diff --git a/Dockerfile b/Dockerfile
index 9ad7ba8..b1d87ae 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,25 +1,22 @@
 FROM hexletbasics/base-image:latest
 
-ENV DOTNET_CLI_TELEMETRY_OPTOUT 1
+RUN apt-get update && apt-get install -yq mono-devel
 
-RUN wget https://packages.microsoft.com/config/ubuntu/16.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb && \
-    dpkg -i packages-microsoft-prod.deb && \
-    rm packages-microsoft-prod.deb
-RUN apt-get update && apt-get install -y dotnet-sdk-5.0
+ARG SCRIPCS_VERSION=0.17.1
 
-WORKDIR /exercises-csharp
-ENV PATH=/exercises-csharp/bin:$PATH
+RUN wget -q https://github.com/scriptcs/scriptcs/archive/refs/tags/v${SCRIPCS_VERSION}.tar.gz \
+    && tar -xzf v${SCRIPCS_VERSION}.tar.gz \
+    && rm v${SCRIPCS_VERSION}.tar.gz
 
-RUN dotnet tool install -g JetBrains.ReSharper.GlobalTools
-RUN dotnet tool install -g dotnet-script
+RUN cd scriptcs-${SCRIPCS_VERSION} && ./build.sh
+ENV PATH=/scriptcs-${SCRIPCS_VERSION}/artifacts/Release/bin:$PATH
 
-ENV PATH=/root/.dotnet/tools:$PATH
+RUN scriptcs -install PowerAssert 1.0.87
 
-COPY src/ src/
+WORKDIR /exercises-csharp
+ENV PATH=/exercises-csharp/bin:$PATH
 
-RUN dotnet script src/Warmup.csx
+COPY src src
 RUN ln -s /exercises-csharp/src /src
 
 COPY . .
-
-RUN make test
diff --git a/bin/test.sh b/bin/test.sh
index 5188d69..cc70c08 100755
--- a/bin/test.sh
+++ b/bin/test.sh
@@ -1 +1,3 @@
-dotnet script Test.csx 2>&1
+#!/bin/bash
+
+scriptcs Test.csx 2>&1
diff --git a/modules/10-basics/10-hello-world/Exercise.csx b/modules/10-basics/10-hello-world/Exercise.csx
index 193a0ed..b0d8124 100644
--- a/modules/10-basics/10-hello-world/Exercise.csx
+++ b/modules/10-basics/10-hello-world/Exercise.csx
@@ -1 +1 @@
-Console.WriteLine("Hello, World!");
\ No newline at end of file
+Console.WriteLine("Hello, World!");
diff --git a/src/Functions.csx b/src/Functions.csx
index af46543..772b791 100644
--- a/src/Functions.csx
+++ b/src/Functions.csx
@@ -1,5 +1,13 @@
 class Functions
 {
-    public static double Random() => new Random().Next();
-    public static double RandomDouble() => new Random().NextDouble();
+    // public static double Random() => new Random().Next();
+    // public static double RandomDouble() => new Random().NextDouble();
+
+    public static double Random() {
+        return new Random().Next();
+    }
+
+    public static double RandomDouble() {
+        return new Random().NextDouble();
+    }
 }
diff --git a/src/Init.csx b/src/Init.csx
index e1e75ea..7c25ea5 100644
--- a/src/Init.csx
+++ b/src/Init.csx
@@ -1,2 +1,2 @@
-#r "/root/.nuget/packages/powerassert/1.0.87/lib/netstandard2.0/PowerAssert.dll"
+#r "/scriptcs_packages/PowerAssert.1.0.87/lib/netstandard2.0/PowerAssert.dll"
 #load "Functions.csx"