diff --git a/pkgs/servers/dict/dictd-db-collector.nix b/pkgs/servers/dict/dictd-db-collector.nix
index a0ad507c4664..793cbf66a46d 100644
--- a/pkgs/servers/dict/dictd-db-collector.nix
+++ b/pkgs/servers/dict/dictd-db-collector.nix
@@ -1,4 +1,4 @@
-{ stdenv, lib, dict }:
+{ stdenv, lib, dict, libfaketime }:
 ({ dictlist, allowList ? [ "127.0.0.1" ], denyList ? [ ] }:
 
 /*
@@ -56,7 +56,8 @@ let
         ln -s "$i".dict.dz
       else
         cp "$i".dict .
-        dictzip "$base".dict
+        source_date=$(date --utc --date=@$SOURCE_DATE_EPOCH "+%F %T")
+        faketime -f "$source_date" dictzip "$base".dict
       fi
       ln -s "$i".index .
       dictfmt_index2word --locale $locale < "$base".index > "$base".word || true
@@ -76,6 +77,7 @@ in
 stdenv.mkDerivation {
   name = "dictd-dbs";
 
+  nativeBuildInputs = [ libfaketime ];
   buildInputs = [ dict ];
 
   dontUnpack = true;
diff --git a/pkgs/servers/dict/dictd-wordnet.nix b/pkgs/servers/dict/dictd-wordnet.nix
index 663bd54897bf..d9f3c7a99c8c 100644
--- a/pkgs/servers/dict/dictd-wordnet.nix
+++ b/pkgs/servers/dict/dictd-wordnet.nix
@@ -1,10 +1,10 @@
-{lib, stdenv, python3, wordnet, writeScript}:
+{lib, stdenv, python3, wordnet, writeScript, libfaketime}:
 
 stdenv.mkDerivation rec {
   version = "542";
   pname = "dict-db-wordnet";
 
-  buildInputs = [python3 wordnet];
+  buildInputs = [python3 wordnet libfaketime];
   convert = ./wordnet_structures.py;
 
   builder = writeScript "builder.sh" ''
@@ -16,7 +16,8 @@ stdenv.mkDerivation rec {
       DATA="$DATA `echo $i | sed -e s,data,index,` $i";
     done
 
-    python ${convert} $DATA
+    source_date=$(date --utc --date=@$SOURCE_DATE_EPOCH "+%F %T")
+    faketime -f "$source_date" python ${convert} $DATA
     echo en_US.UTF-8 > locale
   '';
 
diff --git a/pkgs/servers/dict/wiktionary/default.nix b/pkgs/servers/dict/wiktionary/default.nix
index b15ece0e8512..8ec15db4f319 100644
--- a/pkgs/servers/dict/wiktionary/default.nix
+++ b/pkgs/servers/dict/wiktionary/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, python3, dict, glibcLocales }:
+{ lib, stdenv, fetchurl, python3, dict, glibcLocales, libfaketime }:
 
 stdenv.mkDerivation rec {
   pname = "dict-db-wiktionary";
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "qsha26LL2513SDtriE/0zdPX1zlnpzk1KKk+R9dSdew=";
   };
 
-  nativeBuildInputs = [ python3 dict glibcLocales ];
+  nativeBuildInputs = [ python3 dict glibcLocales libfaketime ];
 
   dontUnpack = true;
 
@@ -17,8 +17,9 @@ stdenv.mkDerivation rec {
     mkdir -p $out/share/dictd/
     cd $out/share/dictd
 
-    ${python3.interpreter} -O ${./wiktionary2dict.py} "${src}"
-    dictzip wiktionary-en.dict
+    source_date=$(date --utc --date=@$SOURCE_DATE_EPOCH "+%F %T")
+    faketime -f "$source_date" ${python3.interpreter} -O ${./wiktionary2dict.py} "${src}"
+    faketime -f "$source_date" dictzip wiktionary-en.dict
     echo en_US.UTF-8 > locale
   '';