh
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 2ab348e..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,6 +0,0 @@
-language: d
-sudo: false
-
-script:
-  - ./build.sh
-  - ./run-test262.sh
diff --git a/ds-ext/source/ext.d b/ds-ext/source/ext.d
index 81ec9df..4efb1e6 100644
--- a/ds-ext/source/ext.d
+++ b/ds-ext/source/ext.d
@@ -2,9 +2,9 @@ import dmdscript.program;
 import dmdscript.script;
 import dmdscript.extending;
 
+import std.file;
 import std.stdio;
 import std.typecons;
-import std.stdio;
 
 int func(int a,int b){ return a*b;  }
                    
diff --git a/engine/source/dmdscript/outbuffer.d b/engine/source/dmdscript/outbuffer.d
index d52a810..3b26129 100644
--- a/engine/source/dmdscript/outbuffer.d
+++ b/engine/source/dmdscript/outbuffer.d
@@ -250,68 +250,6 @@ class OutBuffer
         return cast(string) data[0 .. offset].idup;
     }
 
-    /*****************************************
-     * Append output of C's vprintf() to internal buffer.
-     */
-
-    void vprintf(string format, va_list args)
-    {
-        char[128] buffer;
-        char* p;
-        uint psize;
-        int count;
-
-        auto f = toStringz(format);
-        p = buffer.ptr;
-        psize = buffer.length;
-        for (;;)
-        {
-            version(Windows)
-            {
-                count = _vsnprintf(p,psize,f,args);
-                if (count != -1)
-                    break;
-                psize *= 2;
-                p = cast(char *) alloca(psize); // buffer too small, try again with larger size
-            }
-            version(Posix)
-            {
-                count = vsnprintf(p,psize,f,args);
-                if (count == -1)
-                    psize *= 2;
-                else if (count >= psize)
-                    psize = count + 1;
-                else
-                    break;
-                /+
-                if (p != buffer)
-                    c.stdlib.free(p);
-                p = (char *) c.stdlib.malloc(psize);    // buffer too small, try again with larger size
-                +/
-                p = cast(char *) alloca(psize); // buffer too small, try again with larger size
-            }
-        }
-        write(cast(ubyte[]) p[0 .. count]);
-        /+
-        version (Posix)
-        {
-            if (p != buffer)
-                c.stdlib.free(p);
-        }
-        +/
-    }
-
-    /*****************************************
-     * Append output of C's printf() to internal buffer.
-     */
-
-    void printf(string format, ...)
-    {
-        va_list ap;
-        ap = cast(va_list)&format;
-        ap += format.sizeof;
-        vprintf(format, ap);
-    }
 
     /*****************************************
      * At offset index into buffer, create nbytes of space by shifting upwards
@@ -349,7 +287,6 @@ unittest
     buf.write("hello"[]);
     buf.write(cast(byte)0x20);
     buf.write("world"[]);
-    buf.printf(" %d", 6);
     //printf("buf = '%.*s'\n", buf.toString());
-    assert(cmp(buf.toString(), "hello world 6") == 0);
+    assert(cmp(buf.toString(), "hello world") == 0);
 }
diff --git a/run-test262.sh b/run-test262.sh
index 409fc3b..95d6866 100755
--- a/run-test262.sh
+++ b/run-test262.sh
@@ -1,25 +1,33 @@
 #!/bin/bash
-set -e
+set -xe
+
+./build.sh
 
 if ! [ -d test262 ] ; then
     echo "Cloning test262 test suite..."
     git clone https://github.com/tc39/test262.git
+    cd test262
+    git checkout a456b0a390bb0f70b4cb8d38cb5ab0ecb557a851
+    cd ..
     echo "Applying patch to make the harness ES3/5 compatible..."
     sed 's/  let /  var /g' -i test262/harness/assert.js
 fi
 if ! [ -d test262-harness-py ] ; then
     echo "Cloning the console test runner..."
     git clone https://github.com/test262-utils/test262-harness-py.git
+    cd test262-harness-py
+    git checkout 0f2acdd882c84cff43b9d60df7574a1901e2cdcd
+    cd ..
     echo "Applying patch to adjust the runner for the latest version of the test suite..."
     sed '/self\.suite\.GetInclude("cth\.js")/d' -i test262-harness-py/src/test262.py
 fi
 
 echo "Running the test suite..."
 cd test262-harness-py
-src/test262.py --summary --non_strict_only --command ../timed-dmdscript.sh --tests=../test262 | tee ../dmdscript-test262.log | grep '=== .* failed in .* ==='
+python2 src/test262.py --summary --non_strict_only --command ../timed-dmdscript.sh --tests=../test262 | tee ../dmdscript-test262.log | grep '=== .* failed in .* ==='
 cd ..
 
-EXPECTED_TO_PASS=5238
+EXPECTED_TO_PASS=5223
 PASSED=$(grep ' - Passed [0-9]* tests' dmdscript-test262.log | sed -n 's/.*Passed \([0-9]*\) tests.*/\1/;P')
 
 if [ "$PASSED" -gt "$EXPECTED_TO_PASS" ]; then