diff --git a/modules/nf-core/wittyer/Dockerfile b/modules/nf-core/wittyer/Dockerfile
index 3955699c92d..6d6565a7aa4 100644
--- a/modules/nf-core/wittyer/Dockerfile
+++ b/modules/nf-core/wittyer/Dockerfile
@@ -1,11 +1,11 @@
-FROM mcr.microsoft.com/dotnet/sdk:6.0 as builder
+FROM mcr.microsoft.com/dotnet/sdk:8.0@sha256:02fdc848bbda5d57d9211a72c99bd665b421206002d66b8bc2cc0b2297c227fa as builder
 WORKDIR /src
 COPY . /src
 RUN cd Wittyer \
     && dotnet publish -f net6.0 -r linux-x64 -c Release -o /output \
     && chmod +x /output/Wittyer
 
-FROM mcr.microsoft.com/dotnet/runtime:6.0
+FROM mcr.microsoft.com/dotnet/runtime:8.0@sha256:47e0bc724479c8e4cf7b164b57e87da8a02f22a8e236b9b5b469d1ffd20fbe84
 LABEL git_repository=https://git.illumina.com/DASTE/Ilmn.Das.App.Wittyer.git
 WORKDIR /opt/Wittyer
 RUN apt-get -y update && apt-get -y install tabix libunwind8 openssl procps