diff --git a/.circleci/config.yml b/.circleci/config.yml
index e8654f3e9f..563c965dfc 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -105,7 +105,7 @@ jobs:
     # This tests the latest supported LLVM version when linking against system
     # libraries.
     docker:
-      - image: golang:1.25-bullseye
+      - image: golang:1.26rc2-bookworm
     steps:
       - test-linux:
           llvm: "20"
diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index 1ff0be8def..c206f80c85 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -40,7 +40,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-rc.2'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v4
@@ -135,7 +135,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-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 d5a6619fbc..f7dee9f938 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:1.25-alpine
+      image: golang:1.26rc2-alpine
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
@@ -40,7 +40,7 @@ jobs:
       - name: Cache Go
         uses: actions/cache@v4
         with:
-          key: go-cache-linux-alpine-v1-${{ hashFiles('go.mod') }}
+          key: go-cache-linux-alpine-v2-${{ hashFiles('go.mod') }}
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
@@ -48,7 +48,7 @@ jobs:
         uses: actions/cache/restore@v4
         id: cache-llvm-source
         with:
-          key: llvm-source-20-linux-alpine-v1
+          key: llvm-source-20-linux-alpine-v2
           path: |
             llvm-project/clang/lib/Headers
             llvm-project/clang/include
@@ -73,7 +73,7 @@ jobs:
         uses: actions/cache/restore@v4
         id: cache-llvm-build
         with:
-          key: llvm-build-20-linux-alpine-v1
+          key: llvm-build-20-linux-alpine-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -97,7 +97,7 @@ jobs:
         uses: actions/cache@v4
         id: cache-binaryen
         with:
-          key: binaryen-linux-alpine-v1
+          key: binaryen-linux-alpine-v2
           path: build/wasm-opt
       - name: Build Binaryen
         if: steps.cache-binaryen.outputs.cache-hit != 'true'
@@ -137,7 +137,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-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@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-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@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-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 60b0d8cb5d..91c2e8954d 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -41,7 +41,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-rc.2'
           cache: true
       - name: Restore cached LLVM source
         uses: actions/cache/restore@v4
@@ -94,7 +94,7 @@ jobs:
       - name: Cache Go cache
         uses: actions/cache@v4
         with:
-          key: go-cache-windows-v1-${{ hashFiles('go.mod') }}
+          key: go-cache-windows-v2-${{ hashFiles('go.mod') }}
           path: |
             C:/Users/runneradmin/AppData/Local/go-build
             C:/Users/runneradmin/go/pkg/mod
@@ -147,7 +147,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-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@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-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@v6
         with:
-          go-version: '1.25.5'
+          go-version: '1.26.0-rc.2'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v4
diff --git a/Dockerfile b/Dockerfile
index 4901581a02..519d1382fc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.25 AS tinygo-llvm
+FROM golang:1.26rc2 AS tinygo-llvm
 
 RUN apt-get update && \
     apt-get install -y apt-utils make cmake clang-17 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:1.25 AS tinygo-compiler
+FROM golang:1.26rc2 AS tinygo-compiler
 
 # Copy tinygo build.
 COPY --from=tinygo-compiler-build /tinygo/build/release/tinygo /tinygo