diff --git a/.github/workflows/continuous_integration.yml b/.github/workflows/continuous_integration.yml
index fc0a6cfa2..40445faf1 100644
--- a/.github/workflows/continuous_integration.yml
+++ b/.github/workflows/continuous_integration.yml
@@ -22,12 +22,6 @@ jobs:
             extra_options: "-A x64",
             build_type: "Debug"
           }
-        - {
-            name: "Visual Studio 32-bit",
-            os: windows-latest,
-            extra_options: "-A Win32 -DFORCE_INTERNAL_ZLIB=ON",
-            build_type: "Release"
-          }
         - {
             name: "macOS",
             os: macos-latest,
@@ -40,14 +34,6 @@ jobs:
             os: macos-latest,
             build_type: "Debug"
           }
-        - {
-            name: "Linux GCC 5",
-            os: ubuntu-latest,
-            extra_options: "-DCMAKE_C_COMPILER=/usr/bin/gcc-5 -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 \
-                            -DDYN_FLUIDSYNTH=OFF -DDYN_OPENAL=OFF -DDYN_SNDFILE=OFF -DDYN_MPG123=OFF",
-            deps_cmdline: "sudo apt update && sudo apt install g++-5 libsdl2-dev libopenal-dev libfluidsynth-dev libmpg123-dev libsndfile1-dev",
-            build_type: "MinSizeRel"
-          }
         - {
             name: "Linux GCC 7",
             os: ubuntu-latest,
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4e59452f2..5d6a76421 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,11 @@
-cmake_minimum_required( VERSION 2.8.7 )
+cmake_minimum_required( VERSION 3.1.0 )
 project(GZDoom)
 
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF) 
+
+
 if( COMMAND cmake_policy )
 	if( POLICY CMP0011 )
 		cmake_policy( SET CMP0011 NEW )
diff --git a/src/common/engine/sc_man.cpp b/src/common/engine/sc_man.cpp
index e3225d396..41b5c7719 100644
--- a/src/common/engine/sc_man.cpp
+++ b/src/common/engine/sc_man.cpp
@@ -1247,7 +1247,7 @@ void FScanner::AddSymbol(const char* name, uint64_t value)
 	Symbol sym;
 	sym.tokenType = TK_UIntConst;
 	sym.Number = value;
-	sym.Float = value;
+	sym.Float = (double)value;
 	symbols.Insert(name, sym);
 }
 
diff --git a/src/playsim/fragglescript/t_func.cpp b/src/playsim/fragglescript/t_func.cpp
index c2df2c659..889d820f2 100644
--- a/src/playsim/fragglescript/t_func.cpp
+++ b/src/playsim/fragglescript/t_func.cpp
@@ -1879,7 +1879,7 @@ void FParser::SF_FloorTexture(void)
 		
 		t_return.type = svt_string;
 		auto tex = TexMan.GetGameTexture(sector->GetTexture(sector_t::floor));
-		t_return.string = tex? tex->GetName() : "";
+		t_return.string = tex? tex->GetName() : FString();
 	}
 }
 
@@ -1969,7 +1969,7 @@ void FParser::SF_CeilingTexture(void)
 		
 		t_return.type = svt_string;
 		auto tex = TexMan.GetGameTexture(sector->GetTexture(sector_t::ceiling));
-		t_return.string = tex? tex->GetName() : "";
+		t_return.string = tex? tex->GetName() : FString();
 	}
 }