diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5a73dceae2..68a013a253 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -92,16 +92,20 @@ commands:
             - /go/pkg/mod
 
 jobs:
-  test-llvm15-go122:
+  test-oldest:
+    # This tests our lowest supported versions of Go and LLVM, to make sure at
+    # least the smoke tests still pass.
     docker:
       - image: golang:1.22-bullseye
     steps:
       - test-linux:
           llvm: "15"
     resource_class: large
-  test-llvm20-go124:
+  test-newest:
+    # This tests the latest supported LLVM version when linking against system
+    # libraries.
     docker:
-      - image: golang:1.24-bullseye
+      - image: golang:1.25rc2-bullseye
     steps:
       - test-linux:
           llvm: "20"
@@ -110,8 +114,5 @@ jobs:
 workflows:
   test-all:
     jobs:
-      # This tests our lowest supported versions of Go and LLVM, to make sure at
-      # least the smoke tests still pass.
-      - test-llvm15-go122
-      # This tests LLVM 20 support when linking against system libraries.
-      - test-llvm20-go124
+      - test-oldest
+      - test-newest
diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index bda9474327..564978c821 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -39,7 +39,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v4
@@ -134,7 +134,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Build TinyGo (LLVM ${{ matrix.version }})
         run: go install -tags=llvm${{ matrix.version }}
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 803759892f..52e49eaff2 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -18,7 +18,7 @@ jobs:
     # statically linked binary.
     runs-on: ubuntu-latest
     container:
-      image: golang:1.24-alpine
+      image: golang:1.25rc2-alpine
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
@@ -137,7 +137,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Install wasmtime
         uses: bytecodealliance/actions/wasmtime/setup@v1
@@ -181,7 +181,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Install Node.js
         uses: actions/setup-node@v4
@@ -298,7 +298,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v4
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 6c428c98c4..ee7fbf1adb 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -41,7 +41,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Restore cached LLVM source
         uses: actions/cache/restore@v4
@@ -147,7 +147,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v4
@@ -177,7 +177,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v4
@@ -213,7 +213,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.25.0-rc.2'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v4
diff --git a/Dockerfile b/Dockerfile
index 520ad7c9b5..c45dd5d777 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.24 AS tinygo-llvm
+FROM golang:1.25rc2 AS tinygo-llvm
 
 RUN apt-get update && \
     apt-get install -y apt-utils make cmake clang-15 ninja-build && \
@@ -33,7 +33,7 @@ RUN cd /tinygo/ && \
 
 # tinygo-compiler copies the compiler build over to a base Go container (without
 # all the build tools etc).
-FROM golang:1.24 AS tinygo-compiler
+FROM golang:1.25rc2 AS tinygo-compiler
 
 # Copy tinygo build.
 COPY --from=tinygo-compiler-build /tinygo/build/release/tinygo /tinygo
diff --git a/builder/config.go b/builder/config.go
index b36b9333f3..5fb74ee192 100644
--- a/builder/config.go
+++ b/builder/config.go
@@ -26,7 +26,7 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 
 	// Version range supported by TinyGo.
 	const minorMin = 19
-	const minorMax = 24
+	const minorMax = 25
 
 	// Check that we support this Go toolchain version.
 	gorootMajor, gorootMinor, err := goenv.GetGorootVersion()
diff --git a/src/internal/abi/escape.go b/src/internal/abi/escape.go
index 0ecdf80308..d8b9c778a0 100644
--- a/src/internal/abi/escape.go
+++ b/src/internal/abi/escape.go
@@ -8,3 +8,10 @@ import "unsafe"
 func NoEscape(p unsafe.Pointer) unsafe.Pointer {
 	return p
 }
+
+func Escape[T any](x T) T {
+	// This function is used from internal/synctest which doesn't seem to be
+	// used much by other packages.
+	// This probably needs support from the compiler to implement correctly.
+	panic("internal/abi.Escape: unimplemented")
+}
diff --git a/src/reflect/type.go b/src/reflect/type.go
index 828cf12e27..884f89dc84 100644
--- a/src/reflect/type.go
+++ b/src/reflect/type.go
@@ -127,6 +127,11 @@ type Method struct {
 	Index int   // index for Type.Method
 }
 
+// IsExported reports whether the method is exported.
+func (m Method) IsExported() bool {
+	return m.PkgPath == ""
+}
+
 // The following Type type has been copied almost entirely from
 // https://github.com/golang/go/blob/go1.15/src/reflect/type.go#L27-L212.
 // Some methods have been commented out as they haven't yet been implemented.
diff --git a/src/runtime/time.go b/src/runtime/time.go
index 3935b4486e..23a9bf5e2f 100644
--- a/src/runtime/time.go
+++ b/src/runtime/time.go
@@ -46,3 +46,9 @@ func timerCallback(tn *timerNode, delta int64) {
 		addTimer(tn)
 	}
 }
+
+//go:linkname time_runtimeIsBubbled time.runtimeIsBubbled
+func time_runtimeIsBubbled() bool {
+	// We don't currently support bubbles.
+	return false
+}